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Phase Voltage Threshold, phase failure relay, under voltage, ywrkptu, ywr2kptust, sequence, true delay off,

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Phase failure relays with adjustable under voltage control, with the option of additional sequence control. Available in a din rail housing with a SPCO or DPCO output option. Both units can be specified as 3 wire or 4 wire and are self powered (no separate auxiliary supply is required). A range of nominal L-L input voltages can be specified from 110V L-L to 440V L-L, an under voltage setpoint can be set adjustable 5-25% of the specified nominal. The units will also trip on phase sequence (if specified), phase loss and on 4 wire units deviation of the Neutral. All tripping eventualities are subject to a delay, the delay being True Delay Off, adjustable 0.1-10secs as standard. If you loose everything you will still benefit from the delay timer, unlike many other types of phase failure relays. This makes these units ideal for mains to generator changeover systems where short supply interruptions are best ignored, thus eliminating false engine starts.

phase failure relay with under voltage control & true delay off ywrkptu (spco) ywr2kptu (dpco)
Phase Voltage Threshold, phase failure relay, under voltage, ywr2akptust, sequence, true delay off,

For full specification Click Here

Phase failure relays with adjustable under voltage control and hysteresis, with the option of additional sequence control. In a din rail housing and DPCO output, can be specified as 3 wire or 4 wire and is self powered (no separate auxiliary supply is required). A range of nominal L-L input voltages can be specified from 110V L-L to 440V L-L, an under voltage setpoint can be set adjustable 5-25% of the specified nominal and a return hysteresis adjustable 5-50% of the setpoint. For example, if a 400V unit is set with an under voltage control of 10%, the unit will trip (de- energise) at 360V, if the hysteresis is set at 50%, the return point equates to +50% of the under voltage control, i.e. +50% of 40V = 20V, therefore the unit will re-energise at 380V. The units will also trip on phase sequence (if specified), phase loss and on 4 wire units deviation of the Neutral. All tripping eventualities are subject to a delay, the delay being True Delay Off, adjustable 0.1-10secs as standard. If you loose everything you will still benefit from the delay timer, unlike many other types of phase failure relays. This makes these units ideal for mains to generator changeoever systems where short supply interruptions are best ignored, thus eliminating false engine starts, further enhanced with a generator "run down" period on the return of a healthy supply.

phase failure relay with under voltage control with delay on & true delay off ywr2akptus (dpco)