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Resettable Thermal Overload Protector For Electric Motors
The overload protection switch is bimetallic strip overload protector to prevent the main power line from being overheated and damaged due to overload. Also called a circuit breaker. Overload protection prevents overheating and fire by stopping the flow of excessive current from an overloaded circuit, while surge protection prevents damage to devices from sudden, high-voltage spikes. Overload protection devices, like circuit breakers and some power strips, trip to cut power and are resettable, whereas surge protectors divert or absorb excess voltage to the ground wire.
Electric Motors’ thermal overload protection switches are electrical protection devices based on the thermal effect of current. They are primarily used to prevent equipment damage or fire risks caused by sustained overloads or abnormal temperatures. The following are key features:
I. Working Principle
Bimetallic Thermal Trip Mechanism
Two metal strips (active and passive) with different expansion coefficients bend under heat, triggering a mechanical mechanism to disconnect the circuit. The response time is typically in the order of seconds to minutes.
Combined Protection Design
Some models (such as the Schneider GV2-ME series) combine thermal and magnetic tripping to provide dual protection against overload (delayed) and short circuit (instantaneous).
 Reset Thermal Overload Protection Switch 92 Series 8A 9 10A 12A 15A 20A Circuit Breaker |
 Thermal Overload Protector Push Button Manual Reset Circuit Breaker with 18AWG Wires and Cover |
 China Wholesale Thermal Overload Protector For Motors With Ul & Vde Certified Direct from Factory |
II. Main Types
Reset Type: Manual/automatic reset, such as the Taiwan 98 serie (3A-40A).
Electronic Type: A microprocessor monitors current, offering higher accuracy (such as the E99L model with indicator light). Thermal-Magnetic Type: Integrates a thermal element and electromagnetic coil, suitable for motor protection (such as the GV2ME20C, 0.1-32A).
III. Application Scenarios
Home Appliances: Aires acondicionados, garbage disposals, etc.. (such as low-current circuit breakers, starting at ¥0.85).
Industrial Equipment: Three-phase motor protection (such as a 380V phase loss protector, ¥30.13).
Power Distribution Systems: Molded Case Circuit Breakers (such as the Schneider CVS400F, 320A-630A).
 Manual Reset Thermal Switch Circuit Breaker Over Current Overload Protector (10A,15A, 30A) |
 Thermal Overload Protector AC 125, 250V 12A Push Button Reset Circuit Breaker |
 MRT0075 Manual Reset Thermal Overload, 3-4 HP, 4-Pole Auto Circuit Breaker |
IV. Selection Key Points
Corriente nominal: Must match load requirements. Por ejemplo, 10A-16A is recommended for home use, while starting current should be considered for industrial motors.
Environmental Adaptability: For high-temperature environments, select a model with temperature compensation.
Certification Standards: Products that comply with UL, GB 4943.1, and other certifications are preferred.
V. Market Product Examples
Economical: Yueqing Lyuyi Electronics 98 Serie (¥2.85/unit).
Industrial: Schneider GV3 Series (starting at ¥20.90).
Intelligent: Chint NXR-25 Thermal Relay (7-10A, ¥34.20).
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