KSD301 NC Thermostat Normally Closed Temperature Control Switch
Manufactured with durable materials and a compact design, the KSD301 NC thermostat offers long service life and excellent thermal sensitivity. It is widely used in gas and electric water heaters, household appliances, kitchen equipment, and industrial heating systems. Easy to install and highly dependable, this thermostat switch provides enhanced safety and efficient temperature regulation for both residential and commercial equipment.
Features
-
Normally Closed (NC) Design
Automatically cuts off the circuit when the preset temperature is reached, providing reliable overheating protection. -
High Sensitivity & Fast Response
Bimetal structure ensures quick temperature detection and accurate switching. -
Stable & Reliable Performance
Maintains consistent operation under repeated heating and cooling cycles. -
Durable Construction
High-quality metal housing offers good heat resistance and long service life. -
Wide Application Compatibility
Suitable for gas water heaters, electric water heaters, household appliances, and industrial heating equipment. -
Compact Size, Easy Installation
Standard KSD301 structure allows quick integration into existing systems.

Product Parameter
| Item | Specification |
|---|---|
| Model | KSD301 |
| Contact Type | Normally Closed (NC) |
| Action Type | Bimetal snap-action |
| Rated Voltage | AC 125V / 250V |
| Rated Current | 10A / 16A |
| Temperature Range | 40°C – 180°C (customizable) |
| Temperature Tolerance | ±5°C |
| Reset Type | Automatic reset |
| Housing Material | Metal / Stainless steel (optional) |
| Terminal Type | 6.3mm terminals / customized |
| Service Life | ≥100,000 cycles |
| Application | Water heaters, ovens, heaters, appliances |
FAQ
Q1: What does NC mean in the KSD301 thermostat?
A: NC stands for Normally Closed. The circuit remains closed during normal operation and opens automatically when the set temperature is reached.
Q2: Is the temperature setting customizable?
A: Yes, the temperature cutoff point can be customized according to application requirements.
Q3: Can this thermostat be used in gas water heaters?
A: Yes, it is widely used in gas water heaters, electric water heaters, and other heating appliances.
Q4: Does the KSD301 thermostat reset automatically?
A: Yes, this model features an automatic reset function after the temperature drops to a safe level.
Q5: What is the service life of this thermostat?
A: The KSD301 thermostat is designed for long-term use, with a service life of over 100,000 switching cycles.




