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2c81-technical-bulletin.pdf
Current Protection
2C81 DC Current Sensing Relay
ObsoleteThis product is obsolete.
Consider the alternative CU-I/J or DI series relays for your application. Note that these relay series are not directly equivalent to the 2C81.
Features
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High sensitivity
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40-300V DC auxiliary supply Power supply fail relay drops out if the auxiliary supply fails.
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Optional 20-70V DC supply
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Optional mV input ranges
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Custom front dial calibration scale
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Two C/O output contacts
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One C/O fail alarm contact
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Optional delay timer
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Current pick up LED indication
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Power supply healthy LED indication
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Size 2M28-S draw out case
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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.