Mechanic Strength Test

Pull Test

Apply 1.8 kg of tensile force to each lead wire in the thermal fuse for 10 minutes.

Push Test

Hold the lead wire 2 mm away from the body and apply 0.44 kg of force toward the body for 10 minutes.

Twist Test

Bend the lead wire 10 mm away from the body at a 90-degree angle, and then rotate that lead wire 180-degree while holding the body. Make sure there is no crack, scratch, or damage on lead line, body, and molding after each testing.

Calibration Verification Test

Put a sample into the thermostat, increase functioning temperature (TF) up to -20℃, and keep the state as it is for 2 hours to match the fuse temperature to the thermostat temperature. Then, measure functioning temperature (TF), while gradually increasing oven temperature 0.5 ~ 1℃ per minute. Cutoff shall be made within the specified tolerance of functioning temperature (TF).

Temperature Rising Test

When the working voltage and current are applied to the thermal fuses in room temperature, the increase of temperature shall not be more than 10℃ in measuring the surface temperature of the thermal fuse.

Insulation Resistance Test

After calibration verification test, measure insulation resistance with DC 500V insulation resistance tester. The resistance needs to be 0.2㏁ at least or higher.

Contact Resistance Test

It measures resistance between the both lead wires 10 mm away from the end of the fuse body, which must be 1.5㏁ or higher.

Dielectric Withstand Test

After conducting functioning temperature (TF) test, apply 500V voltage to cutoff fuse and maintain that state for 1 minute. There shall be no current carrying or arc.

Aging Test

When leaving the sample in -20℃ ± 3℃ of functioning temperature (TF) (above TF 200℃: -30℃ ± 4℃ of functioning temperature (TF)) for 48 hours, the fuse shall not be cutoff and there is no abnormality in each part and epoxy molding.

Overload Current Interrupting Test

The current shall be disconnected without any abnormality in appearance and each part, when gradually increasing functioning temperature (TF) from -10℃ under 15A 250V of loading.

Overload Current Teat

Current conducting state shall be maintained and there is no abnormality in appearance when 150V size and 3MS width current is applied 100 times with 10 seconds of cycle.