GE Industrial Solutions Entellisys Installation - Manual (Page 56)

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Entellisys Low-voltage Switchgear
Chapter 5. Installing and Removing Circuit Breakers
The breaker is prevented from being closed until the key is
reinserted and captured in the breaker compartment key
interlock mechanism.
Secondary disconnects on the FRE provide the voltage signals
across each fuse to the OPEN FUSE LOCKOUT DEVICE on
the associated circuit breaker, Fig. 5-21.
Fig. 5-19. View showing FRE key interlock locking FRE in connect
position
Fig. 5-20. Key is captured in key interlock until breaker is opened
Fig. 5-21. View showing Open Fuse Lockout Device on the associated
breaker