I. Product Overview
The KSD302 series thermostat is a bimetallic strip temperature controller with a fully enclosed housing and a 1/2-inch bimetallic strip disc snap-action design, specifically designed to meet the needs of high-power devices such as electric water heaters and electric heating appliances.
The product utilizes the principle of thermal expansion and contraction of bimetallic strips. When the temperature reaches the preset value, the disc-shaped element jumps instantaneously, and the contact moves quickly through the mechanism to connect or disconnect the circuit, thus providing safety protection for electrical appliances.
This series offers both automatic and manual reset control modes, and can be equipped with either bakelite or ceramic housings to meet different application scenarios and cost requirements.
II. Product Features and Advantages
- 1/2-inch bimetallic disc snap-action structure: It adopts a temperature-sensitive bimetallic strip to achieve rapid contact action (snap-action) to ensure that the circuit can be switched quickly when the temperature exceeds the limit, with crisp action and no arcing.
- Single-pole single-throw (SPST) contact structure: The SPST contact design is simple and reliable, and is suitable for conventional on/off control scenarios.
- Dual-shell material options available:
- Bakelite housing: An economical solution suitable for normal temperature conditions.
- Ceramic housing: superior high-temperature resistance, suitable for high-temperature environments.
- Dual reset options are available:
- Automatic reset type: It automatically resumes conduction after the temperature drops to the reset temperature, and is suitable for conventional temperature control scenarios.
- Manual reset type: Manual intervention is required to reset after troubleshooting. It is suitable for overheat protection scenarios with higher safety requirements.
- Contact types: Both normally open (closes when temperature is reached) and normally closed (opens when temperature is reached) versions are available.
III. Application
- Instant electric water heaters and storage electric water heaters
- Electric heating appliances such as rice cookers, water dispensers, and microwave ovens
- Electric heating equipment, electric welding machine
- Steam heaters, boilers
- High-power mechanical equipment and electrical products
IV. Main Technical Parameters
| Parameter Items | Specifications |
| Model | KSD302 series |
| Contact structure | Single-Pole Single-Throw (SPST) |
| Contact form | Normally open / Normally closed (optional) |
| Reset method | Automatic reset / Manual reset (optional) |
| Shell material | Bakelite housing / Ceramic housing (optional) |
| Temperature sensing element | 1/2-inch bimetallic disc |
| Rated electrical parameters | AC 250V / 35A, 30A, 25A |
| Operating temperature range | 45℃ ~ 150℃ (Customized according to customer requirements) |
| Operating temperature tolerance | ±3℃ ~ ±5℃ |
| Service life | Automatic reset type: ≥6,000 times; Manual reset type: ≥6,000 times |
| Certification | Bakelite housing: CQC16002160616; Ceramic housing: CQC18002203323 |
V. Installation Method
Installation method: Use contact temperature sensing installation, ensuring the metal cover is in close contact with the mounting surface of the controlled appliance. To ensure effective temperature sensing, it is recommended to apply thermal grease to the sensing surface.
Precautions:
- Do not deform or collapse the cover during installation, as this may affect performance.
- To prevent electrical leakage, avoid liquid from seeping into the thermostat and ensure that the casing is free of cracks.
- Please connect the wires correctly according to the markings on the casing.
