The temperature at which a Thermal Cutoff changes its state of conductivity to open circuit detection curret. The tolerance according to IEC60691 is from +0 to-10℃(With Japan Electrical Appliance and Material Law, on the other hand, they must function in the tolerance range of ±7℃).

Fusing(cut)-off temperature:

The fusing-off temperature indicates value measured in silicon oil with a temperature increased by 0.5-1℃ per minute and a detective current 100mA or less.

Th-Holding temperature:

The maximum temperature at which a thermal Cutoff will not cause a change in state of conductivity to open circuit while conducting rated current for 168 hours. This rating is required by safety standards based on IEC60691.

Tm-Maximum temperature limit:

The maximum temperature at which a Thermal Cutoff can be maintained for 10 minutes without reclosing. This rating is required by safety standards based on IEC60691.

Ir-Rated current:

The allowable maximum current which a Thermal Cutoff is able to carry.

Ur-Rated current:

The allowable maximum voltage which a Thermal Cutoff is able to be applied.