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IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 www.eaton.com.cn
Section 1: Introduction
Section 1: Introduction
1-1 General information
The IZM63 / IN63 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. IZM63 / IN63 circuit
breakers are available with continuous current ratings from
5000 to 6300A. The withdrawable & fixed frame sizes have
common height and depth dimensions. The circuit breaker
nameplate provides complete rating information. All IZM63
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).
IZM63 / IN63 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 IZM63 / IN63 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.
When withdrawn on captive compartment cassette exten-
sion rails, IZM63 / IN63 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
IZM63 / IN63 circuit breakers should not under any cir-
cumstances be applied outside their nameplate ratings.
Operation outside of these ratings could result in death,
bodily injury, or property damage.
IZM63
Figure 1-1 IZM63 / IN63 low voltage circuit breakers (5000-6300A)