Temperature Control Protection Relay
Protection Relay for temperature applications TR-42 has been created as an accessory of main importance for resin or air insulated three-phase MT transformers, as protection against dangerous over temperatures on the insulating coil, on the winding and to manage the intervention of cooling fans. The temperature is detected by 3 or 4 temperature sensors Pt-100 DIN 43760, three of them are located in the transformer coils, the fourth on the core.
Display of the actual temperature of the 4 RTD
Display & storage of the highest temperature of each RTD
3 programmable output contacts from 0° to 220°C level 1, level 2 and FAN control
Automatic and “Always ON” fan mode
Alarm of TR-42 failure or PT 100 disconnection
Automatic fan start every week (bearing protections)

Parameter Name	Parameter Value
Display	digital
Type	programmable
Use	for transformers
Other characteristics	panel-mount RS-485
Maximum temperature (°C)	-10 - 240