VB2 Plus Circuit Breaker User Manual
Contents
1. 3150A 40kA 1000mm Tables Unit 1250A 31 5kA 650mm 3150A 40kA 1000mm Width al mm 632 982 Height b mm 1031 1139 Depth c mm 747 735 Depth d mm 209 240 Internal Wiring Diagram Withdrawable type Spring Charge Motor Closing Circuit Breaker Interlock Circuit Opening Circuit Truck Interlock Circuit DO PA m al 44 f 58 l s9 22 53 ji W U PAR tuale dti AR ETA SO O NS NSN NASR S9 Limit switch service position CC Closing coil KO Anti pumping relay optional S8 Limit switch testing position TC Trip coil BC Electromagnet for locking optional S4 Electromagnet for locking s auxiliary switch M Spring Charge Motor ZC Electronegnet for locking truck optional S5 Auxiliary switch V1 V4 Rectitier S1 S3 Energy storing travel switch Note 1 This wiring diagram describes that a breaker is open racked to test position with spring in discharge state 2 The polarity in dashed frame should be connected to common DC voltage terminal 32. 61 2 8788 6911 F 61 2 8788 7224 Indonesia BRI Il Tower 27th floor JI Jend Sudirman No 44 46 Jakarta 10210 T 62 21573 0430 F 62 21574 7089 India The Millenia 6F Tower B 1 amp 2 Murphy Road Ulsoor Bangalore 560 008 T 9180 4143 4000 F 9180 4143 4199 HongKong 8F The Lee Gardens 33 Hysan Avenue Causeway Bay HongKong T 852 2100 6800 F 852 2376 0013 Japan 11F Akasaka Park Bldg 5 2 20 Akasaka Minato ku Tokyo 107 0052 T 81 3 5544 6780 F 481 3 3589 3372 Korea 3F GE Tower 71 3 Chungdam Dong Kangnam Gu Seoul 135 100 T 82 2 6201 4501 F 82 2 6201 4545 Malaysia Level 6 1 Sentral Jalan Travers Kuala Lumpur 50470 T 603 2273 9788 F 603 2273 3481 New Zealand Level 1 8 Tangihua Street Auckland North Island T 64 9 353 6706 F 64 9 353 6707 Philippines 8F Net Cube Building 30th Street Corner 3rd Avenue Crescent West Park Global City Taguig 1634 T 63 2 877 7000 F 63 2 846 0629 Singapore 240 Tanjong Pagar Road 06 00 GE Tower Singapore 088540 T 65 6326 3404 F 65 6326 3015 Taiwan 6F No 8 Sec 3 Minsheng E Road Taipei 10480 T 886 2 2183 7000 F 886 2 2516 6829 Thailand 7th Floor Capital Tower All Seasons Place 87 1 Wireless Road Lumpini Pathumwan Bangkok 10330 T 66 2 648 0199 F 66 2 648 0100 Vietnam Saigon Centre Unit 1 Floor 7 Le Loi Boulevard District 1 HoChiMinh city Tel 84 8 3914 6700 Fax 84 8 3
3. Rectifier will be removed if DC is applied Fixed type Spring Charge Motor Closing Circuit Breaker Interlock Circuit Opening Circuit SRA A T T TITTIITTTTI v2 V4 V3 K lt KI cc VI KO a er TC 14 52 o tane soi 163 73 U 11 91 131 141 11 3061 63 423 733 83 93 52 S5 n 74 S5 2 gt gt 92 32 w2 Va n Fa 24 75 84 la S5 5 po l q ko 3 21 13 d 21 22153 14153 29 S1 DG G Qe Oe sd OC OC DC OIC OC Q E OLC G QG 8 G 8 G ole DO DO YE 21 43 13 va 81 22 S5 44 S5 14 5 82 55 aa Q Q S4 Electromagnet for locking s auxiliary switch CC Closing coil KO Anti pumping relay optional S5 Auxiliary switch TC Trip coll BC Over current release coilloptional S1 S3 Energy storing travel switch M Energy storing motor ZC Electromagnet for locking optional V1 V4 Rectifier C control Note 1 This wiring diagram describes that a breaker is uncharged and is in an opening state 2
4. condition is reinstated The dielectric strength of the interrupter also increases and the current is interrupted When the contacts in the open position the circuit voltage is withstood internally by the inter contact gap and externally by the insulating envelope Operating mechanism Charging operation The energy that is necessary for closing the circuit breaker is provided by the closing spring The energy storage can be operated by motor or by the manual charging handle Spring charged by motor The spring charging mechanism consists of a spring charging motor gear wheel cam holder and closing spring When the energy storing motor 11 is charging the pinion of the output shaft 12 that is connected to motor will rotate which drives the gear wheel The holder fixed on the gear wheel will rotate the cam fixed on the shaft to move which then drives the shaft to rotate so that draws out the closing springs 17 for storing energy When the block on the gear wheel is pushed away the clutch is separated and the holder 4 will hold the roller on the cam 5 to keep the mechanism in charged thus the charging operation is completed Spring charged manually When Spring is charged by manual means you can just push the Spring charging handle on the mechanism up and down repeatedly to store the above mentioned spring charging process When the charging operation is complete you can hear strong cranking sound and the spring ch
