Monitoring relay CRU1-18, CRO1-18

• These units monitor the AC current to a load and operate relays if the
current goes below or above a set level. Front panel controls allow selection of:
• Under (CRU1-18) – or Over (CRO1-18)-current operation,
• current trip level and
• time delay before a trip triggers a relay response.
• LEDs indicate power on and trip status. A relay with volt-free changeover contacts is fi tted.
• Two versions for each type are available for monitoring currents of up
to 1A (CRU1-18-1, CRO1-18/1) and 5A (CRU1-18/5, CRO1-18/5)
• The unit can be powered either by a separate auxiliary supply of 24-
240V AC or DC or by the monitored supply, if suitable.
• These instructions contain important safety information. Please read
them thoroughly before commissioning, operation or maintenance of
the unit