25S / 25V synchronism check relays

Solid state relays, designed for distribution systems to verify that the voltages on either side of a circuit breaker are synchronized, and in the proper phase and magnitude relationship to allow automatic closing.

These relays allow closing when both bus and line voltages are approximately normal, equal, in phase, and of approximately the same frequency.  

Product scope

​Type 25S synchronism check only
Type 25V synch check with dead-bus dead-line options

Why ABB?

  • Reducing operating costs
  • On-site/Retrofits - Existing panels can be modified and retrofitted at the customer’s site.
  • System installation at the customers site
  • Relays are tested at the customer site.
  • Assisting our clients in modeling their power system


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