Eaton AMH-4.76-VR Instruction Book
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Eaton AMH-4.76-VR Instruction Book

Eaton AMH-4.76-VR Instruction Book

Replacement circuit breaker
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Instruction Book IB182023EN
AMH-4.76-VR
Replacement Circuit Breaker
Supercedes October 2013
Effective
March 2016
AMH-4.76-VR 4.76 1200A Shown

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Summary of Contents for Eaton AMH-4.76-VR

  • Page 1 Supercedes October 2013 Instruction Book IB182023EN Effective March 2016 AMH-4.76-VR Replacement Circuit Breaker AMH-4.76-VR 4.76 1200A Shown...
  • Page 2 SHALL NOT BECOME PART OF OR MODIFY ANY CONTRACT BETWEEN THE PARTIES. In no event will Eaton be responsible to the purchaser or user in contract, in tort (including negligence), strict liability or other-wise for any special, indirect, incidental or consequential damage or loss whatsoever, including but not limited to damage or loss of use of equipment, plant or power system, cost of capital, loss of power, additional expenses in the use of existing power facilities, or claims against the purchaser or user by its customers resulting from the use of the information, recommendations and descriptions contained herein.

  • Page 3: Table Of Contents

    SECTION 5: INSPECTION & INSTALLATION 1.1 VISUAL INSTRUCTION BOOKLET ESSENTIALS 5.1 EXAMINATION FOR DAMAGE 1.2 QUICK RESPONSE CODE 5.1.1 NAMEPLATE VERIFICATION 1.3 AVAILABLE AMH-4.76-VR CIRCUIT BREAKERS 5.2 SURE CLOSE MECHANISM ADJUSTMENT 5.3 MANUAL OPERATION CHECK SECTION 2: SAFE PRACTICES 5.4 VACUUM INTERRUPTER INTEGRITY SECTION 3: RECEIVING, HANDLING, AND STORAGE 5.5 LOW FREQUENCY WITHSTAND...

  • Page 4: Section 1: Introduction

    FOR LONG USEFUL LIFE OF THE CIRCUIT BREAKERS. IT IS FURTHER and provide equal or superior electrical and mechanical performance RECOMMENDED THAT THE INSTALLATION BE PERFORMED BY A EATON as compared to the design ratings of the original circuit breaker.
  • Page 5 AMH-4.76-VR Replacement Circuit Breaker Tablt 2. AMH-4.76-VR Dimtnsions Existing Breaker Rated Continuous Current at 60 Hz Breaker Type (Amps) AMH-4.76-VR 250/250U 1200 / 2000 56.02 23.44 7.00 44.42 40.07 7.50 18.38 26.50 8.50 42.00 Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 6: Section 2: Safe Practices

    Always rtmovt tht mainttnanct tool from tht brtaktr afttr • charging tht closing springs. Brtaktrs art tquipptd with saftty inttrlocks. Do not dtftat • thtm. This may rtsult in dtath, bodily injury or tquipmtnt damagt. Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 7: Section 3: Receiving, Handling, And Storage

    Stand a and other components. File claims immediately with the carrier if safe distance away from the breaker while lifting and moving. damaged or loss is detected and notify the nearest Eaton’s Electrical Services & Systems office. Figurt 3.2. Lifting AMH-4.76-VR...

  • Page 8: Amh-4.76-Vr Approximate Weights

    AMH-4.76-VR Replacement Circuit Breaker 3.3 STORAGE 3.4 AMH-4.76-VR APPROXIMATE WEIGHTS If the circuit breaker is to be placed in storage, maximum protection Refer to Table 3. can be obtained by keeping it in the original shipping crate. Before placing it in storage, checks should be made to make sure that the breaker is free from shipping damage and is in satisfactory operating Tablt 3.
  • Page 9 AMH-4.76-VR Replacement Circuit Breaker Figurt 3.3. Front Exttrnal Vitw of AMH-4.76-VR Front External View Manual Charging Socket Guide Bar MOC Actuator Push To Close Button Breaker Contacts Indicator Push To Open Button Racking Access Door Springs Charge/Discharge Position Indicator Foot Pedal...
  • Page 10 AMH-4.76-VR Replacement Circuit Breaker Figurt 3.4. Rtar Exttrnal Vitw of AMH-4.76-VR Rear External View Shutter Actuator SURE CLOSE Spring Secondary Disconnect Primary Disconnect Guide Rail Ground Contact Racking Screw Racking Access Door Interlock Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 11: Section 4: Description And Operation

    The purpose of the contact erosion indicator is to monitor the erosion of the vacuum interrupter contacts, which is very minimal over time with Eaton vacuum interrupters utilizing copper-chrome contact material. A contact erosion indicator mark is located on the moving stem of the interrupter (Figure 6.1 and 6.2).

  • Page 12: Contact Wipe And Stroke

    The mechanism the ratchet wheel and will not result into advance of charging. may rest in any one of the four positions shown in Figure 4.6 as follows: Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 13: Closing Operation

    The racking Y/b contact opens the SR circuit, so that even though the breaker would subsequently open, it could not be reclosed before CS/C was released and remade. This is the anti-pump function. Instruction Book IB182023EN March 2016 www.eaton.com...
  • Page 14 Protective Relay Open in all except between ‘Test’ ‘C’ and ‘NO’ Brown Switch Terminal Block or Accessible Terminal and’Connect’ positions Position Switch 1 Position Switch 2 Closed in all except between ‘Test’ and ‘Connect’ positions Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 15: Miscellaneous Items

