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EBP AND MPR - Thermistor Relays
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: Thermistor Control Relay
Thermistor Control Relay may be used in conjunction with any standard motor protection thermistor or multiple of 3 thermistors to provide an accurate method of signalling a motor over temperature condition. Its sleek profile and din-rail mounting arrangement and option of single or double pole relay contact allows it to be fitted within most situations.
Rest is automatic on the
range, however, for an alternative device please see the
range of Thermistor relay is designed to protect motors against over-temperature. The device benefits from having a choice of 3 methods for resetting after the monitored resistance falls below the reset level.
•RESET USING BUTTON ON THE PRODUCT FRONT
For the product to suit your application please see the selection chart below or contact sales:
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Short Circuit Detection
Latch / Reset
1 pole C/O
2 pole C/O
1 pole C/O
Trip Delay Timer
Where fitted the ‘Trip Delay Timer’ will inhibit the output contacts from releasing immediately a fault is detected.
The trip delay time is adjustable up to either 10 or 30 seconds depending on the model and will be either a ‘Standard’ delay or a ‘True’ delay type.
The 'Standard' delay type will require around 50% nominal supply voltage to be maintained for its operation, in the case of a total loss of power the unit
will trip with a minimal delay of approximately 0.5 seconds. This type of timer will allow the unit to ride through a short term voltage dip but not a total
The 'True' delay timer is not dependent on the supply voltage for its operation. The timing function will be available in the case of either a partial or total
supply failure. This type of timer will allow the unit to ride through either a short term voltage dip or a total loss of power lasting up to 30 seconds.
Power On Delay Timer
Where fitted, the ‘Power On Delay Timer’ will delay the output contacts from energising immediately the supply voltage is applied to the unit for a period
of up to 30 seconds.
The supply voltage will have to satisfy the conditions set by the supply monitoring relay for a healthy supply continuously for the ‘Power On Delay’ timing
period before the output contacts will energise.
If the unit detects a fault and releases the output contacts the supply voltage will once again have to satisfy the requirements of a healthy supply continuously
for the ‘Power On Delay’ timing period before the output contacts will re-energise.
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Supply Monitoring Relays
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