TRB zener tripping unit

The TRB Zener tripping unit is an auxiliary device energized by protective relays to trip circuit breakers in a double trip relaying scheme. It is suitable for cases where the total trip current of the two breakers is within the relay contact rating, usually 30 amperes.

TRB-1 blocking valve is an auxiliary device to be used as a directional valve in a relaying scheme.

The TRB-2 unit can also be used for isolation of multiple trip paths to one breaker.

 Why ABB?

  • Long production life, ease of application and reliable protection
  • High quality design
  • 12 year warranty
  • Short lead times
  • Consistent on-time delivery
  • 24/7 customer support

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