5. moves upright which pushs the movable contact to the fixed contact with the required speed and then compresses the contact spring and causes contact travel to ensure the pressure is generated between movable and fixed contacts After the closing operation is finished the closing opening indicator 9 will indicate Close The power to the closing circuit will be removed If the external power supply is maintained the charging circuit will recharge the spring Interlocks The following interlock are incorporated to insure the safe operation of the breaker e When the breaker is in the closed condition the withdrawable circuit breaker racking between the service position and test position is not possible e When the earth switch is in close condition the withdrawable circuit breaker racking into the service position is not possible e When the withdrawable circuit breaker is in service position the earth switch can not be closed e When no voltage is applied to the interlock circuit then the breaker can not be closed Tripping operation When the breaker receives an opening command the opening pushbutton is pressed or the tripping coil 16 is energized the tripping shaft will rotate clockwise Under the action of opening spring 3 and contact wipe spring main shaft will move clockwise and the insulating rod 2 will make the movable contact separate from the fixed contact The buffer will absorb the residual energy and tripp
6. on o m 2 n Gu ee i n i NN 7 2 i Em i RI i nn l re gres 5 EEE es eee 7 nn AA gt ia Breaking Time ms 25 35 Closing Time ms 40 50 Control circuit data Table3 Motor Rated voltage V Normal operation voltage range Energy storing period under rated operation voltage s Input Power W 110 DC 85 110 lt 15s 150 220 AC 85 110 lt 15s 150 Table4 Coils Rated voltage Rated current Rated voltage Rated current Rated voltage Rated current Rated voltage Rated current RA AAA WAWA nA DC 24 233 _DC30 146 _DC36 15 DC48 8 4 AC110 2 2 AC 2200 11 4000A is VCB with force cooling 24V 30V plesse contact GE Overall Dimensions SecoVac VB2 Plus T630 1250A 25 31 5kA Phase to phase distance 150mm 280 1 637 Withdrawable Terminal section D 62 oe 5 Er M16 Depth 22mm I s amp vac LM N N A La 4 LM fi lt lo insara reg 5 l
7. value of water vapour pressure measured over a period of 24h does not exceed 2 2kPa The average value of the relative humidity measured over a period of one month does not exceed 90 The average value of water vapour pressure measured over a period of one month does not exceed 1 8kPa Seismic intensity is not more than Zone4 Service Conditions Special service conditions If the actual service conditions differ from the normal service conditions The circuit breaker and associating devices and auxiliary equipment shall be designed and made to comply with any special service conditions required by the user which must be discussed with GE in advance Normally the following special service conditions will be encountered e At sites with altitude above 1000m the effects of the reduction in dielectric strength of the air must be taken into account GE can supply circuit breakers which can be applied in areas less than 3000m above sea level At this time the insulation level in switchgears should be taken into account and must be discussed with GE in advance e The ambient temperature is above 40 C The service current of circuit breaker shall be derated at certain factor or fans shall be installed for heat dissipation Please confirm with GE in advance Attentation e When circuit breakers are operated in areas with high humidity and or major rapid temperature fluctuations there is a risk of condensation thus Put the circuit b
8. 827 8229 Printing Code 110104 B
9. GE Energy an ent SecoVac VB2 Plus Circuit Breaker User Manual GE imagination at work Safety Instruction Thank you very much for using SecoVac VB2 Plus type indoor MV vacuum circuit breaker referred to produced by Shanghai GE Breakers Co Ltd To help you install and operate this breaker safely and effectively please read this manual carefully and install operate and maintain it according to this manual as well as installation codes and operation procedures related to electrical equipment Precautions Delivery Please comply with the following precautions for your safety Upon reciept of the breakers the following inspection must be e Select the breaker according to operating conditions otherwise done it will result in faults such as damage to insulation short circuit dl ued as Sica at e Check that rated operating parameters of the breaker are not if possible photogroaphs of the affected units and notify GE exceeded during service immediately e Ensure that installation operation and maintenance are carried out only by qualified operators who have received relevant training The replacement of parts should be done by qualified electricians or GE service staff e Be sure that the breaker is open before it moves from test position to service position e The main circuit and control circuit must be deenergized during the maintenance and inspection the breaker must be drawn out of the switchgear and earth switch
