Thermal overload relay are generally installed in places where the temperature is relatively high. It must be on the housing of the motor. A relay that looks electrically correct can still be thermally wrong if it causes overshoot, short cycling, heater runaway, compressor damage, contact wear, or an unsafe fail state. We've also included maintenance tips to help keep it functioning properly and a troubleshooting guide if you happen to find a. Today we will use the most common language to understand thermal relays, focusing on how to judge whether a thermal relay is good or bad. Important parameters of thermal relays: Generally speaking, there are three points, thermistor, normally open point no and normally closed point nc, and manual. Use a clamp-on ammeter to measure the current, then observe the thermal relay action current, if it is indeed larger than the action current, please check the motor, if the motor is not a problem, replace the high-capacity thermal relay, such as than the thermal relay action current is small, need. A thermal overload relay is like a guardian for your motor. This small but powerful device ensures your machines run safely and efficiently. A component like a cooling fan or a horn might work perfectly one moment and fail to turn on the next, suggesting the internal switch contacts are sticking or failing to close.
