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Instruction Book    

IB182923EN   September 2018   www.eaton.com

AMH-4.76-VR

+

VR-Series

 Replacement Circuit Breaker

SECTION 1:   INTRODUCTION

This instruction booklet provides information on receiving and 

handling, storage, installation, operation and maintenance of the 

AMH-4.76 VR-Series

+

 vacuum replacement circuit breaker. The 

Vacuum Replacement circuit breakers (also referred to as VR-Series

+

are designed to be used in existing General Electric type AMH 

metal-clad switchgear. The VR-Series

+

 circuit breakers provide 

superior electrical and mechanical performance as compared to 

the design ratings of the original circuit breaker. VR-Series

+

 Circuit 

breakers provide reliable control, protection and performance, with 

ease of handling and maintenance. Like ratings of the VR-Series

+

 

circuit breakers are interchangeable.
The VR-Series

+

 circuit breaker element offers:

• 

10-year or 10,000 operation scheduled maintenance intervals.

 

When applied in “usual service conditions” as defined by IEEE 

C37.04-1999, the VR-Series

+

 circuit breaker element requires 

maintenance only once every ten years or ten thousand 

operations, which ever comes first.

otte:

N

See Inspection & Maintenance section in this booklet for details.

• 

Increased mechanical endurance.

 Circuit breakers in repetitive 

duty applications offer 50% more operations over conventional 

vacuum circuit breaker elements before parts replacement may 

be needed.

• 

Increased short circuit capability.

 The VR-Series

+

 circuit breaker 

short circuit capability can be increased to 41 kA, provided a bus 

bracing study is performed and the switchgear is adequately 

braced to meet the requirements per IEEE C37.59.

Use this instruction bulletin in conjunction with the technical 

information provided with the original equipment order which 

includes electrical control schematic and wiring diagrams, outline 

diagrams, installations plans, and procedures for installation and 

maintenance of accessory items.
Satisfactory performance is dependent on proper application, correct 

installation, and adequate maintenance. It is very important that 

this installation and maintenance instruction booklet be read and 

followed closely to achieve optimum performance and a long useful 

circuit breaker life in its application.

1.1   VISUAL INSTRUCTION BOOKLET ESSENTIALS

Eaton provides additional documentation designed to enhance the 

technical information provided in this instruction booklet for the 

VR-Series circuit breakers. The Visual Instruction Booklet Essentials 

(VIBE) is a digital supplemental booklet featuring user interactive 

content and informative videos intended to assist with the 

maintenance of the VR-Series circuit breaker. The VIBE document is 

available for immediate download at www.eaton.com/VR-Series.

1.2   QUICK RESPONSE CODE

VR-Series circuit breakers have a quick response code (QR Code) on 

the escutcheon of the circuit breaker cover. This QR Code is a matrix 

barcode that provides direct access to download VR-Series specific 

documentation, such as product instruction booklets and the VIBE 

documentation. See Figure 1.1 for the featured VR-Series QR Code.

otte:

N

A smart phont with an adtquatt QR Codt Scanntr application 

must bt ustd. Downloading conttnt may incur data chargts from tht 

mobilt strvict providtr. 

m

 WARNING

SATISFACTORY PERFORMANCE OF THESE BREAKERS IS CONTINGENT 

UPON PROPER APPLICATION, CORRECT INSTALLATION AND ADEQUATE 

MAINTENANCE. THIS INSTRUCTION BOOK MUST BE CAREFULLY READ 

AND FOLLOWED IN ORDER TO OBTAIN OPTIMUM PERFORMANCE 

FOR LONG USEFUL LIFE OF THE CIRCUIT BREAKERS. IT IS FURTHER 

RECOMMENDED THAT THE INSTALLATION BE PERFORMED BY A EATON 

CORPORATION TRAINED ENGINEER OR TECHNICIAN.

VR-SERIES BREAKERS ARE PROTECTIVE DEVICES, AS SUCH, THEY ARE 

MAXIMUM RATED DEVICES. THEREFORE, THEY SHOULD NOT UNDER ANY 

CIRCUMSTANCE BE APPLIED OUTSIDE THEIR NAMEPLATE RATINGS.

