4-Pin Ksd302 Snap Action Thermostat for Commercial Water Heaters/Bathroom Heaters

Product Description

Product Description

4-Pin KSD302 Snap Action Thermostat for Commercial Water Heaters/Bathroom Heaters

The core differences between this 4-Pin KSD302 model and the regular KSD301 model lie mainly in the contact structure, functional expandability, and applicable scenarios, as detailed below:

1. Contacts and Wiring Method
Regular KSD301: Mostly 2-pin/3-pin, supporting only single-circuit switching (simple "power → load" control);
This KSD302: 4-pin design, including 2 sets of independent normally closed contacts (or "1 set of normally closed + 1 set of normally open"), capable of simultaneously controlling the main circuit + signal circuit (e.g., "triggering an alarm while power is off"), offering greater functional expandability.

2. Current Bearing and Applicable Power
Regular KSD301: Rated current is mostly 10-16A, suitable for low-power devices (such as water dispensers, small ovens);
This KSD302: Rated current can reach 20-25A, capable of handling higher power (such as commercial water heaters, industrial heaters), and the contacts are made of copper alloy, offering stronger wear resistance and arc resistance.

3. Installation and Protection Design

Standard KSD301: Primarily features a small metal cover and pins, easy to install but with weak stability and low enclosure protection (basic dustproof).

This KSD302: Features a metal flange bracket and dual mounting holes, providing a more secure fixation (suitable for vibrating equipment) and better enclosure sealing (IP40 dustproof/moistureproof), suitable for humid/high-temperature environments (such as bathroom appliances).

4. Functions and Reset Method

Standard KSD301: Only supports automatic reset (automatic closure after cooling following over-temperature disconnection).

This KSD302: Some models support a manual reset option (manual pressing is required after over-temperature disconnection for added safety and to prevent repeated restarts).

5. Temperature Control Accuracy

Standard KSD301: Temperature tolerance is mostly ±5℃.

This KSD302: Temperature tolerance can reach ±3℃, providing more precise temperature control and suitable for temperature-sensitive equipment (such as precision heaters). In short, it is an "extended version" of the KSD301, which is more suitable for equipment that requires multi-loop control, high power load, and high protection.

Specification

Product Description	Bimetallic Snap Action Thermostat
Model Number	KSD302
Rated Voltage	AC 250V (some models support AC 400V)
Rated Current	15A/20A/25A (resistive load)
Contact type	Double-pole double-throw (4 pins corresponding to 2 sets of normally closed contacts)
Temperature Range	Operating Temperature: 60℃~150℃ (each 5℃ increment is a different specification, such as 85℃/90℃/95℃, etc.) Temperature Tolerance: ±3℃/±5℃ (High-precision model available upon request) Reset Temperature Difference: 10℃~25℃ (default)
Housing Material	Bakelite/Ceramic (High Temperature Resistant) + Metal Flange Bracket
Heat Resistance Temperature	Long-term ≤150℃, short-term (≤15min) ≤180℃.
Protection Rating	IP40 (Dustproof / Moistureproof)
Pin type	4-pin through-hole type (pitch 5mm~7mm)
Dimensions	Main body diameter ≈ 25mm, bracket width ≈ 40mm
Installation Method	Metal bracket + dual mounting holes (compatible with M3/M4 screws)
Interference immunity	No arcing, low radio interference.
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

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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.