Bimetallic Thermostat Snap-Action Thermal Cut Off Switch
The KSD series thermostat operates on the principle of bimetal discs snapping into action when sensing temperature changes. This snap action activates internal contacts to open or close circuits. Key features include fixed working temperatures, reliable snap action, minimal flashover, extended lifespan, and reduced radio interference.
KSD304 Thermostat Specifications
| Voltage & Current |
AC 125V max 15A; AC250V 5A 10A 15A max 16A |
| Action Temperature |
0~250℃ |
| Recovery and action temperature difference |
0 to 25 degrees, or according to client's request |
| Temperature deviation |
±3 / ±5 / ±10 degree or according to client's request |
| Circuit resistance |
≤50mΩ (Initial value) |
| Insulation resistance |
AC50Hz 1500V / min, no breakdown blinding (Normal State) |
| Life cycle |
≥100000 times |
| Contact type |
Normally closed or Normally open |
| Mounting bracket |
Movable or immovable |
| Terminal type |
187series of 4.8*0.5mm and 4.8*0.8mm, 250 series of 6.3*0.8mm |
| Terminal Angle |
Bending angle: 0~90°C optional |
| Housing |
Plastic or ceramic |
| Temperature sensor face |
Aluminum cap or copper head |
KSD304 Auto Reset vs Manual Reset Types
Manual Reset Type
When temperature reaches the action range, the bimetallic strip quickly disconnects. The circuit remains open until manually reset by pressing a button (4-6N force recommended). Requires temperature to decline 20°C before resetting. Minimum 20.4mm clearance required between reset button and cover.
Auto Reset Type
Automatically resets when temperature declines to specified point, without manual intervention.
KSD304 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℃ |
Product holds UL, CQC, TUV and RoHS certifications.
KSD301 Temperature Protector
Principle and Structure
Operates similarly to KSD304 with bimetal disc snap action mechanism, featuring fixed working temperatures, reliable operation, and long service life.
Specifications
- Electrical Rating: AC 125V max 15A; AC250V 5A 10A 15A max 16A
- Action Temperature: -10~300℃
- Temperature deviation: ±3/±5/±10℃ or custom
- Insulation resistance: ≥100mΩ (DC500V Normal State)
- Life cycle: ≥100,000 operations
Applications include coffee pots, toasters, electric water pots, steam irons, microwave ovens, and other household appliances.
Product holds UL, CQC, VDE and RoHS certifications.
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