Back to 11 Pin Plug In Units
Thermistor-Relay

Thermistor Motor Protection Relay

R458.75

Thermistor motor protection unit which interfaces directly to a PTC sensor to provide protection of motors, alternators, transformers, etc. The unit will trip if the nominal trip temperature for the sensor is exceeded.

 

The fault latching facility is incorporated which can be reset via the front panel membrane switch or opening contacts 7 & 8. A test facility to simulate fault conditions is also incorporated on the front panel membrane switch.

 

The ON and OFF times can be adjusted independently.

 

Features:

 

  • Fail-safe control feature
  • Direct connection to PTC sensor
  • Connect up to six thermistors
  • Latching facility
  • Test/reset button to simulate fault condition and reset latch
  • Cable or sensor fault detection
  • Power supply ON and Relay ON LEDs
  • Output 10A SPDT
Clear selection
Category:

Description

Mode of Operations:

 

Under normal conditions the relay is energized. If one of the thermistors reaches nominal trip temperature the relay will de-energize. If the latch is connected between 8 & 9 the relay will only re-energize if the latch is opened or the front panel membranes which is pressed and the temperature fall sat least 5% below trip value.Under normal running conditions the front panel membranes can be pressed to imitate a trip condition. The relay will de-energize and re-energize after a set time period.

 

EXAMPLE :

 

A thermistor imbedded in the windings of a motor will reach the trip temperature to protect the motor from over heating.

 

Sensor Specifications:

 

Sensor Type PTC
Input Impedance 2200Ω
Short Circuit Current 1mA
Open Circuit Voltage > 2.5mV
Response Time 0.05sec
Max Cold Resistance of PTC Sensor
Trip Threshold 3100Ω
Recovery Threshold 1600Ω
Short-circuit Detection <20ω
Repetitive Accuracy 0.5%

Output Specifications:

 

Output Specifications SPDT
Rated Isolation Voltage 6000 VAC (contact / electric)
1000 VAC (contact / contact)
Nominal Rate in AC1 (AG-Ni) 1500 VA
Rated Current 10A
Rated Voltage 250V
Mechanical Life 10×106 cycles
Electrical Life 10×103 cycles (at max load)
Operation Frequency ≤ 1800 cycles/h

Supply Specifications:

 

Power Suppy AC Type (Galvanic) 110, 230, 400V, 525V ± 10% 50 / 60 Hz ± 5Hz
Isolation 4kV
Consumption ± 3VA
±6 VA 525 V
Power Suppy DC Type (Non-galvanic) 12, 24, 48V ± 10%
Isolation None
Consumption ± 100mA

General Specifications:

 

Power ON Delay ≤ 300 ms
Power OFF Delay ≤ 200 ms
Indication for
Power Supply ON LED red
Output ON LED green
Cable fault Power LED (flashing)
Environment
Degree Of protection IP 20
Operating Temperature -10 to + 50°C
Storage Temperature -50 to + 85°C
Weight 200g

Additional information

Supply Voltage

525Vac, 400Vac, 230Vac, 110Vac, 48Vac/dc, 24Vac/dc, 12Vac/dc

Reviews

There are no reviews yet.

Be the first to review “Thermistor Motor Protection Relay”

Related products

Electro-TNE-Star-Delta
ElectroDev Star Delta – TNE

The unit is designed to enable star - delta starters to switch between star and delta safely. The star - make period can be adjusted with the front potentiometer. A set pause time of 8Oms prevent contractors operating simultaneously.

 
Features:
 
  • Oscillator control time circuit
  • Potentiometer adjustable time setting
  • Fail safe operation
  • Repeatable deviation: <1%
  • LED indication for STAR and DELTA outputs
  • Output 10A SPDT
R431.87 Select options This product has multiple variants. The options may be chosen on the product page
One Shot Timer – T1P
One Shot Timer – T1P

Single function on-adjustable timer to initiate a 0.5 sec pulse on energization and/or de-energization. By bridging contacts 5 & 6 the relay will only pulse on application of the supply and by bridging out contract 6 & 7 the relay will only pulse when the supply is removed. The supply has to remain on for at least 3 seconds for the pulse on removing of power to function correctly. A 1 second pulse can be supplied on demand.

 
Features:
 
  • Selectable pulse on energization and/or de-energization
  • Non-adjustable pulse length of 0.5seconds (1sec on demand)
  • LED indication for power supply ON
  • Output 10A SPDT
R431.87 Select options This product has multiple variants. The options may be chosen on the product page
PLUGIN-V1E
Single Phase Over / Under Voltage Monitor – V1E

Connected to a supply, the V1E measures sinusoidal voltage. The relay operates as long as the phase - neutral voltage is within the set upper and lower limits.

 
Features:
 
  • Monitoring relay and measuring relay for upper / lower phase to neutral voltage control
  • Measures if phase to neutral voltage are within set limits, present and in sequence
  • Measures on own power supply
  • Upper and lower limits separately adjustable
  • LED indication for over / under volts
  • Latch facility incorporated
  • 10second start-up delay
  • 180second response delay
  • Output 10A SPDT
R512.51 Select options This product has multiple variants. The options may be chosen on the product page
Phase Sequence Monitor – SF1
Phase Sequence Monitor – SF1

The SF1 Monitors negative phase sequence (NPS) voltage to detect phase failure, phase reversal and phase imbalance. The NPS voltage of the unit can be djusted from 7-15%. When any of these faults occur the unit will de-energize. The relay will only re-energize if the supply voltage corrects itself. The unit will not react to a balanced voltage variation

 
Features:
 
  • Monitoring relay for 3-phase voltage control
  • Measures if all 3 phases present and in sequence
  • Detection of phase asymmetry
  • Insusceptible to balanced supply voltage variation
  • Insensitiveto regenerated EMF
  • Fastresponse to reverse phase sequence
  • Relay ON LED
  • Output 10A SPDT
R407.68 Select options This product has multiple variants. The options may be chosen on the product page