Siemens SENTRON 3VL160X System Manual page 88

Installing/mounting
6.3 Locking devices
A tappet on each end of the rocker mechanically accesses each of the breakers through an
opening in the mounting plate and the base of the molded case circuit breakers. The rear
interlocking module prevents both molded case circuit breakers from being in the "ON"
position at the same time.
The rear interlocking module can be used with fixed-mounted, plug-in and withdrawable
molded case circuit breakers.
Cross wiring of internal accessories via the rear of the molded case circuit breakers is not
prevented.
This locking version is possible with all operating mechanism types (toggle lever, rotary
operating mechanism, and motorized operating mechanism).
88
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03