Prevents burnout of a single-phase motor
Higher tracking resistance than the 122 type

Basic Characteristics

Product summary

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

Product purpose

Prevent compressor motor burnout

Intended use

Compressor (for refrigerators, air conditioners, and other appliances)

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


Mechanical Characteristics

Case material

Unsaturated polyester
Tracking resistance: Level 0

Operating temperature range

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

Connection terminal type

FASTON tab terminal (#250)

Product mounting method

Place the product into a Φ25 hole and bring it into intimate contact with the motor

Electrical Characteristics

Rated voltage

AC 125/250V

Rated capacity

Up to 1.5 kW

Contact withstand current


Contact withstand count

10,000 times or more

Withstand voltage

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

Insulation resistance

100 MΩ or higher with a 500-VDC megohmmeter

Characteristics Unique to This Product

  • Set operating temperature: 100°C to 160°C
  • Set return temperature: 60°C to 70°C
  • Temperature tolerance: ±10°C
  • NA failsafe (with safety mechanism)