2C81 DC Current Sensing Relay

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 operating range. 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.

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