    TO THE ASSOCIATED MECHANICAL FORCE. CONTACT WITH THE MOC OPERATOR DURING OPERATION COULD RESULT IN INJURY. 4.8.2 OPERATIONS COUNTER All AMH-4.76-VR breakers are equipped with a mechanical operations counter (Figures 3.3). As the breaker opens, the linkage connected to the pole shaft lever advances the counter reading by one.
  • Page 16 LH Closing Spring Spring Release Assembly Manual Charge Socket Motor Cutoff Switch Shunt Trip Assembly Ratchet wheel Latch Check Switch (Rear) RH Closing Spring Operations Counter Closing Cam Reset / Opening Spring Charging Motor Instruction Book IB182023EN March 2016 www.eaton.com...
  • Page 17 Cam Shaft Spring Release (Close) Clapper Closing Spring Spring Release Latch (Close Roller) Spring Release (Close) Coil Holding Pawl (Electrical Charging) / Drive Pawl (Electrical Charging) / Drive Pawl (Manual Charging) Holding Pawl (Manual Charging) Instruction Book IB182023EN March 2016 www.eaton.com...
  • Page 18 4.9.d. Breaker Closed and Closing Spring Charged Charging Schematic Main Link Roller Closing Cam Trip Bar “D” Shaft Main Link Cam Shaft Trip Latch Reset Spring Operating Rod Banana Link Shunt Trip Lever Pole Shaft Trip latch Shunt Trip Coil Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 19: Section 5: Inspection & Installation

    Verify the information on the new VR-Series nameplate matches proceed with the following steps to increase the breaker force: the information on the purchase order. If any discrepancies exist, notify Eaton’s Electrical Services & Systems for resolution prior to proceeding.  WARNING MEASUREMENTS AND ADJUSTMENTS SHOULD NEVER BE ATTEMPTED ...

  • Page 20: Manual Operation Check

    It is preferred that this check be made with the breaker in the Test position in the breaker compartment. Since the Type AMH-4.76-VR Circuit Breaker is for use in existing AMH Metal-Clad Switchgear, installation procedures are similar. If it is necessary to reference anything in the breaker compartment, refer to the original instruction books supplied with the assembly.

  • Page 21: Description Of Operational Positions

    5.9 DESCRIPTION OF OPERATIONAL POSITIONS Figurt 5.4. AMH-VR in tht Ttst Position This section of the instructional manual covers the AMH line of Eaton vacuum replacement breakers. The AMH-4.76-VR has four basic operational positions: (1) Breaker withdrawn from the cell.

  • Page 22: Removal Procedure

    If the breaker is to be withdrawn, press the interlock pedal while pulling the breaker out of the cell using the handles on the front of the breaker. (Figure 3.3) Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 23: Section 6: Inspection & Maintenance

    Test 6.8.1 If < 0.6 Contact P.B.C. ™ ™ At 1-877-276-9379 BOLT SIZE 8 - 32 10 - 32 .25 - 20 .31 - 18 .38 - 16 .50 - 13 TORQUE Lb. In. Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 24: Vacuum Interrupter Integrity Test

    INTERRUPTERS BECAUSE THE PEAK VOLTAGE APPEARING ACROSS THE INTERRUPTERS CAN BE SUBSTANTIALLY GREATER THAN THE VALUE READ ON THE METER. Vacuum Interrupter Integrity Test Voltage Breaker Rated Maximum Voltage AC 60Hz Up to and including 15.0 kV 27 kV 40 kV Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 25: Insulation

    1125 RMS, 60 Hz. Maintain the voltage for “T” Shape Indicator Not Visible one minute. Successful withstand indicates satisfactory insulation “Wipe” Unsatisfactory strength of the secondary control circuit. Remove the shooting wire and reconnect the motor leads. Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 26: Primary Circuit Resistance Check

    Factory Field Factory on Eaton Electrical experience and judgment, but should not be considered to be all-inclusive or covering every application or Resistance correction for temperature based from the circumstance which may arise. If further information is required, you conversion factory resistance measurement.
  • Page 27 - consult the factory. Sttp 15 - Reassemble the front cover onto the circuit breaker. Return the circuit breaker to its original configuration and setup. Figurt 6.7. Attaching CloSurt™ Ttst Tool at Holt “A” & “B” Instruction Book IB182023EN March 2016 www.eaton.com...
  • Page 28 Ltft and Right Figurt 6.9. Makt a Cltar and Htavy Mark ® Figurt 6.10. With Marktr in Holt “C” , Whilt Closing Brtaktr Figurt 6.13. Top vitw of Cam and Marktr Inttrfact CloSure Tool Marker Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 29: Lubrication

    Figurt 6.14. Evaluatt tht CloSurt™ Ptrformanct All parts that require lubrication have been lubricated during the assembly with molybdenum disulphide grease. Eaton No. 53701QB. Over a period of time, this lubricant may be pushed out of the way or degrade. Proper lubrication at regular intervals is essential for maintaining the reliable performance of the mechanism.
  • Page 30 • Control Power (CS/T Switch, remains made) Mechanism • Trip Coil Clapper (Not Resetting) • Trip Bar or Trip Latch (Poor Engagement Of Mating Or Worm Surfaces) • Trip Bar Reset Sprint (Loss Of Torque) Instruction Book IB182023EN March 2016 www.eaton.com...

  • Page 31: Section 7: Replacement Parts

    Each customer should develop his own level based on operating experience. However, when c. Send all orders or correspondence to the nearest Eaton sales establishing a new operating record, it is a good practice to stock office or contact the PBC direct at 1-877-276-9379.
  • Page 32 Eaton 1000 Eaton Boulevard Cleveland, OH 44122 United States Eaton.com © 2013 Eaton All Rights Reserved Eaton is a registered trademark. Printed in USA Publication No. IB182023EN All trademarks are property March 2016 of their respective owners.

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