10. The polarity in dashed frame should be consistent when the operation voltage is direct current Structure Overview The SecoVac VB2 Plus Vacuum circuit braaker uses a vacuum interrupter for the making and breaking of electric power circuit The movable primary cluster contacts on the breaker are connect with fixed primary contacts in switchgear and a secondary disconnectable plug connects with the secondary circuit of the switchgear The operating mechanism is equipped with spring compact charging mechanism The mechanism adopts modular design method and some parts have multiple functions Figure 1 Primary circuit 1 Upper arm 2 Embedded poles 3 Lowerarm 4 Cluster Operating mechanism Primary circuit The primary circuit is made up of cluster upper arms lower arms and embedded poles figure 1 The vacuum interrupters and main contact parts are embedded in epoxy resin using APG process which ensure the vacuum interrupters are protected from the ambient influence and mechanical damage Figure 2 Front facia of the circuit breaker 1 Tripping button 2 Status indicator for charging 3 Closing button 4 Counter 5 Indicator for openorclose 6 Charging handle The spring operating mechanism consists of a single module The operating mechanism is equipped with manual charging device which uses the charging handle and an electric charging device which charges the spring via a motor The mechanism has reclose function On the
11. aker is removed from the switchgear It is necessary that the circuit breaker is in open closing spring discharged and the power supply is cut off The replacement of the poles and operating mechanism should only be performed by GE authorized personnel Maintenance cycle Regular maintenance shall be carried out once in every 5 years or every 2000 operations of the circuit breaker under normal operating condition When there is any damaged insulation damaged element in the mechanism refusal refusal to open or close as well as other abnormal conditions maintenance inspection and testing shall be carried out The circuit breaker after 10000 times operation shall be replaced The circuit breaker after 25 years operation should be checked to determine whether it requires replacement Items checked during maintenance Operating mechanism Visual check of all elements and mechanical Interlocks for any damage If there is any damage please replace in time Check the tightening bolts and nuts and check the split pins for any breakage or falling loosening during operation Check the driving and friction positions inside the mechanism lubricant shall be applied to the moving and friction areas prior to installation Check the counter for correct operation Check and ensure the interlocks function Check the oil buffer for oil leakage or any other damage Check the auxiliary switch and position switch for terminals and contacts Check the mo
12. arging indicator 13 will show charged as well as the status of position switch 6 will cut the secondary supply to charging The operating mechanism is ready for the next operation Figure 3 17 16 15 14 13 12 i Figure3 1 Embeded pole 4 Holder 2 Insulating rod 5 Cam 3 Opening spring 6 Position switch 7 Ei HE co me p Mm en Ob Si 8 PE ja cin HB 9 n pl ER i rH I WA 10 11 Figure4 7 Closing coil 13 Charging indicator 8 Holder 14 Lock electromagnet 9 Close open indicator 15 Over current release 10 Main shaft 11 Motor 17 Closing spring 12 Output shaft 16 Tripping coil 10 11 Closing operation When the closing coil is energized the holder 4 will rotate counter clockwise to break away from the roller on the cam 5 The cam under the action of the force from closing spring 17 will perform clockwise rotation to push the roller on the main shaft which will cause the main shaft 10 to rotate counter clockwise The main shaft moves the connecting rod down through arm so that the insulating rod 2
13. closed Transport and Handling Loading unloading of the breaker units must only be carried out with either a crane if possible Do not lift circuit breaker by inserting fork lift or trolly ties directly under it Use a pallet or other support material between the circuit breaker and fork trolley Notes Avoid impact during handling Do not subject to the mechanical damage Important e Lifting breaker must not be attached to the breaker poles or parts of the operating mechanism Use lifting bores and lifting lugs Table1 The weight of circuit breakers Version Pole centre distance mm Rated current A Rated short circuit breaking current kA Weight kg Fixed 150 630 1250 31 5 115 En woe NE NEN WA DIE HERE RE nn NE VO E e l a F oe i ae a veni nn ee 1 cu Withdrawable 275 2500 4000 40 297 Contents UA eg NNO N aa Summary Tupe Spese NO nn Normal service conditions Special service conditions Storage TE EEE eg Oera DIS ra lidia ale WA DIO Merete TR TTAMAT rn nn A ee E u ee Overview Primary circuit Operating mechanism Working Principle anne Vacuum interrupter Operating mechanism ON AA NA ae RIE ee Documene Be ea eee ea ee ea en Introduction Summary The SecoVac VB2 Plus circuit breaker elaborately designed by GE Energy for three phases A C up to 17 5kV rated voltage and can be used for in controlling and protecting electrical equipment in
