Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
110 Manual, 03/2019, A5E03603177010-03
Line protection applications of 3VA molded case circuit breakers
The main applications of the circuit breakers as line protection components are:
● In main switchboards to provide protection for cables to subdistribution boards
● In subdistribution boards to provide protection for cables to small distribution boards
● Protection for mixed loads (e.g. machinery, lighting, heating)
The trip units for line protection are designed to provide overload and short-circuit protection
for:
● Cables
● Conductors
● Non-motor loads
Suitable 3VA molded case circuit breakers and trip units
3VA molded case circuit breakers equipped with the following trip units are suitable for use in
line protection:
● 3VA1 breakers with thermal-magnetic trip units
– TMs 2-series (Page 111)
● 3VA2 breakers with electronic trip units
– ETUs 3-series (Page 115)
– ETUs 5-series (Page 131)
– ETUs 8-series (Page 131)
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