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Protector trip relay - Crompton Instruments - 250 Series - DC Transducer Trip
- High and low trip models
- Adjustable set point
- Adjustable time delay Internal differential
- LED trip indication
- Automatic reset
- Double-pole relay contacts
- Accepts standard process voltage or current signals
- Monitors forward/reverse Watts, VAr and VA
- Monitors under/over Watts, VAr and VA
- Power factor monitoring and control
- Nuisance tripping avoidance
- Customised options
- Distribution systems
- Generator sets
- Control panels
- Process control
- Motor protection
- Overload protection
The dc transducer protector relay offers user adjustable trip point (set point) and time 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 measured signal is noisy or unstable. These units require an auxiliary power supply.
Over High Trip Models
When the monitored signal exceeds the set point, the time delay is started. When the time has elapsed, the relay will energise and the red LED will illuminate to indicate the trip condition. The relay will automatically reset once the monitored signal falls below the set point minus the differential. When reset, the LED will extinguish and the relay de-energises. The time delay is not active when resetting.
Under Low Voltage Models
When the monitored signal falls below the set point, the time delay is started. When the time has elapsed, the relay will de-energise and the red LED will extinguish to indicate the trip condition. The relay will automatically reset once the monitored signal rises above the set point plus the differential. When reset, the LED will illuminate and the relay energises. The time delay is not active when resetting.
250 series protector relays offer various customised options to suit individual requirements. Please consult factory.
- Adjustment ranges – different adjustment ranges are possible for the set point and time delay controls.
- Differential – internally fixed value between 1% and 15%.
- Relay operation – standard models are fail safe, but the relays can be customised to energise or de-energise on trip.
||Low trip 0 to 80%
||High trip 40 to 120%
||High and low trip
Please specify input current/voltage, auxiliary voltage and required options at time of ordering.
Specification – DC Transducer Trip
|Nominal input current dc
||0-1mA, 0-5mA, 0-10mA, 0-20mA, 4-20mA volt drop 1V
|Nominal input voltage dc 1V to 50V, input resistance 10kΩ/V
||1V to 50V, input resistance 10kΩ/V
|Voltage burden 3VA maximum
|Overload 1.2 x rating continuously,
||1.2 x rating continuously,
|1.5 x rating for 10 seconds
||1.5 x rating for 10 seconds
|Set point repeatability >0.5% of full span
||>0.5% of full span
|Differential (hysteresis) Pre-set at 1%.
||Pre-set at 1%.
|Values 1 to 15% available on request
||1 to 15% available on request
|Trip level adjustment Low trip: 0 to 80%
||Low trip: 0 to 80%
|High trip: 40 to 120%
||High trip: 40 to 120%
|Time delay adjustable
||0 to 10 seconds
|AC auxiliary supply voltage
||100V, 110V, 120V, 208V, 220V, 240V, 480V, ±20%
|DC auxiliary supply voltage
||12V, 24V, 48V, 110V or 125V, ±20%.
|Auxiliary voltage burden
||2-pole change over
|Relay contact rating
||AC: 240V 5A non inductive
||DC: 24V 5A resistive
|Relay mechanical life
||0.2 million operations at rated loads
||0°C to +60°C (0°C to +40°C for UL models)
||–20°C to +70°C
||0.05% per °C
||Electrical stress surge withstand and non-function to ANSI/IEEE C37 90a
||DIN-rail with wall mounting facility
||Flame retardant polycarbonate/ABS
|Model 252 dimensions
||55mm (2.2") wide x 70mm (2.8") high x 112mm (4.4") deep
|Model 253 dimensions
||75mm (2.9") wide x 70mm (2.8") high x 112mm (4.4") deep
||Model 252: 0.4Kg approx.
||Model 253: 0.6Kg approx.