Overcurrent detection switch for protecting three-phase motors from burnout
Connected in parallel to the second phase of an AC power supply (three phase)

Basic Characteristics

Product summary

Overcurrent protection
For three phase

Product purpose

Protection switch for three phase

Intended use

Protect motors and pumps from burnout

Operating type

Quick-operating mechanism consisting of bimetals, helical springs, and moving contact plates

Compatible standard

RoHS compliant

Mechanical Characteristics

Outer dimensions


Case material


Operating temperature range


Connection terminal type

M4 terminal screw

Product mounting method

M4 terminal screw (22-mm pitch)

Electrical Characteristics

Rated voltage

AC 250/500V

Rated capacity

31 A at max.

Contact withstand count

Operation at 300% of the rated current / Manual return: 100 times

Withstand voltage

1500 VAC for 1 minute or 1800 VAC for 1 second

Insulation resistance

500 VDC megohmmeter
50 MΩ or higher

Characteristics Unique to This Product

  • Non-operating current and overload current are made to order