Current Protection

2C81 DC Current Sensing Relay

Summary

Features

  • High sensitivity
  • 40-300V DC auxiliary supply Power supply fail relay drops out if the auxiliary supply fails.
  • Optional 20-70V DC supply
  • Optional mV input ranges
  • Custom front dial calibration scale
  • Two C/O output contacts
  • One C/O fail alarm contact
  • Optional delay timer
  • Current pick up LED indication
  • Power supply healthy LED indication
  • Size 2M28-S draw out case
  • Made in Australia

Description

The 2C81 is a DC current measuring relay. The measured input current is derived from a mV drop across a current shunt. A switchmode power supply provides a very wide auxiliary operatingrange. A relay fail alarm is provided in the form of a C/O contact which is picked up when the auxiliary supply is healthy.

The 2C81 relay may be applied to provide a trip signal to a circuit breaker in a DC system in the event of a short circuit on the downstream side of the CB. An integrated timer may be specified to provide an adjustable delay to allow coordination with other protective devices.


Product information request

Railway rolling stock
Railway signalling
Industry
Energy
Instruments
Maritime
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