KSD301 Temperature Controller (KSD302, KSD303) - Thermal Fuse Temperature Switch
The KSD series thermostat operates on the principle of bimetal discs that snap into action when temperature changes occur. This snap action activates the internal contacts, either completing or breaking the electrical circuit. These temperature controllers feature fixed working temperatures, reliable snap action, minimal flashover, long service life, and reduced radio interference.
KSD303 Thermostat Specifications
Voltage & Current: AC 125V max 15A; AC250V 5A 10A 15A max 16A
Action Temperature: 0~250℃
Recovery/Action Temp Difference: 0 to 25 degrees (or custom)
Temperature Deviation: ±3/±5/±10°C (or custom)
Circuit Resistance: ≤50mΩ (Initial value)
Insulation Resistance: AC50Hz 1500V/min, no breakdown (Normal State)
Life Cycle: ≥100,000 operations
Contact Type: Normally closed or Normally open
Mounting Bracket: Movable or immovable
Terminal Type: 187 series (4.8*0.5mm/4.8*0.8mm) or 250 series (6.3*0.8mm)
Terminal Angle: 0~90°C optional
Housing: Plastic or ceramic
Temperature Sensor Face: Aluminum cap or copper head
KSD301 Auto Reset vs Manual Reset Types
Manual Reset Type
When temperature reaches the action range, the bimetallic strip snaps to disconnect. The circuit remains open until manually reset by pressing the reset button after temperature decreases by 20°C. Requires 4-6N force for reset. Minimum 20.4mm clearance required between reset button and cover for proper operation.
Auto Reset Type
Automatically resets and resumes operation when temperature decreases to the reset point after activation.
KSD301 Bimetal Thermostat Applications
Widely used for temperature control in household appliances including:
- Coffee pots
- Automatic toasters
- Laminators
- Electric water pots
- Steam guns
- Steam irons
- Wind warmers
- Microwave ovens
- Water dispensers
Temperature Settings
| Open Temp. |
Reset Temp. |
Open Temp. |
Reset Temp. |
Open Temp. |
Reset Temp. |
| -20℃±5℃ |
5℃±5℃ |
95℃±5℃ |
80℃±5℃ |
205℃±5℃ |
175℃±10℃ |
| -15℃±5℃ |
5℃±5℃ |
100℃±5℃ |
80℃±10℃ |
210℃±5℃ |
180℃±10℃ |
| Custom temperature settings available according to client requirements |
Product certifications: UL, CQC, TUV and RoHS approved.
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