A Bimetal Thermostat Manufacturer Shaping the Future

Asahi Keiki Co., Ltd.
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Product

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US-639

  • Splash-proof type
  • Flat type
  • Compact flat type
  • Flat type

Snapper, Snap-action

Features
Heat-resistant resin body. Waterproof performance achieved through resin filling.
Uses
Steering wheel heaters, water heaters, vending machines, motors, etc.
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Environmentally Friendly Components / RoHS-Compliant Products

Product photos

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  • 639_0136
  • 639_0141
  • 639_0143

Thermostat Specifications

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Electrical Rating (Resistive Load) AC125V MAX.8A(Min.200mA)
AC250V MAX.4A(Min.200mA)
DC 12V MAX.8A(Min.200mA)
DC 24V MAX.4A(Min.200mA)
Temperature Setting Range 50 to 100℃ (in 5°C increments)
Temperature Setting Tolerance (Operate/Reset) ±5℃,±7℃,±10℃/ ±15℃
Differential (Standard) 40K (Standard)
Circuit Resistance (Initial Value) 70mΩ max. (varies depending on lead wire length)
Insulation Resistance 100MΩ min. (with DC500V megohmmeter)
Dielectric Strength AC1200V / 1 min. (DC specification) AC1500V / 1 min. (AC specification)
Heat Resistance 100℃ (excluding lead wire)
Cold Resistance -20℃
Switching Endurance 6,000 cycles or more

Please contact us separately regarding specifications that exceed these.

Thermostat Model Code

US-639

12345

1Contact Material

A : Ag alloy contact

2Contact Type

X : "OFF" when temperature rises

3Case Type

A : AC specification White (thickness 3.8mm)
D : DC specification Black (thickness 3.8mm)

4Lead Wire Type

A2 : Cross-linked polyethylene insulated wire (AC specification) [UL3398 White L=70㎜]
D2 : Cross-linked polyethylene insulated wire (DC specification) [UL3398 Black L=70㎜]

5Lead Wire Conductor Size

2 : AWG♯20
Model Examples
  • US-639AXAA22

    Ag alloy contacts, cross-linked polyethylene-insulated wire (AC specification), 70 mm, AWG #20

Thermostat Dimensions

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Please feel free to contact us with any questions about our products.

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