FAQs

1. To ensure the quality consistence of our bimetal thermal switch, we got ISO9001:2015 version certification and fulfill the system strictly.

2. The life endurance we guaranteed is based on the working enviroment and rating. Different thermal switch has different level, like 10,000 cycles, 30,000 cycles.

3. The defective rate of our thermal switch that we promise to our customer is 20 to 100 ppm according to different application.

A: If you need to have temperature sensitive thermal protector samples, please prepare the following parameters:
1. Rated voltage, rated current.
2. Operating temperature and rest temperature of thermal protectors.
3. Length of lead wire, color, type and temperature resistance.
4. Application of thermal protector.
5. Mounting requirements if needed, including dimensional requirements. Our thermal protector can insert to the coils of electric motor or transformers.
B: If you want to have current sensitive thermal protector samples, you may prepare three more parameters besides the above:
1. Trip off current
2. Trip off time
3. Normally working temperature of thermal protector. It can not trip off under this temperature.

Simply leave your requirements and we will do the rest.

The operating principle of the thermal protector is simple and effective. At the heart of the protector is a bimetal snap-action disc. When the temperature of this disc reaches its pre-calibrated temperature it snaps open, resulting in an open circuit. This temperature is reached during a fault condition, caused by either an increase in ambient temperature, an increase in current flowing through the disc, or a combination of both. After thermal protector breaks the circuit, the system cools and it automatically resets allowing power to be restored to the circuit.

Opening Temperature

The temperature at which thermal protector makes the circuit open.

Reset Temperature

The temperature at which thermal protector reset the circuit as it cools.

Maximum Contact Ratings

The cycles of thermal protector reverts the circuit from open to reset when it works

under rated current and voltage.

Due to plenty of types of thermal protector, it is much of headache to choose which thermal protector is suitable. Hereafter are the three forms for thermal protector selection of three main industries (battery pack, motor and ballast), what you only do is to fill the form and send it to hcet@hcet.com, we would contact you!Thermal protector for battery packInstallation:In recharging circuit □In discharging circuit□In both recharging and discharging □;Other installation________________Recharging current: ________ A; Recharging time: _____minsDischarging current:________ A; Discharging time: _____minsMaximum current in abnormal situation: _____A; Abnormity time: _____minsTechnology requirements to protector：Opening temperature: _________ ℃；Opening precision: ________ ℃（normally ±5 ±8 ±10℃）Reset temperature：_________℃; Reset precision: ________ ℃(normally ±10~15℃)Resistance: ＜ ______ mΩ;
Lead wire：_______________
Installation and varnish way:

Installation：built-in□ out-lay□；

Varnish： drop varnish□ vacuum varnish process □(pressure_____MPa)

no drop varnish □ Immersion varnish□

Technology requirements to protector：

Opening temperature：________ ℃；Opening precision: ______℃（normally ±5 ±8 ±10℃）

Reset temperature：_________ ℃; Reset precision: ________ ℃(normally ±10~15℃)

Cycles: ________ ;

Lead wire：__________

Thermal protector for lighting, ballasts and transformers

Rated voltage：_______ V ；Working current: _______ A；cosФ：____ ；

Starting current: _____A; Maximum current of overload：________ A;

Ambient temperature: _______℃; Temperature rising rate: _________℃/mins.

Installation and varnish way:

Installation: Embeding into the coil □; Banding in the coil □;

The surface of power tube □; Other places_____

Varnish: drop varnish□ vacuum varnish process □(pressure MPa)

no drop varnish □ Immersion varnish□

Technology requirements to protector：

Opening temperature：________ ℃；Opening precision: __________℃（normally ±5 ±8 ±10℃）

Reset temperature：__________ ℃; Reset precision: _________ ℃(normally ±10~15℃)

Cycles: ________ ;

Lead wire：________________

Testing be done in the oven that the precision of constant temp is ±1℃. When testing, the thermocouple or thermometer should be place nearest to samples. During temperature rising ,when the temperature reaches 10℃ less than rated temperature, the temperature rising rate should be less than 0.5℃per minute and the testing current should be no more than 0.01A.

Yeah. We are. And we own 3 workshops, 2 offices about 100 workers.
Our factory is in Nanjing city Jiangsu, near Shanghai.
All clients are welcome to visit our factory.

www.hcet.cn, www.hcet.en.alibaba.com, www.hcet-cn.com

1000pcs

Our common lead time for bimetal thermal switch is 15 to 35 days upon receipt of advance. If we have inventory, the lead time could be 7-10 days. For new products ,the lead time would be 25 to 40 days.
Sometimes rush orders are also acceptable, but the lead time should be agreed by both sides before order release.