Prevents burnout of a three-phase motor

Basic Characteristics

Product summary

Detects overcurrent / locked rotor current and protects a motor from burnout

Product purpose

Prevent burnout of general-purpose three-phase motors

Intended use

Submerged pump
Various general-purpose motors
and more

Operating type

Bimetal type (Convert a current applied to the product into heat in the internal heater, which then operates the bimetal and interrupts the circuit)

Compatible standard

UL (with some exceptions)

Mechanical Characteristics

Case material

Phenolic resin
(UL 94, V-0)

Operating temperature range

Temperature near motor: 20°C to 100°C
No freezing or condensation allowed

Connection terminal type

Solder incurved terminal
With auxiliary metal fittings for fixing leads in place

Product mounting method

Fixed in place with M4 screws or by other means
66-mm interval

Electrical Characteristics

Rated voltage

AC 250/500V

Rated capacity

Up to 15 kW

Contact withstand current


Contact withstand count

1,000 times or more

Withstand voltage

1500 V for 1 minute
Leakage current: 10 mA or less

Insulation resistance

50 MΩ or higher with a 500-VDC megohmmeter

Characteristics Unique to This Product

  • Set operating temperature: 100°C to 140°C
  • Set return temperature: 60°C to 70°C
  • Temperature tolerance: ±10°C