14. front facia of the circuit breaker there are Open Close Charged Discharged indicators and manual operating handle The operator can operate remotely by electric power or manual and the status of the circuit breaker can be observed on the front facia figure 2 The circuit breaker can be either opened or closed by the push buttons on the breaker or remotely via the closing coil and shut trip Table6 Indicators on the VB2 Plus circuit breaker Energy charged status indicator COMINO QUID The spring is charged Closing opening status indicator The circuit breaker is The circuit breaker is The spring is discharged O Manual closing amp tripping buttons Manual closing button close open Manual tripping button Working Principle Vacuum interrupter The vacuum pressure within the evacuated envelope of vacuum interrupter is less than 10 torr Under normal operating conditions the interrupter is closed Arcing is established within the interrupter by withdrawing the moving contact from fixed contact Arc burns in the metal vapor released from the contact surfaces The metal vapor continually leaves the inner contact region and recondenses on the contact surfaces and Surrounding metal vapor condensation shield The latter is usually isolated from both contacts and serves to protect the glass or ceramic envelope from vapor deposition At current zero vapor production ceases and the original vacuum
15. gt i l sa l a 450 gt 45 bo pen u Ben 443 en Fixed type Overall Dimensions SecoVac VB2 Plus T1250 4000A 40kA Phase to phase distance 275mm 310 1 29581 ma Withdrawable 794 27521 27521 FA L JA FI d am A f je l OE lO gt me OE BOE IO LI B Terminal section IM HEN 20mm ui 30 i m Ib sali a l __ H DJ E T 4 M12 O D e N gt O O O Sai tbe Y 34 5 275 118 B ll gt 788 al gt Fixed type SecoVac VB2 Plus L frame Dimension 1250A 31 5kA 650mm i 7 A
16. industrial mining power plants and substations applications The product conforms to IEC62271 100 The breaker can be installed in the switchgear in fixed or withdrawable arrangements It is the optimum choice for the control and protection of MV power systems Type SecoVac VB2 Plus I T LJ LI o o W Withdrawable F Fixed Rated short circuit breaking current kA 25 31 5 40 Service Conditions Normal service conditions Unless otherwise specified SecoVac VB2 Plus circuit breakers including the operating devices and the auxiliary equipment which form an integral part of them are intended to be used in accordance with their rated operating parameter and normal service conditions listed as follows The ambient air temperature does not exceed 40 C and its average value measured over a period of 24h does not exceed 35 C The minimum operating ambient air temperature is 15 C storage and transportation is allowed at 30 C The altitude does not exceed 1000m The ambient air is not significantly polluted by dust smoke corrosive and or flammable gases vapours or salt Rated current A 630 1250 1600 2000 2500 3150 4000 Forced cooling Spring operating mechanism Rated voltage 7 2kV 12kV 17 5kV SecoVac Series VB2 Plus type vacuum circuit breaker The conditions of humidity are as follows The average value of relative humidity measured over a period of 24h does not exceed 95 The average
17. ing operation is completed After the tripping operation is finished The closing opening indicator 9 will indicate open Meanwhile the counter will record the operation Reclosing Auto Reclosing When the circuit breaker is in the closed condition the mechanism can be charged and ready to close so that the circuit breaker can reclosed immediately after tripping Anti Pumping When an attempt to close the breaker has been made if the breaker doesn t successfully close then internal closing circuit of the breaker must be tripped with anti pumping relay Installation Correct installation is of primary importance the manufacturer s instructions must be fully complied with to ensure safe and reliable operation It is good practice to wear gloves for handling the breaker during the installation Please carry out installation and wiring of this breaker according to this manual Don t place tools or other objects on the breaker during installation Wear appropriate personal protective equipment and safe lifting procedure Check before installation After the breaker is unpacked check the breaker poles for any cracks and breakage The product nameplate and product certificate shall conform with the order Check goods according with the packing list Clean the insulating parts with a clean dry cloth Check the upper and lower terminals are clean and free of any deformation caused by shocks received during transport or storage Chec
