Protector Trip Relays
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Energy Division Crompton Instruments Protector Trip Relays >

An extensive range of electronic control products providing continuous monitoring and protection ofany electrical parameter. When the monitored parameter deviates from the desired set point limit, the relay will operate to prevent damage to the power asset. Designed to suit a wide variety of applications the range offers both traditional and technologically advanced products, from single parameter units through to multifunctional microprocessor based protection relays.This versatile range features a host of DIN-rail or wall mounted protectors offering numerous tripfunctions for single and...

Nominal input current1A or 5A from CT secondary. > 252-PAU252-PAO 0.2A to 10A available on request Nominal frequency 50, 60 or 400Hz Input current burden 0.5VA per phaseOverload > Contact Set 1Contact Set 2Relay InputSupply 2 x rating continuously, 10 x rating for 3 seconds Set point repeatability >0.5% of full span Differential (hysteresis) Pre-set at 1%. Values 1% to 10% available on request Trip level adjustment 40 to 120%. Customised adjustment available Time delay adjustable 0 to 10 seconds AC auxiliary supply voltage 100V, 110V, 120V, 208V, 220V, 240V, 480V, 20% DC auxiliary supply...

Frequency protectors offer user adjustable frequency trip point (set point) anddifferential (hysteresis) settings. The set point adjustment range is centred around the nominal 50Hz, 60Hz or 400Hz system frequency. The differential setting adjustment can be used to reduce nuisance tripping if the measured signal is noisy or unstable. When the measured frequency moves outside the set point limit, the relay will operate, giving an alarm or initiation signal. As soon as the monitored frequency moves outside of the set point limit, a trip will occur. The units draw their operating power from the...

Combined voltage and frequency protectors provide the most popular relayfunctions inone convenient package. The products offer user adjustable trip point (set point) for voltage and frequency, plus adjustable time delay settings. The set point adjustment range is 25%, operating between 75% and 100% of the nominal supply for under-voltage and between 100% and 125% for over-voltage. The frequency set point adjustment range is centred around the nominal 50Hz, 60Hz or 400Hz system frequency. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays are...

Rotating machines are particularly vulnerable to incorrect phase sequence. Three-phase motors can rotate in the wrong direction, potentially leading to physical damage or the risk of injury to personnel, yet voltage and current readings may appear normal. If one phase is lost because of a blown fuse, electric motors can continue to operate (single-phasing) which can result in severe electrical or mechanical damage. This relay has the added advantage that it will detect the phantom or regenerated phase that can be caused by a single-phase failure on some equipment or when running motors at...

Model 256 Nominal voltage 100V, 110V, 120V, 220V, 230V, 240V, 277V, 380V, 400V, 415V, 440V or 480V Nominal current 5A or 2, 3, 4, 6, 8 and 10A System frequency 50, 60 or 400HzBurden Voltage: 3VA maximum Current: 2VA maximumCurrent overload 2 x rating continuously, > 35mm(1.37֔) 10 x rating for 3 secondsVoltage overload 1.2 x rating continuously, 1.5 x rating for 10 secondsMonitoring range Power factor: 0.5 inductive/unity/0.2capacitive > 135mm (5.3) Current: 20 to 100% of nominal input Set point repeatability >0.5% of full span Differential (hysteresis) Pre-set at 1% > 50 (1.96)60 (2.36)...

DC voltage protectors offer user adjustable trip point (set point) and time delaysettings. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays up to 30 seconds are available. As soon as the monitored signal moves outside of the set point limit, the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measured signal is noisy or...

RTD temperature sensors are often fitted inside electric motors to detect hot spotsin the windings or the bearings. RTD sensors are popular because they offer a good accuracy for a reasonable price. The same sensors can be used inside transformers, generator sets, gas turbines or as part of a process control system. Hot spots can be caused by many conditions such as overloads, over-voltage, unbalanced supply, worn bearings, ineffective cooling, poor ventilation, shorted turns, insulation breakdown, single phasing etc..The Hot Spot 3 protector continuously monitors the three RTD temperature...

When used in conjunction with current shunts the millivolt protector can be used tomonitor battery charging currents, current drain or under/over-current. Monitoring of under/over-temperature and detection of hotspots can be achieved in applications using thermocouples. All industry standard shunts and all popular thermocouples are supported.The millivolt protector relays offer user adjustable trip point (set point) and timedelay settings. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays are available. As soon as the monitored signal moves outside...

The dc transducer protector relay offers user adjustable trip point (set point) andtime delay settings. The time delay setting adjustment range is typically 0 to 10 seconds, although longer delays are available. As soon as the monitored signal moves outside of the set point limit the time delay is activated, after which a trip will occur. The time delay prevents the relay from tripping for a predetermined period to prevent nuisance tripping. The products also feature an internal differential (hysteresis) setting of 1% to reduce nuisance tripping if the measuredsignal is noisy or unstable....