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Phase Failure Relays

RM4U (Single Phase), RM4T (Three Phase)

Refer to Catalog 8430CT0001

 

Table 23.178:

Output Relay and Operating Specifications

Type of Relay		RM4TG	RM4TU	RM4TR	RM4TA	RM4UB
Number of SPDT (C/O) Contacts 8 A resistive UL B300 a		2 C/O DPDT	2 C/O DPDT	2 C/O DPDT	RM4TA3 2 C/O DPDT   RM4TA0 1C/O SPDT	2 C/O DPDT
Output Relay State		Energized during fault free operation. De-energized or unable to energize on detection of phase reversal fault or failure of one or more phases.	Energized during fault free operation. De-energized on detection of under voltage or phase reversal fault or failure of one or more phases.	Energized during fault free operation. De-energized on detection of over voltage, undervoltage or phase reversal fault or phase failure.	Energized during fault free operation. De-energized on detection of phase imbalance fault, phase failure or phase reversal fault.	Energized during fault free operation. De-energized on detection of an over voltage or undervoltage fault.
Accuracy of the Switching Threshold Setting	As % of the set value	—	± 3%	± 3%	± 3%	± 3%
Switching Threshold Drift	Depending on the permissible ambient temperature	—	<  0.06% per °C	<  0.06% per °C	<  0.06% per °C	<  0.06% per °C
	Within the supply measuring range	—	<  0.5%	<  0.5%	<  0.5%	<  0.5%
Accuracy of the Time Delay Setting	As% of the full scale value: ± 10%	—	± 10%	± 10%	± 10%	± 10%
Time Delay Drift	—	—	<  0.5%	<  0.5%	<  0.5%	<  0.5%
		—	<  0.07% per °C	<  0.07% per °C	<  0.07% per °C	<  0.07% per °C
Hysteresis	Fixed	—	About 5% of the de-energization threshold	About 5% of the de-energization threshold	About 5% of the de-energization threshold	About 5% of the de-energization threshold
Measuring Cycle		< 80 ms	<  80 ms	<  80 ms	<  80 ms	<  80 ms

a	For additional contact ratings, refer to the catalog.

Table 23.179:

Relays with Adjustable Thresholds (Single Phase Voltage Relay)

Adjustable Time Delay	Rated Main Supply Voltage b	Control Threshold	Width in.	Width mm	Output Relay	Catalog Number	$ Price
0.1–10 seconds	100–200 V 50/60 Hz	Undervoltage 80–120 V Overvoltage 160–220 V	0.89	22.5	2 C/O DPDT	RM4UB34	362.00
	180–270 V 50/60 Hz	Undervoltage 160–220 V Overvoltage 220–300 V	0.89	22.5	2 C/O DPDT	RM4UB35	362.00

b	Can be used on other supply voltages provided that the minimum operational voltages, maximum voltage between phases and compatibility are within the control threshold ranges supplied in the table above.

 

Dimensions

 

I11	Discount Schedule