M4 Screw Thermostats

M4 Screw Thermostat is a temperature control switch that uses the principle of bimetallic strips. It is widely used in home appliances, heating equipment, power tools and other fields. Its working principle is based on the deformation of the bimetallic strip under temperature changes, and the contact action realizes the opening and closing of the circuit. This temperature control switch usually has an M4 threaded interface for easy mechanical fixation with the equipment. Common models include KSD301 and H31 series, with rated voltages up to 250V and rated currents of 10A or 15A. Its operating temperature range is usually between 45℃ and 270℃, with automatic reset or manual reset functions. The shell material is mostly phenolic resin or ceramic to ensure good insulation performance and high temperature resistance. In addition, the contact type of the temperature control switch can be selected as normally open (NO) or normally closed (NC) to meet different application requirements.

M4 Screw Thermostats KSD301

Stable electrical performance
M4 Screw Thermostats have a rated voltage of 250V and a rated current of 10A. Their electrical performance complies with multiple international standards such as EN 60730-1:2012 and UL873. In actual use, the contact resistance is less than 50mΩ, which can reduce energy consumption and heat generation and improve conduction efficiency. At the same time, its insulation resistance is greater than 100MΩ, which effectively avoids leakage and short circuit risks. The product can withstand a voltage shock of no less than 1500V for 1 minute. It has a high level of insulation withstand voltage and is suitable for a variety of power environments with strict safety requirements.

High temperature control accuracy
The operating temperature of the temperature control switch is X±5°C (if set to 110°C, the actual operating range is 105°C~115°C), and the reset temperature is a manual reset type, which has the ability to accurately control the overheating threshold. The error control of plus or minus 5°C meets the basic requirements of the IEC 60730-2-9 standard for temperature control accuracy of household and industrial equipment. This level of accuracy can ensure the accuracy of thermal protection action, avoid premature power failure or overheating failure of equipment due to temperature control error, and improve the stability and safety of system operation.

Long-life design meets high-frequency operation requirements
According to product specifications, the mechanical life of M4 Screw Thermostats reaches 10,000 times (UL, TUV) and 6,000 times (CQC) under TUV and UL standards respectively. This data shows that its internal bimetallic strip can still maintain sensitive action and consistent response after experiencing long-term thermal expansion and contraction cycles, and is suitable for control environments with frequent start and stop. For example, in a continuously operating device, if it is operated 10 times a day, the theoretical service life can reach nearly 3 years, which is better than most ordinary temperature control products on the market. The qualified standard of high cycle number is an important guarantee for its long-term reliable operation.

Easy to integrate and maintain
The thermostat adopts M4 screw structure design, and the installation method is standardized, which is convenient for quick fixation in various equipment structures without additional tooling. Its shell design meets the IP00 protection level. Although it is not dustproof and waterproof, it has no effect when used in an internal closed environment. The compact size and standardized screw connection form reduce the assembly error during the integration process, improve maintenance efficiency and replacement convenience, and are particularly suitable for electrical appliances and equipment with limited volume but high performance requirements for temperature control components.

Electrical performance:
Technology Specification
Electric Performance:
Rated Voltage/Current):250V10AIP
Protection Degree:IP00
0peration Cycles:CQC;6000UL,TUV 10000
Resistance of Contact:<50Mq
Resistance of Insulated:>100MQ
Test Voltage:≥1500V/1min (Normality)

Temperature: X+/-5,Open temperature: X+/-5
Reset temperture: manual
Relevant Standards:
UL873, CSA C22.2 NO 24-93EN 60730-1 2012-10EN 60730-2-9:2011-07
GB14536.1-2008 IEC 60730-1-2008GB14536.10-2008 IEC 60730-2-9-2010\
4. Certificate No
CQC: CQC11002060639
TUV: 50432319
UL: E251340

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