Thermistor Trip Protection Relays

Thermistor Trip Protection Relay

Description

DIN rail mounting protection relays for use in single and three phase systems. Available in 55mm x 112mm or 100 x 112mm DIN rail cases.

 

Application

For over protection, under protection and combined under & over protection available in AC current AC voltage & frequency versions. Millivolt trip, DC voltage trip, Reverse Power, Phase sequence & Phase balance relays also available in our extensive range of protection relays.

Selection Guide
M200-TTA Automatic reset
M200-TTM Manual reset
Typical Applications
The M200 thermistor trip accepts positive temperature coefficient inputs. Typically used to monitor temperature in motor windings. When the thermistor is below its predetermined temperature the resistance is low and the M200-TTA/TTM relay is energised. A green LED indicates the safe condition. When the temperature exceeds the predetermined temperature the resistance of the thermistor rapidly increases, this increase in temperature is detected by M200-TTA/TTM and the relay is de-energised. The M200-TTM is manually set, once the relay has de-energised it will stay de-energised regardless of the temperature being monitored. The relay can only be reset via the reset push button on the front of the unit. The M200-TTA automatically resets once the temperature has dropped below the trip point. A yellow LED is provided to indicate the condition of the power supply.
Technical Specifications
INPUT  
Positive temperature coefficient thermistors: Sensors can be connected in series but 1500Ohms must not be exceeded
Trip Point 2500-3500 Ohm
Reset Point 1500-2300 Ohm
Total resistance of sensor loop 1500 Ohms max at nominal temperature
Differential Fixed 5%
Repeatability Better than 5%
RESET  
M200-TTA Automatic
M200-TTM Manual via push switch on front of product
AUXILIARY  
A.C. Voltage 115/230/400V±25%/45-65Hz/2VA
D.C. Voltage 24 volt(±20% / non-isolated)< 3 watt
WEIGHT&CASE  
  Approx 0.3kg. 55mm case
Ordering Information
Product Code Aux Freq Option
M200-TTA 230V 50Hz
Options
1 A.C. auxiliary in range 57.7 to 480 volts
2 Calibration at temperature other than 23ºC
Connection Diagrams

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