The T series Thermo-Fuse^TM varistor is a housed unit comprising of a disk varistor connected in series with a thermally coupled fuse. Should the thermally coupled fuse be activated as a result of overheating, the varistor is disconnected from the power circuit and protects the device. In the worst case scenario, this could prevent the device catching fire.
Applications for ThermoFuse varistors include: Household appliances; Power supply units; Inverters in solar power systems; Drives; Lighting applications; Communication and data systems; Transient voltage surge suppression (TVSS)

The housing and the coating of the varistor are made of flame-retardant materials
Three terminations. Two are for connection to the active lines; the third can be connected to a signal status line
Two sizes of varistor are used in the T series ThermoFuse varistors, 14 mm and 20 mm
Designed for maximum operating voltages of between 130 and 100VRMS
Can withstand surge currents of up to 10.000 A (8/20 μs) and absorb up to 410 J (2 ms)