Why are there two current parameters for current sensing thermal protector?

It is a confusing question for some engineers. Actually, for current sensing thermal protectors, there are two current parameters. One is rated current. It is the nominal working current. The other one is tripping off current, also called over-loading current. For the rated current, for examples, 3A or 5A, it means that the thermal protector […]

Difference between creep action thermostat and snap action thermostat

According to the action type of contacts, the bimetal thermostat can be divided into creep action and snap action thermostat. General speaking, creep action thermostat can only be used for heating pad or cushion. Our WAA2 series thermostat belongs to creep action type.The function of creep action thermostat is for temperature adjustment, not for heating […]

What’s the lowest action temperature of your bimetal thermostat?

The lowest action temperature of our bimetal thermostat is 0C. It is creep action type and the relevant model number is 17AME-H. The contact making type can be normally closed or normally open. The main function of this thermostat is to remain the temperature inside of a narrow range. For example, OFF at 5C, ON […]

Why does the smaller size thermal protector have higher price?

Customers like to ask the question:” Why does the smaller size thermal protector have higher price?” It sounds that it does not make sense. In fact, there are some reasons: 1. For the small size thermal protector, all parts have to be more precise. It means that we need to use better manufacturing machines. The […]

Why is the thermal switch with lower temperature but higher price?

There are three reasons for thermal switch with lower temperature but higher price: 1. Thermal switches with lower temperature have to use some special materials, like bimetal strip and contacts. These materials have higher cost and better quality level; 2. In the process of manufacturing, both production and testing equipment for lower temperature thermal switches […]

Are there special cautions should be noted when testing thermal switch?

Please pay attention to the following issues when testing thermal switch samples: 1.The internal temperature of testing equipment should be even and consistent. The temperature difference between any two points should be less than 1℃; 2.The temperature rising speed should be under control. The speed can be fast before the temperature reaches the 10℃ lower […]

When and why do we need gold contacts of thermal switch?

1. If you need the contact resistance of thermal switch is less than 15 mOhm, you need gold contacts. The resistance of gold contacts is much smaller than silver contacts. 2. If the rated current of thermal switch is 250 mA or less, Gold contacts are necessary. It can prevent oxidation of the contacts at […]

How is a thermal switch most possibly to fail?

The contacts of a thermal switch are the most possible parts to fail. Once the contacts failed to open, the thermal switch would be malfunctioned. There are several possible reasons to cause this failure. 1. Working current is more than the rated current. For example, the rated current is 5A. If you use this thermal […]