6RJ Series High Speed Tripping Relays

6RJ21-20 High Speed Tripping Relay



  • High speed operation
  • High burden
  • Self reset contacts
  • Hand reset flag indicator
  • 20 contacts
  • Equivalent function to MVAJ21
  • 2HSM520 specification


The 6RJ21 is a high burden relay suitable for application in high securitycircuit breaker tripping circuits & in particular where the initiatingcontact may be remote from the relay. The high burden may also allowthe satisfactory operation of external series elements.

The 6RJ21 has a high burden to provide immunity to capacitancedischarge currents & power to the coil is cut off at operation or iseconomized to a low figure to provide thermal protection.

High burden tripping relays are designed to withstand the 10uF capacitordischarge test such that the relay will not operate when a 10uF capacitorcharged to 120% of nominal operating voltage is applied across the coilof the relay.

The high speed relay coil is automatically protected from thermaldamage by an integrated ecomonizing circuit once the relay contactshave picked up & latched.

The contacts & trip flag indication operate on application of a controlvoltage. Contacts are reset upon removal of the control voltage. The flagis reset using the front panel push button provided the contacts are inthe reset position.

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Railway rolling stock
Railway signalling