Page 54 - Motor protection and control Manual motor starters, contactors and overload relays

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MS132-T circuit breakers for transformer protection

02

Low voltage transformers are used to supply power to control and auxiliary circuits in

distribution and automation boards and to provide galvanic isolation. These
transformers may be damaged by an electrical failure (short-circuit or overload on
the primary side), therefore a proper protection should be provided.

Complete portfolio S1-PB1-25 PB1-1-32
Manual motor starter accessories are
suitable throughout the complete range.
Moreover ABB offers special accessories
for fast single-phase setup.

Troubleshooting
made easy
MS132-T feature a magnetic trip
indicator. This way, every tripping
event will be distinguished, making
troubleshooting a lot easier and faster.

Transformer
protection
MS132-T is an inrush compensated circuit
breaker for control transformer protec-
tion. With the right selection, it provides
overcurrent protection on the primary side
of the transformer. This avoids expensive
protection on the secondary side.

Circuit breakers for transformers protection
are specially designed for fuseless protection of
control transformers on the primary side against
overloads and short-circuits.

Selection table MS132-T with ABB control
transformers:
Please refer to document no. 2CDC131111D0201

Application example
Protection of transformers for power supply of
control and auxiliary circuits, both in distribution 2CDC131062C0201 - Rev. B
and automation boards (checking, signaling,
interlock, etc).