Siemens SENTRON 3VL System Manual page 331

Terminal covers/phase barriers:
Sealable terminal covers can be installed on the input and output side of the SENTRON VL
circuit breakers. They offer degree of protection IP30 for fixed-mounted or withdawable
circuit breakers in the connected position. In addition, extended terminal covers provide
separation between the phases if uninsulated busbars or cables are used
Extended terminal cover
Phase barriers
Phase barriers provide insulation on the input and output side of the circuit breaker. They
can be mounted in the specially formed slots on the input and output sides of the circuit
breaker. They can be used in conjunction with other connection accessories (except terminal
covers). The phase barriers can be used with fixed-mounted, plug-in and withdrawable
circuit breakers. Terminal covers must be used if the circuit breakers are mounted
immediately next to each other (see the Section Mounting and safety clearances).
Phase barriers
3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
Spare parts/accessories
Standard terminal cover
Use of phase barriers
15.1 Installation
331