Thermally Protected Varistors

A simple MOV will fail under the following conditions

1.product aging, leakage current gradually increase, varistor heating, Breakdown, fire.

2.In the case of transient overvoltage, the varistors are short-circuited, but the power supply does not stop working. In this case, there will be power-frequency current flow over the varistor, power-frequency current will cause the varistor heating, Breakdown, fire

Based on the principle that MOV will generate heat under the above two conditions, the heat energy is transferred to TCO or low temperature solder wire, which makes MOV disconnected from the main circuit before fire failure

1.Rated action temperature

The temperature at which an electric current of not more than 10 Ma changes the electrical state of the Thermal cutoff.

2.Measured action temperature

The temperature at which the electrical state of the Thermal cutoff is changed is measured by applying a load current of less than 10 Ma to an oil bath at a temperature of (0.5-1) â ° c per minute. Allowed deviation: TF + 0/-10 ° C -IEC-IEC 60691)

3.Keep the temperature

Constant load rated current for 168 hours without interruption, the highest temperature on the surface of the product body.

4.Rated voltage

The maximum voltage at which a Thermal cutoff can be safely disconnected in a circuit.

1.Full-size, full-voltage manufacturing capability.

2.Wider temperature range: 135 ° C ~ 165 ° C ~

3.all kinds of packaging methods can be produced.

4.Delivery Advantage: a small number of orders manual welding, a large number of orders machine welding, mode of production.

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