Durable 20A 250VAC Ksd302/303 Snap Action Thermostat for Commercial Water Heaters

• Customization: Available
• Certification: CQC
• Display Type: Ksd302/303 Thermostat
• Model NO.: KSD-1401
• Rated Voltage: AC 250V
• Rated Current: 20A/25A/30A (Resistive Load)
• Operating Temperature Range: 60℃~200℃
• Temperature Tolerance: ±3℃/±5℃/±8℃
• Reset Temperature Difference: 10℃~25℃ (Customizable).
• Protection Rating: IP40 (Dustproof/Moistureproof)
• Insulation Strength: AC 50Hz 2000V/1min (No Breakdown)
• Insulation Resistance: ≥100MΩ (DC 500V Megohmmeter).
• Contact Resistance: ≤50MΩ
• Service Life: ≥100,000 Cycles Under Resistive Load.
• Transport Package: Carton Packaging
• Specification: AC 250V
• Trademark: Thermal International
• Origin: China
• HS Code: 9032100000
• Production Capacity: 80, 000PCS/Week
• Package Size: 36.00cm * 25.00cm * 30.00cm
• Package Gross Weight: 7.800kg

Product Description

Product Description

Durable 20A 250VAC KSD302/303 Snap Action Thermostat for Commercial Water Heaters

This KSD302/303 model is a snap-action bimetallic thermostat. 
Its core working principle is based on the difference in thermal expansion coefficients of the bimetallic strips, combined with mechanical transmission to achieve rapid circuit switching. Specifically, it consists of two stages: temperature-triggered disconnection and cooling-reset closure. 

Compared to the standard KSD301 model, the core principle is the same, but this enhanced model has a more stable transmission structure: it uses a ceramic actuator instead of the plastic transmission component of the KSD301, offering higher high-temperature resistance and mechanical strength. In high-power/high-temperature scenarios, it avoids contact failure caused by deformation of the transmission component.

In short:

it is an "upgraded version" of KSD301, which is more durable and adaptable to a wider range of scenarios (especially high-power/high-temperature/humidity equipment).

Specification

Basic Parameters:
Product Description	Bimetallic Snap Action Thermostat
Model Number	KSD302/303 (High-power version with metal bracket)
Working Principle:	Bimetallic strip snap-action (temperature-sensitive deformation triggers on/off switching)
Contact Type	Normally closed (default closed, disconnects over-temperature; automatically resets after temperature drop).
Electrical Specifications:
Rated Voltage	AC 250V (some models support AC 400V)
Rated Current	20A/25A/30A (resistive load)
Temperature Range	Operating Temperature: 60℃~200℃ (one specification in 5℃ increments, e.g., 80℃/90℃/100℃, etc.) Temperature Tolerance: ±3℃/±5℃/±8℃ Reset Temperature Difference: 10℃~25℃ (Customizable)
hysical and Environmental Parameters:
Housing Material	Metal + Ceramic / High-Temperature Resistant Engineering Plastic
Heat Resistance	Long-term operating temperature ≤200℃, mounting surface temperature ≤220℃
Protection Rating	IP40 (Dustproof / Moistureproof)
Installation Method	Metal bracket + dual mounting holes (for screw fixing)
Dimensions	Approx. 40mm × 30mm × 15mm (Metal cover diameter ≈ 25mm)
Performance Parameters
Service Life	≥100,000 cycles under resistive load (auto-reset type)
Insulation Strength	AC 50Hz 2000V/1min (no breakdown)
Insulation Resistance	≥100MΩ (DC 500V megohmmeter)
Contact Resistance	≤50mΩ

Below is a selection and matching table for this product (recommended temperature/current for different devices).

Equipment type	Recommended operating temperature	Recommended rated current	Reason for compatibility
Commercial water heaters	85℃/90℃	25A/30A	High-power heating, requiring high temperature resistance and high current.
Industrial mini heaters	120℃/150℃	20A/25A	High-temperature operating environment, requiring high heat resistance.
Bathroom fan heaters	80℃/85℃	20A	Humid environment, requiring IP40 protection and overheat protection.
Commercial (small) ovens	180℃/200℃	25A	High-temperature baking scenarios, suitable for 200℃ tolerance.
High-power electric irons	160℃/180℃	20A	Rapid heating equipment, requiring precise temperature control.

Product Pictures

Workshop Pictures

Packing & Delivery

Certifications

FAQ

FAQ

Q1 Are you trader? 
A1 We are factory.
 
Q2 What's your lead time for 5000pcs?
A2 We need around 20days after down payment received. .
 
Q3 You payment term?
A3 We accept LC, T/T 20% remittance +80% before delivery, DP.
 
Q4 Can we print our LOGO on heating element?
A4 Yes.
 
Q5 Do you offer guarantee? 
A5 Yes. We offer 1 year guarantee.