STH6 (High current 13.5A-35A)


Key Benefits:

• High current range 13.5A-35A.
• Good sealed.
• Small size, suitable for embodied inside the coil.
• Metal case, can withstand 50KG coil shaping pressure, has good thermal conductivity.
• Pure temperature products, the current does not pass through the bimetal disc, there is no current heating effect, and the temperature control is accurate.

Download datasheetGet A Qoute


STH6 is a high current thermal protector for motor, transformer, coil, and electronic products. Motor thermal protection switch has excellent capabilities and performances and has met the test requirements regarding temperature, insulation resistance, contact resistance, etc.



• Electric Motors
• Transformers
• High-pressure cleaners
• Floor scrubbers

• Water pumps
• Coils

Supporting Technology

• Integrate the resources of the global supply chain, the two-pieces are made of materials from the world’s largest two-piece manufacturer, the United States EMS, and the shell is made of precision CNC cutting.
• The springs are made of Japanese materials and are processed and produced by Japanese stamping parts suppliers.
• The core componentss Bimetal-disc fully automated molding equipment and temperature screening tunnel kiln production testing, with good consistency and stable performance.


Let us know your requirements below and we will do the rest.

Technical parameter

Technical Data

Operating typeNormally closed
Operating temp. (every 5°C step)70-200°C
Reset temperature range≥35°C(≤95°C NST)
Rated voltage277VAC/24VDC
Life cycles cosΦ1.0 13.5A/10000 cycles
Life cycles cosΦ0.6 35A/2000 cycles
Contact resistance (55mm length)≤50mΩ
Insulation voltage1.5KV
Insulating sleeve length16mm
Lead wire-teflonUL10362 Yellow, AWG17
Lead wire-electric
UL3398 White, AWG17
Length of standard55/55mm

Let us know your detail requirements below and we will do the rest.


Temperature and lead wire spec of motor overcurrent protection STH6 could be made according to the customer’s requirements.



Let us know your requirements below and we will do the rest.


Contact Us