18. ipping coil refuse to act Electrical Measure the operating voltage and adjust the voltage Mechanical Indicator for position falls Motor doesn t act The motor can t stop The breaker can not open manually The secondary circuit wiring has fault Bad contact of the auxiliary switch Too low voltage for closing The terminal connection of the secondary wiring _ becomes loose disconnected The withdrawable part is not in service position ii Or test position Overtravel too high The coil has burned out The secondary wiring is fault Bad contact in auxiliary switch Secondary operating voltage too low The Tripping coil act but the breaker doesn t open The terminal connection of the secondary wiring becomes loose The withdrawable part is not in service position and test position S8 and S9 auxiliary switch fails or the withdrawable deforms The secondary wiring open or the motor burns out Wiring or position switch failure Action Replace the coil Connect the wirings again and confirm Check and replace Measure the closing voltage and ensure it is within limit reconnect Adjust the overtravel to the specified limit Conform the position of withdrawable part in service position or test position Replace the coil Check wiring and tighten the terminals Check the auxiliary and replace Check wiring and tighten the terminal Conf
19. k the vacuum interrupter through power frequency withstand voltage test Considerations 1 Operation for withdrawable circuit breakers e Put the circuit breaker into test position e Insert the handle and rotates the handle clockwise about 20 rotations While a strong cranking sound is heard the withdrawable circuit breaker will be in the service position don t apply too much force to avoid any damage Note Rotate anti clock wise to rack out 2 Operation for fixed circuit breakers e The careful and professional installation is a fundamental condition for the failure free operation of the circuit breaker e The circuit breaker installed in a switchgear cabinet shall not be subject to pulling amp compressing or deforming and the disc washers are needed e When connecting the main terminal don t cause the terminal to deform e When connecting the bus bar the depth of the bolt must comply with requirement of drawings e Use the standard bolts with strength of Class 8 8 and the disc springs to tighten the bus bar Table 7 e The circuit breaker installed in a switchgear cabinet shall comply with IP2X requirements when switchgear circuit breaker door opening e Provide insulator to support on busbar on less than 250mm position away from pole terminal Table7 Tightening torque of bolts Basic dimensions of Tightening torque without Commissioning e All commissioning and operation work shall be carried out bU persons who ha
20. l al jid mama a jal rs Figure 9 Figure 10 Lubrication VB2 Plus circuit breaker has a mechanical operation service life time is 10000 times After each 2000 operations lubrication is Necessary The following type of the lubrication is recommended Mobilux EP Series e Silicone grease 102 Documents and Accessories Accompanuing documents e Product certificate e Manual e Packing list spare parts Accessories e Withdrawable part Racking handle Some of the following spare parts are available For ordering please contact GE Description Auxiliary switch F10 18 Auxiliary switch GDF 5 Opening coil Closing coil Micro Position switch Energy charge motor Counter P BUFFER 1 piece per set Oil buffer Control wiring board 1 piece per set Electromagnet for locking Electromagnet for locking truck Remarks GDF5AA00 1 piece per set 1 TA rsE f ecs gt niece per se ion une BONE AA Er TORNA KUA WAMA MUWE A E 2 atado P Motor 1 piece per set 1 piece per set 1 piece per set 1 piece per set 16 GE Energy GE Asia Headquarters China 4F Building 2 CTP No 1 Hua Tuo Rd Zhang Jiang Hi Tech Park Pudong Shanghai 201203 T 86 21 3877 7888 F 86 21 3877 7600 GE Breakers Co Ltd 865 Nangiao Road Fengxian District ShangHai 201400 China T 86 21 6710 1900 F 86 21 6710 1901 Australia 125 127 Long Street Smithfield Sydney NSW 2164 T
21. orm the position of withdrawable part in service position and test position Replace the auxiliary switch or repair the withdrable part by manufacturer Check the wiring or replace the motor Check the wiring or replace the position switch 14 Dismantling and Installation of Components and Parts The pole and closing amp tripping modules shall be replaced by GE service technicians The replacement of the parts should be in accordance to this manual Dismantling and installation of tripping amp closing coils As shown in figure 7 disconnect the secondary wire 1 of closing amp tripping coils and unscrew the bolts at both sides Take out the support bracker of the tripping amp closing coils and take off the coils The installation process is in the reverse order Removal and installation of counters As shown in figure 8 remove spring 2 and turn off screw 1 the counter can be removed The installation procedure is in the reverse order Figure 8 Removal and installation of auxiliary switch Ensure all control supply is disconnected As shown in figure 9 remove the link 2 and remove the bolt 1 Take off the auxiliary switch and the secondary wiring as required Removal and installation of position switch As shown in figure 10 firstly remove the secondary wiring 1 and remove the bolt 2 then remove the position switch The installation procedure is in the reverse order BITTE METE il
