iiiIZM32 / IN32 low voltage air circuit breaker MN013017EN May 2022 www.eaton.com
Instruction Manual MN013017EN
Contents
SECTION 1: INTRODUCTION .....................................................1
1-1 General information .............................................................1
1-2 Safety features ................................................................2
1-3 Safe practices .................................................................2
1-4 Qualified personnel .............................................................2
SECTION 2: RECEIVING, HANDLING, AND INSTALLATION ............................3
2-1 General information .............................................................3
2-2 Suggested tools ................................................................3
2-3 Unpacking circuit breaker ........................................................3
2-3.1 Storing circuit breaker ..................................................... 3
2-4 Lifting circuit breaker ............................................................4
2-5 Circuit breaker inspection ........................................................4
2-6 Adapting cassette ..............................................................5
2-6.1 Rejection interlocks ....................................................... 5
2-6.2 Installing secondary jumpers................................................ 5
2-7 Installing drawout circuit breaker. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2-7.1 Circuit breaker positioning .................................................. 6
2-7.2 Levering circuit breaker .................................................... 8
2-8 Fixed circuit breaker ...........................................................11
2-9 Circuit breaker operation ........................................................11
2-10 Technical data ................................................................12
SECTION 3: CIRCUIT BREAKER DESCRIPTION AND OPERATION ......................15
3-1 Introduction ..................................................................15
3-2 Basic circuit breaker assembly ...................................................18
3-3 Operating mechanism ..........................................................18
3-3.1 Manual operation ........................................................ 19
3-3.2 Electrical operation ...................................................... 19
3-3.3 Anti-pump feature ....................................................... 19
3-4 Electronic tripping system ......................................................20
3-4.1 Microprocessor-based trip unit ............................................. 20
3-4.2 Rating plug............................................................. 20
3-4.3 Current sensors ......................................................... 20
3-4.4 Frame rating module ..................................................... 20
3-4.5 Trip actuator ............................................................ 21
3-4.6 Fixed high instantaneous non-adjustable trip .................................. 21
3-4.7 Non-automatic device .................................................... 21
3-5 Secondary contacts and connection diagrams .......................................21
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