Thermistor Relay Wiring Diagram. Ferrules with insulating sleeves must be used with twisted wires. Thermistor relay working principle selection fundamentals ptc type ms220va ziehl. THERMISTOR PROTECTION RELAY, 24VAC Lovato Electric from www.lovatoelectric.com Resistance temperature detector rtd working types 2 3 and 4 wire installation operation. Web i have a new aquastat type l8148e, the thermistor […]