9
IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 www.eaton.com.cn
Section 2: Receiving, handling, and installation
Figure 2-9 Drawout circuit breaker in cassette
Figure 2-10 Drawout circuit breaker with automatic pri-
mary disconnects
Drawout cassette
A drawout circuit breaker is used in combination with a fixed
drawout cassette (Figure 2-9); the drawout circuit breaker is
equipped with automatic primary disconnects (Figure 2-10).
The cassette provides all of the necessary interfaces to the
drawout circuit breaker, including automatic primary and sec-
ondary connections. For the IEC circuit breaker, a cassette
style using horizontal stabs and horizontal customer busbar
terminals is available as standard (Figure 2-11). The cassette
terminal connections can be adapted to vertical busbar
connections with a variety of optional vertical adapters.
Mounting locations for cell (TOC) switches, safety shutters,
mechanical interlocks, and key interlocks are provided on the
cassette.
Drawout circuit breaker dimensions
The drawout circuit breaker connects to the fixed primary
stabs of the drawout cassette through the primary finger
clusters attached to the rear of the circuit breaker. Two dif-
ferent frame sizes cover all circuit breakers from an overall
dimensional standpoint.