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JRT-S motor double thermal protection relay
Product description
1、Overview:
The motor thermal protector is composed of two independent motor thermal protection units.
Due to long-term overload, frequent startup, insulation aging, phase failure, low quality of power grid or damage of motor cooling system, the motor will be seriously heated and even burned.
It can be seen that among the factors causing motor damage, temperature is the first and current is the second. Therefore, it should be the most reliable to directly detect the temperature of motor winding with thermal sensor (PTC).
This product uses this method to protect the motor, which is the development direction of motor protection.
2、Purpose:
This product is matched with PTC temperature sensor and can be used in various occasions requiring temperature protection. When the temperature of the protected motor rises due to any fault, the PTC resistance of the temperature sensing element will jump to the high resistance state. At this time, the motor thermal protection relay is released, that is, the control circuit of the motor is cut off to achieve the purpose of protection.
3、Main technical data:
Rated voltage: 220V ± 10%
RT1 action threshold resistance: 5.0K Ω
Rt2 action threshold resistance: 1.8K Ω
Contact load: AC 220V / 10A
DC 28V/10A
4、Service conditions:
Altitude ≤ 1500m
Ambient temperature - 20 ℃ ~ + 60 ℃
Relative air humidity ≤ 85%
The motor thermal protector is composed of two independent motor thermal protection units.
Due to long-term overload, frequent startup, insulation aging, phase failure, low quality of power grid or damage of motor cooling system, the motor will be seriously heated and even burned.
It can be seen that among the factors causing motor damage, temperature is the first and current is the second. Therefore, it should be the most reliable to directly detect the temperature of motor winding with thermal sensor (PTC).
This product uses this method to protect the motor, which is the development direction of motor protection.
2、Purpose:
This product is matched with PTC temperature sensor and can be used in various occasions requiring temperature protection. When the temperature of the protected motor rises due to any fault, the PTC resistance of the temperature sensing element will jump to the high resistance state. At this time, the motor thermal protection relay is released, that is, the control circuit of the motor is cut off to achieve the purpose of protection.
3、Main technical data:
Rated voltage: 220V ± 10%
RT1 action threshold resistance: 5.0K Ω
Rt2 action threshold resistance: 1.8K Ω
Contact load: AC 220V / 10A
DC 28V/10A
4、Service conditions:
Altitude ≤ 1500m
Ambient temperature - 20 ℃ ~ + 60 ℃
Relative air humidity ≤ 85%