KA-311

Product nameKA-311

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

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
FASTON tab terminal (#187, #250)
Product mounting method

Fixed in place with M4 screws or by other means
39.5-mm to 40-mm interval

Electrical Characteristics

Rated voltage

AC 250/500V
Rated capacity

Up to 1.0 kW
Contact withstand current

30/20A
Contact withstand count

5,000 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
  •  
KA-313

Product nameKA-313

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
FASTON tab terminal (#250)
Product mounting method

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

Electrical Characteristics

Rated voltage

AC 250/500V
Rated capacity

Up to 2.2 kW
Contact withstand current

80/50A
Contact withstand count

3,000 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
  •  
KA-314

Product nameKA-314

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
Product mounting method

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

Electrical Characteristics

Rated voltage

AC 250/500V
Rated capacity

Up to 7.5 kW
Contact withstand current

200/150A
Contact withstand count

2,000 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
  •  
KA-315

Product nameKA-315

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

300/200A
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
  •  
KA-316

Product nameKA-316

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

Thread-fastening terminal
Product mounting method

Fixed in place with M5 screws or by other means
80-mm interval

Electrical Characteristics

Rated voltage

AC 250/500V
Rated capacity

Up to 37 kW
Contact withstand current

600/400A
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
  •  
KM-331

Product nameKM-331

Manual return version of KA-311
Protectors are returned manually

Basic Characteristics

Product summary

Detects overcurrent / locked rotor current and protects a motor from burnout
Performs manual return by pushing the button
Product purpose

Prevent burnout of general-purpose three-phase motors
Intended use

Various industrial motors
Used at points where they must not be automatically returned
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

None

Mechanical Characteristics

Case material

Phenolic resin
(UL 94, V-HB, CTI 175 or higher)
Operating temperature range

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

Solder incurved terminal
FASTON tab terminal (#187, #250)
Product mounting method

Fixed in place with M4 screws or by other means
39.5-mm to 40-mm interval

Electrical Characteristics

Rated voltage

AC 250/500V
Rated capacity

Up to 1.0 kW
Contact withstand current

30/20A
Contact withstand count

200 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: 0°C or less
  • Temperature tolerance: ±10°C
  •  
KM-333

Product nameKM-333

Manual return version of KA-313
Protectors are returned manually

Basic Characteristics

Product summary

Detects overcurrent / locked rotor current and protects a motor from burnout
Performs manual return by pushing the button
Product purpose

Prevent burnout of general-purpose three-phase motors
Intended use

Various industrial motors
Used at points where they must not be automatically returned
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

None

Mechanical Characteristics

Case material

Phenolic resin
(UL 94, V-HB, CTI 175 or higher)
Operating temperature range

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

Solder incurved terminal
FASTON tab terminal (#250)
Product mounting method

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

Electrical Characteristics

Rated voltage

AC 250/500V
Rated capacity

Up to 2.2 kW
Contact withstand current

80/50A
Contact withstand count

200 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: 0°C or less
  • Temperature tolerance: ±10°C
  •  

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