22. reaker into operation as soon as possible after the package is dismantled Put on the heater into service as soon as possible after the switchgear is installed Please consult GE special application conditions storage e The product is applicable to normal transportation conditions i e highway floor above level 3 and pay attention to waterproofing e Do not store product other than as indicated on packaging Damage is possible if stored on side back or top e If immediate installation is not possible basic package is required or original package is maintained After inspection and stored the circuit breaker should be switched off and the spring mechanism should be discharged e The product shall be stored in dry and ventilated indoor place free of dust severe contamination chemical corrosion and vibrations The climate condition conforms to related specifications in IEC 62271 1 and adequate air circulation shall be maintained The store room temperature shall not be lower than 30 C Check periodically to avoid condensation inside breaker Technical Data Electrical Parameter Table2 Rated Voltage kV 3 3 12 15 17 5 Rated Current A _2500 3150 4000 2500 3150 4000 2500 3150 4000 ja NN OF E N lt a TT Ta Rated Peak Withstand Current ka 65 82 104 65 82 104 65 82 104 Rated Peak Making Current KA 65 82 104 65 82 104 65 82 104 Electrical Endurance No of Times E2 DE a ra a E gt n A E _ A a y Sen nn
23. tor Check the closing tripping and latch coils Check the terminals of secondary circuit Check for loose parts and re tighten Check the withdrawable part Check the holders pins and terminals Pay attention to apply lubricant grease and tightening terminals Racking operation check and ensure the functions work properly The primary circuit Check and clean the pole insulation and check the bolts for tightness to ensure good contact Measure the clearance and over travel of the circuit breaker Carry out mechanical operating test to the circuit breaker by closing and opening 5 times respectively at rated operating voltage high voltage and low voltage Carry out mechanical characteristics test to the circuit breaker Measure the opening and closing time average speed asunchronism bouncing time etc Tighten the bolts and measure the resistance of main circuit Measure the insulation resistance of the main circuit Carry out power frequency withstand voltage test The bolts applied in maintenance should be applied with anaerobic adhesive prior to installation The test for mechanical characteristics The value for mechanical characteristics should conform to technical data list Maintenance Trouble shooting Table 8 Refuse to close Refuse to open Others Trouble Cause The coil has burned out The closing coil refuse to act Electrical The closing coil act but the breaker dosen t close The Tr
24. ve received suitable training and understand the performance of the circuit breaker Correct protective and preventive measures shall be taken during commisioning e Using the product under normal working conditions and within the range of technical data according to the standard of IEC 62271 1 which will ensure the correct performance of the circuit breaker e After the installation of the circuit breaker into switchgear the breaker shall not be subject to any excessive stress Preparation work Prior to energization e Check the circuit breaker for any damage or any other dangerous environmental influence e Clean the dirt on the surface of insulator e The lifting hook of the circuit breaker must be removed prior to operation e Check the connecting status of the primary and secondary circuits as well as the earthing e Follow spring charging opening and closing operations manually ensure the breakers is operated properly Operation e For detailed operations please refer to the working principle of the mechanism Please check the status of the circuit breaker carefully prior to operation Tightening torque with lubricant applied N m bolts mm lubricant applied N m M8 25 10 breaker position indicator will show the breaker in service position 12 13 Maintenance Maintenance rules The user shall not replace any parts with different maker to original parts Prior to maintenance make sure that the circuit bre
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