Ksd301 16A Bimetal Thermostatl Temperature Switch for Water Heaters

Product Description

PRODUCT SPECIFICATION

Product Name	KSD301
Rated Voltage	250V AC
Rated Current	10A/16A
Reset Type	Auto Reset
Contact Type	Normally Closed(NC)/Normally Open(NO)
Shell Type	Plastic case/Iron case
Lead Style	Wire Lead
Wire Lenght	Customizable
Insulation System	Optional
Action Temperature	45℃~275℃
Tolerance	±5℃~±10℃(Optional)
Electrical Life	10,000 ~50,000 cycles
Insulation Resistance	50MΩ
Dielectric Strenght	1500VAC/1MIN

KSD301 Thermal Protector | Bimetal thermostat Manufacturer | JAFLY

1.The KSD301 10A/16A bimetal thermostat is a compact snap-action thermal switch designed for reliable temperature control and overheat protection in household appliances, heating equipment and compact electrical devices.

2.Using a temperature-sensitive bimetal disc, the KSD301 thermostat changes the circuit state at a preset temperature. It can control heating cycles, disconnect power during abnormal overheating or activate a circuit according to the selected contact configuration.

3.KSD301 bimetal thermostats are commonly used in coffee makers, water dispensers, electric kettles, toasters, microwave ovens, electric heating pads, portable refrigerators, compact freezers and other appliances that require stable temperature control or thermal safety protection.

4.When the mounting surface reaches the specified operating temperature, the internal bimetal disc snaps quickly to actuate the contacts. In a normally closed (NC) configuration, the KSD301 thermal protector opens the circuit at the preset temperature to help reduce overheating risk. In a normally open (NO) configuration, it closes the circuit at the selected temperature for temperature control applications.

5.Depending on the required function, KSD301 thermostats can be supplied with automatic reset, manual reset, normally closed or normally open contact options. Action temperature, reset temperature, terminal type, mounting bracket, insulation material and lead configuration can be selected to match different appliance designs.For motor, fan, water pump, transformer or other inductive-load applications, the final KSD301 configuration should be selected according to the actual voltage, current, inrush current, mounting position, operating temperature and applicable safety requirements.

Action Temperature Range: 45°C to 275°C

JAFLY thermal protectors are available with action temperatures from 45°C to 275°C, providing reliable overheat protection for motors, transformers, heating appliances and electrical equipment. The required trip temperature can be selected or customized according to the application, operating conditions and safety requirements.

What is the thermal protector?

The thermal protector is an automatic-reset bimetal thermal switch designed to help protect motors and electrical equipment from overheating. Heat generated by the protected component is transferred to the internal bimetal element. When the preset action temperature is reached, the bimetal element snaps and separates the electrical contacts, interrupting the circuit to help prevent further temperature rise.After the equipment cools down to the reset temperature, the bimetal element returns to its original position and the contacts close automatically, restoring power without manual operation. With a compact structure, reliable contact system and customizable action temperatures, the KSD301 thermal protector is widely used for motor protection in pumps, fans, transformers, household appliances and other electrical equipment.

Inside the Thermal Protector

Precision Bimetal Element
Responds rapidly to abnormal heat for accurate thermal protection and reliable trip performance.
Silver Alloy Contact System
Provides stable conductivity and reliable circuit interruption during overheating conditions.
Compact 10 mm Design
Compact structure for easy integration into motor windings, pumps, fans and small electrical appliances.
High-Fatigue Contact Spring
Maintains consistent contact pressure for dependable switching and automatic reset performance.
How It Works:
Heat rises → bimetal element snaps → contacts open → power is interrupted → temperature drops → contacts reset automatically.

FAQ

What is the thermal protector?

How does a automatic reset Bimetal thermostat work?

The thermal protector is a compact bimetal thermal switch designed to protect motors, transformers, pumps, fans and electrical appliances from overheating. It opens the electrical circuit when the protected component reaches the preset action temperature.

The thermal protector uses an internal bimetal element to sense temperature. When abnormal heat causes the protector to reach its preset action temperature, the bimetal element snaps and opens the contacts to interrupt power. After the temperature drops to the reset temperature, the contacts close automatically and power is restored.

What is the difference between action temperature and reset ?

Is Bimetal thermostat suitable for motor protection?

The action temperature is the temperature at which the thermal protector opens the circuit. The reset temperature is the temperature at which the protector closes the circuit again after cooling. Both values should be selected according to the actual operating temperature and safety requirements of the application.

Yes. Bimetal thermostat is widely used as a motor protector in electric motors, pumps, fans, vacuum cleaners, power tools and household appliances. It is commonly installed close to the motor winding or heat source to provide responsive overheat protection.

Can thermal switch be used as overcurrent protector?

How do I choose the correct thermal protector?

Thermal switch is primarily a temperature protection device rather than a standalone fuse. It responds to heat generated by overload, locked rotor conditions or abnormal operation. For applications requiring direct overcurrent protection, it should be used together with suitable electrical protection components where necessary.

When selecting a thermal protector, consider the action temperature, reset temperature, rated voltage, rated current, protected component temperature, installation position, case type, lead wire specification and insulation requirements. The selected temperature should be based on the actual operating temperature of the motor or electrical equipment.

Can thermal protectors be customized?

What is the difference between plastic case and metal case?

Yes. JAFLY can provide customized thermal protectors with different action temperatures, lead wire lengths, wire materials, insulation sleeves, casing types, terminal options and product markings according to application requirements.

Plastic case thermal protectors are commonly used where electrical insulation and compact installation are important. Metal case versions can provide different heat transfer and mounting characteristics. The suitable option depends on the motor structure, installation location and insulation requirements.