For mechanical and electrical equipment such as lathes, electric ovens, mushroom machines, and other unattended equipment that require continuous operation during production, accidents caused by motor overheating or temperature control failure are common. Using PTC thermistors for motor overheating protection can effectively prevent them. Accidents happen. A common method for protecting motors from overheating is to bury extremely small sensors with PTC thermistor temperature sensing heads in the windings of the motor stator. Under normal circumstances, the PTC thermistor used for motor overheating protection is in a low resistance state and does not affect the performance of the motor. normal operation. When the inside of the motor overheats due to a fault, the PTC thermistor used for motor overheat protection undergoes a sudden change in thermal resistance, and the relay associated with it loses power and is released, and the motor stops running and waits for the fault to be eliminated before it can start running again. The advantage of this protection method is to directly monitor the temperature changes inside the winding, so that the motor can be protected before the overheating temperature breaks through the insulation level of the motor. At the same time, due to the recoverability of the TC thermistor, there is no need to replace it with a new one like a fuse resistor.

　　product description

　　DJWKG series temperature-controlled thermal switch (thermal protector) is a temperature-controlled switch specially used for motor overheat protection. This series of thermal switches are mainly suitable for industrial motor products, for motor under-voltage, over-voltage, overload, etc. Faults are reflected in the motor coil temperature, so DJWKG series thermal switches are ideal thermal sensor components for motor protection.

　　Features:

　　The DJWKG series temperature-controlled thermal switch (thermal protector) is small in size, sensitive in action, and reliable in performance. Its various indicators have reached the international advanced level. However, when the motor encounters a rapidly changing thermal overload, it cannot protect the motor.

　　3. Model name, appearance structure and dimensions:

　　Motor overheating protection temperature switch:

　　DJWKG series temperature-controlled thermal switch (thermal protector) is a temperature-controlled switch specially used for motor overheat protection. This series of thermal switches are mainly suitable for industrial motor products, for motor under-voltage, over-voltage, overload, etc. Faults are reflected in the motor coil temperature, so DJWKG series thermal switches are ideal thermal sensor components for motor protection.

　　Features:

　　The DJWKG series temperature-controlled thermal switch (thermal protector) is small in size, sensitive in action, and reliable in performance. Its various indicators have reached the international advanced level. However, when the motor encounters a rapidly changing thermal overload, it cannot protect the motor.

　　DJRBH motor protection PTC thermistor

　　Application scope:

　　This product is widely used in situations where over-temperature protection is required. When the product is installed in equipment that requires over-temperature protection, the PTC resistance signal is transmitted to the motor protector. When the temperature approaches the insulation heat-resistant grade, the motor protector disconnects the circuit to implement protection.

　　Features:

　　Made of ultra-small PTC thermistor, it has small size, long life, good stability and high sensitivity. The technical indicators have reached the international level of similar products.

　　use

　　It can be used alone or in series to control the temperature at different points in the same circuit.

　　Technical data

　　The control temperature range is Tk60℃～Tk180℃. The control temperature Tk is set to a specification every 5°C. One to six cores can be produced according to user requirements. The SCRBHC series adopts German DIN 44080, DIN 44081, and DIN 44082 standards.

　　naming method:

　　E: 1 temperature sensing head Z: 2 temperature sensing heads D: 3 temperature sensing heads V: 4 temperature sensing heads S: 6 temperature sensing heads

　　Standard lead length DS: 520 200 200 520 DK 520 520 (unit: mm)

　　Regular model:

working principle

　PTC thermistor has positive temperature coefficient resistance characteristics. When the temperature reaches its Curie point, the phase change of the semiconductor ceramic begins, and its resistance value increases rapidly with the increase of temperature. The change is especially obvious near the control temperature point Tk, thus serving the purpose of controlling the circuit.

It is recommended to use the thermistor sensor according to the following table (for reference only)

Control the lead color corresponding to the temperature

Hua Ju Temperature Sensor Co., Ltd. overheat protection type PTC thermistor and Murata overheat protection type PTC thermistor interchange comparison table

Installation instructions:
Fix the sensor at the location where the temperature needs to be detected (usually installed in the winding). Do not knock or squeeze the sensor chip hard during installation. Do not let the lead bear tensile force. The lead is connected to the motor junction box. It must be used in conjunction with a motor protector to control motor over-temperature.