ALL POSSIBLE CONTINGENCIES WHICH MIGHT ARISE DURING 

INSTALLATION, OPERATION, OR MAINTENANCE, AND ALL DETAILS 

AND VARIATIONS OF THIS EQUIPMENT ARE NOT COVERED BY THESE 

INSTRUCTIONS. IF FURTHER INFORMATION IS DESIRED BY THE 

PURCHASER REGARDING A PARTICULAR INSTALLATION, OPERATION, OR 

MAINTENANCE OF THIS EQUIPMENT, THE LOCAL EATON REPRESENTATIVE 

SHOULD BE CONTACTED.

1.3   AVAILABLE AMH-4.76-VR+ CIRCUIT BREAKERS

Refer to Table 1.

Figurt 1.1. Quick Rtsponst Codt

VR-Series QR Code

Summary of Contents for AMH-4.76-VR+

Page 1: ...September 2018 Instruction Book IB182923EN AMH 4 76 VR VR Series Replacement Circuit Breaker Effective AMH 4 76 VR 1200A Shown...

Page 2: ...f further information is required an Eaton sales office should be consulted Sale of the product shown in this literature is subject to the terms and conditions outlined in appropriate Eaton selling po...

Page 3: ...NTERLOCKS 14 4 7 1 ANTI CLOSE INTERLOCK 14 4 7 2 RACKING SYSTEM TRIP AND SPRING RELEASE INTERLOCKS 14 4 7 3 ACTIVE INTERLOCK 15 4 7 4 SHUTTER INTERLOCK 15 4 8 MISCELLANEOUS ITEMS 15 4 8 1 OPERATIONS C...

Page 4: ...important that this installation and maintenance instruction booklet be read and followed closely to achieve optimum performance and a long useful circuit breaker life in its application 1 1 VISUAL IN...

Page 5: ...ted Voltage Factor Rated Withstand ANSI Test Voltage Rated Short Circuit Maximum Sym Interrupting Capability Closing and Latching Momentary Capabilities kV MVA Amps K Low Freq kV RMS Impulse kV Peak I...

Page 6: ...R VR Series Replacement Circuit Breaker E H I G F J H D B C C A Table 2 AMH 4 76 VR Dimensions Breaker Type Existing Breaker Rated Continuous Current at 60 Hz Amps A B C D E F G H I J AMH 4 76 VR 250...

Page 7: ...injury and or property damage Do not work on a breaker with the secondary test coupler engaged Failure to disconnect the test coupler could result in an electrical shock leading to death personnel inj...

Page 8: ...ker Style 94C9506G01 Racking Handle The racking handle is used to drive the racking mechanism which moves the circuit breaker into and out of the cell The original OEM racking handle will interface wi...

Page 9: ...d indicator Push the manual trip button The breaker will trip as shown by the breaker contacts open green indicator After completing this initial check leave the closing springs discharged and breaker...

Page 10: ...ernal View of AMH 4 76 VR AMH 4 76 VR 250 1200A Shown Front External View 1 Manual Charging Socket 5 Guide Bar 9 Push to Open Button 2 Push To Close Button 6 Breaker Contacts Indicator 10 MOC Actuator...

Page 11: ...ment Circuit Breaker Figure 3 4 Rear External View of AMH 4 76 VR AMH 4 76 VR 250 1200A Shown Rear External View 1 Shutter Actuator 4 SURE CLOSE Spring 7 Secondary Disconnect 2 Primary Disconnect 5 Gu...

Page 12: ...R ASSEMBLY Each vacuum interrupter assembly also referred to as pole unit is assembled at the factory as a unit to assure correct dimensional relationships between working components Three interrupter...

Page 13: ...ND FINGERS AWAY FROM CIRCUIT BREAKER S INTERNAL PARTS WHILE THE CIRCUIT BREAKER CONTACTS ARE CLOSED OR THE CLOSING SPRINGS ARE CHARGED THE CIRCUIT BREAKER CONTACTS MAY OPEN OR THE CLOSING SPRINGS DISC...

Page 14: ...ct opens the SR circuit so that even though the circuit breaker would subsequently open it could not be reclosed before CS C was released and remade This is the anti pump function 4 5 1 TIMING The ope...

Page 15: ...ted by the circuit breaker shutter actuator that opens the shutter as the circuit breaker is racked into the circuit breaker compartment and closes the shutter as the circuit breaker is racked out of...

