ST10 series motor protector are both temperature and current sensitive. They can protect the applications like motor or transformer from over heating or loading.

Key Benefits:
• High current, long life & high reliability;
• Accurate tripping off time;
• Both current and temperature sensitive.

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Design Principles

Temperature protection:
When ambient temperature exceeds the specified value, the inside bimetal of ST10 series motor protector will trip off to cut the circuit. When the temperature lowers down, the bimetal will reset and the circuit is connected again.

Current protection:
Auxiliary heater works together with bimetal, which can control the trip off time precisely. When the current exceeds the prescribed value, ST10 will cut the circuit immediately.



• Electrical tools, mixer, water pumps and cleaners
• Electric motors
• Washing machines, ballasts, transformers


Item No.ST10
 Rated Voltage&Current125VAC/28A
R/T25℃ Current detection standard4~10S(Customized)
Case materialMetal
Case size(mm)37*16.2*7.6
Open temp. range50~200°C
Operating temp.tolerance±5°C,±10°C
Lead WireUL3321 16# black 70mm


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