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iii
Instruction Book
IB182923EN September 2018 www.eaton.com
AMH-4.76-VR
+
VR-Series
+
Replacement Circuit Breaker
Table of Contents
DISCLAIMER OF WARRANTIES AND LIMITATION OF LIABILITY
ii
SECTION 1: INTRODUCTION
4
1.1 VISUAL INSTRUCTION BOOKLET ESSENTIALS
4
1.2 QUICK RESPONSE CODE
4
1.3 AVAILABLE AMH-4.76-VR+ CIRCUIT BREAKERS
4
SECTION 2: SAFE PRACTICES
7
SECTION 3: RECEIVING, HANDLING, AND STORAGE
8
3.1 RECEIVING
8
3.2 HANDLING
8
3.3 STORAGE
9
3.4 AMH-4.76-VR+ APPROXIMATE WEIGHTS
9
SECTION 4: DESCRIPTION AND OPERATION
12
4.1 VACUUM INTERRUPTER
12
4.1.1 VACUUM INTERRUPTER ASSEMBLY
12
4.1.2 CONTACT EROSION INDICATOR
12
4.1.3 CONTACT WIPE AND STROKE
13
4.2 PHASE BARRIERS
13
4.3 BUSHINGS AND DISCONNECTING CONTACT ASSEMBLIES
13
4.4 STORED ENERGY MECHANISM
13
4.4.1 CLOSING SPRING CHARGING
13
4.4.2 CLOSING OPERATION
13
4.4.3 TRIPPING OPERATION
14
4.4.4 TRIP-FREE OPERATION
14
4.5 CONTROL SCHEMES
14
4.5.1 TIMING
14
4.6 SECONDARY CONNECTION BLOCK
14
4.7 INTERLOCKS
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 COUNTER
15
4.8.2 MOC OPERATOR
15
SECTION 5: INSPECTION & INSTALLATION
20
5.1 EXAMINATION FOR DAMAGE
20
5.1.1 NAMEPLATE VERIFICATION
20
5.2 SURE CLOSE MECHANISM ADJUSTMENT
20
5.3 MANUAL OPERATION CHECK
21
5.4 VACUUM INTERRUPTER INTEGRITY
21
5.5 LOW FREQUENCY WITHSTAND TEST (INSULATION CHECK)
21
5.6 CONTACT EROSION AND WIPE
21
5.7 PRIMARY CIRCUIT RESISTANCE
21
5.8 ELECTRICAL OPERATIONS CHECK
21
5.9 DESCRIPTION OF OPERATIONAL POSITIONS
22
5.10 INSERTION PROCEDURE
22
5.11 REMOVAL PROCEDURE
23
SECTION 6: INSPECTION & MAINTENANCE
24
6.1 INSPECTION FREQUENCY
24
6.2 INSPECTION AND MAINTENANCE PROCEDURES
24
6.3 VACUUM INTERRUPTER INTEGRITY TEST
25
6.4 CONTACT EROSION AND WIPE
25
6.5 INSULATION
26
6.6 INSULATION INTEGRITY CHECK
26
6.7 PRIMARY CIRCUIT RESISTANCE CHECK
26
6.8 VR-SERIES
+
CIRCUIT BREAKER ELEMENT MECHANISM
CHECK 26
6.8.1 CLOSURE™ TEST
26
6.9 MAINTENANCE RECOMMENDATION
30
SECTION 7: REPLACEMENT PARTS
32
7.1 GENERAL
32
7.2 ORDERING INSTRUCTIONS
32