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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:
ฉัน. หลักการทำงาน
‌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
บางรุ่น (such as the Schneider GV2-ME series) combine thermal and magnetic tripping to provide dual protection against overload (delayed) and short circuit (instantaneous).

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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 ชุด (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, 0.1-32ก).

III. Application Scenarios
Home Appliances: เครื่องปรับอากาศ, garbage disposals, ฯลฯ. (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 (10ก,15ก, 30ก)

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
จัดอันดับปัจจุบัน: Must match load requirements. ตัวอย่างเช่น, 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.

วี. Market Product Examples
‌Economical‌: Yueqing Lyuyi Electronics 98 ชุด (¥2.85/unit).
‌Industrial‌: Schneider GV3 Series (starting at ¥20.90).
‌Intelligent‌: Chint NXR-25 Thermal Relay (7-10ก, ¥34.20).