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IZM32 / IN32 low voltage air circuit breaker
MN013017EN May 2022 www.eaton.com
Section 1: Introduction
When withdrawn on captive compartment cassette
extension rails, IZM32 / IN32 circuit breakers can be
inspected, accessory items added, and minor maintenance
performed. The inside of the compartment can also be
inspected with the circuit breaker on its extension rails.
NOTICE
Please read and understand these instructions before
attempting to unpack, install, operate, or maintain this
equipment. Study the breaker and its mechanism carefully
before attempting to operate it on an energized circuit.
WARNING
IZM32 / IN32 circuit breakers should not under any
circumstances be applied outside their nameplate
ratings. Operation outside of these ratings could result
in death, bodily injury, or property damage.
Section 1: Introduction
1-1 General information
The IZM32 / IN32 air circuit breaker is a fixed or drawout air
circuit breaker design using an electronic tripping system.
It is designed and tested for use at nominal voltages of
AC380/415V, 440V and 500/690V. IZM32 / IN32 circuit
breakers are available with continuous current ratings from
800A to 4000A. The withdrawable & fixed frame sizes have
common height and depth dimensions. The circuit breaker
nameplate provides complete rating information. All IZM32
circuit breakers are 100% rated, and are built and tested in
an ISOT 9002 certified facility to applicable IEC and BS
standards (Figure 1-2).
IZM32 / IN32 circuit breakers use a rigid frame housing of
engineered thermoset composite resins, which has
high-strength structural properties, excellent dielectric
characteristics, and arc-tracking resistance.
The drawout IZM32 / IN32 circuit breaker is a through-
the-door design having three breaker positions with the
compartment door closed (CONNECT, TEST, DISCONNECT)
and one position out of its compartment on extension rails
(REMOVE). The operating mechanism is a two-step stored
energy mechanism, either manually or electrically operated.
IZM32
Figure 1-1 IZM32 / IN32 low voltage circuit breakers (800A-4000A)
NOTICE
WARNING