Page 16: ...pt between Test and Connect positions OPERATION C and NO C and NC C and NO C and NO C and NC C and NO Brown Switch Black Switch Black Switch Brown Switch SWITCH TERMINAL LS1 bb LS2 aa LS2 bb LC PS1 PS...

Page 17: ...ront Faceplate Removed VR Series Circuit Breaker Element Mechanism 1 LH Closing Spring 5 Spring Release Assembly 9 Manual Charge Socket 2 Motor Cutoff Switch 6 Shunt Trip Assembly 10 Ratchet wheel 3 L...

Page 18: ...nkage 1 Spring Release Close Latch 6 Ratchet Wheel 11 Anti Close Interlock 2 Pole Shaft 7 Spring Crank 12 Motor Ratchet Lever 3 Closing Spring Fixed End 8 Cam Shaft 13 Spring Release Close Clapper 4 C...

Page 19: ...Closing Spring Discharged 4 9 c Breaker Closed and Closing Spring Discharged 4 9 b Breaker Open and Closing Spring Charged 4 9 d Breaker Closed and Closing Spring Charged Charging Schematic 1 Main Li...

Page 20: ...does not fully open or close it is time to maintain the MOC in the cell Maintenance usually means cleaning and lubricating the MOC mechanism If the MOC has seen a large number of cycles however worn c...

Page 21: ...of the handle When charging is complete the closing crank goes over center with an audible click and the springs Charged Discharged Indicator shows Charged Remove the maintenance tool m NOTICE IF THE...

Page 22: ...s indicator reads OPEN d Push the circuit breaker into the cell until the mechanical stop is reached this will be indicated by an audible click At this point the side plunger has fallen into the front...

Page 23: ...uit breaker can be operated either electrically or mechanically Remove rotary racking handle before performing any testing b To further remove the circuit breaker to the disconnect position continue t...

Page 24: ...lace Insulation Integrity Main circuit to ground Withstand 15kV 60Hz for 1 Minute 5kV Rating 27kV 60Hz for 1 Minute 8 25kV and 15kV Ratings Hi pot Tester Clean and retest or replace Control circuit to...

Page 25: ...t is recommended that the equipment be capable of delivering 25 milliamperes for one minute The current delivery capability of 25 mA ac applies when all three vacuum interrupters are tested in paralle...

Page 26: ...from Ohm s Law and is expressed in micro ohms Repeat for the remaining two poles The resistance should not exceed the factory test levels more than 200 as stated in IEEE C37 09 Factory test levels ar...

Page 27: ...e Tool Mounting Testing Locations by Circuit Breaker Type CIRCUIT BREAKER DESIGNATION APPROXIMATE MECHANISM CHASSIS WIDTH INCH LOWER MOUNTING HOLE LOWER MOUNTING HOLE MARKER PLACEMENT HOLE AM4 16 VR 1...

Page 28: ...on a sheet of paper that can be kept as a record of the test Record the date of the test person conducting the test circuit breaker serial number and the operations counter on the tape or paper Figur...

Page 29: ...Marker CloSure Tool TM 15O 15O Figure 6 13 Determining the Distance Traveled Figure 6 14 Illustrative Testing Tape Sample Figure 6 12 Evaluate the CloSure Performance Date of Breaker Operations CloSu...

Page 30: ...lement requires maintenance only once every ten years or ten thousand operations which ever comes first After a ten year service interval or when ten thousand operations have been reached contact your...

Page 31: ...or burned Motor Cut Off Contacts open or burned Trip Coil Assembly Clapper fails to reset Closing sound but no close Pole Shaft Not open fully Trip Latch Reset Spring Damaged or missing Trip Bar D Sha...

Page 32: ...SWITCH Breaker Auxiliary Switch 94C9525G13 5 BREAKER POSITION SWITCH Breaker Position Switch PS1 94C9525H06 6 BREAKER POSITION SWITCH Breaker Position Switch PS2 94C9525H07 7 LATCH CHECK SWITCH Latch...

Page 33: ...33 Instruction Book IB182923EN September 2018 www eaton com AMH 4 76 VR VR Series Replacement Circuit Breaker...

Page 34: ...vard Cleveland OH 44122 United States Eaton com 2018 Eaton All Rights Reserved Printed in USA Publication No IB182923EN September 2018 Eaton is a registered trademark All trademarks are property of th...

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