PTC-relays Type MSF220VL

Product selection

Index

PTC-Resistor-Relay for dry transformers, 4 PTC-circuits, intelligent fan control, monitoring of core temperature

Part number

T221674

AC/DC 24 - 240 V

Approvals

Product description

The MSF220VL is particularly suitable for monitoring of temperatures at dry transformers, when also the temperature of the core shall be measured. Monitoring of core temperature is especially required in rectifier transformers because of harmonics causing heat in the core.

An intelligent control prolongs automatically the runtime of a cooling-fan, depending on the load of the transformer. Each PTC-circuit is monitored for break and short circuit. This reduces probability of false alarms. Relays in operating-current mode prevent from a trip-signal when switching on supply voltage.

The device can be adapted to different applications with 4 programs:

Fan-control - alarm - trip (winding) - trip (core)
Alarm - trip (winding) - trip (core) - alarm (fault)
Fan-control - alarm - trip (winding) - alarm (fault)
Fan-control with hysteresis T1/T2 - alarm – trip (winding) - time relay

Overview of functions

4 inputs for PTC
Intelligent control of fan
Automatic fan-test 1x / week
electronic reclosing lock for alarms (trip) connectable
Monitoring of sensors
Test-button
Simple testing with disconnectable monitoring of break and short circuit (for 10 minutes)
cURus
LEDs for alarms, states of relays and sensors
Housing for mounting on DIN-Rail or wall-mount(option)
Mounting height 55 mm
Universal supply voltage AC/DC 24-240 V
DEWA-standard for Dubai
Accessory: Front mounting kit type ER4