PTC Resistor Relay Model MSF220V, 3 PTC circuits, for Dry-Transformers, AC 220-240 V, intelligent fan control, (Ordering Code T221738)

The MSF220V is particularly suitable for the temperature monitoring at dry transformers. 3 PTC-circuits with different nominal response temperatures (NRT) can be connected to this unit, one for controlling a fan (forced cooling) and two for alarms. Each PTC-circuit is monitored for break and short circuit. This reduces the probability of false alarms.
• 3 PTC-circuits
• MSF 220 VU for universal supply voltage AC/DC 24-240 V
• intelligent control of fan (relay K0, 1 normally-open contact)
• ALARM 1 in closed-circuit current mode (relay K1, 1 change-over contact) for pre alarm. Signals also error in any sensor and interruption of supply voltage.
• ALARM 2 in operation current mode (relay K2, 1 changeover contact). No signal when switching on and off the supply voltage.
• all output relays potentially separated from each other.
• monitoring of sensor lines
• TEST-button (stop possible before ALARM 2)
• Simple testing with disconnectable monitoring of break and short circuit  (for 10 minutes).
• LEDs for ON, sensor error, Fan, ALARM 1 and ALARM 2
• UL recognized component
• plug-in terminals
• housing for mounting on DIN-rail or wall-mount
• mounting height 55 mm

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► Operating Manual