KSD301 Bimetal Disc Limit Thermostats : Function, Specification, Temp Switch

KSD301, 302 series snap-action are thermostats that use bimetallic discs (1/2″ disc) as temperature sensing components to control thermal cut-off switches. Electrical Rating: AC 125V max 15A~60A; AC250V 5A 10A 15A max 16A. Action Temperature: -30 °C~280 °C. When household & industrial appliances are working normally, the bimetallic strip is in a free state and the contacts are in a closed/open state. When the temperature reaches the action temperature, the bimetallic strip is heated to generate internal stress and quickly moves, opening/closing the contacts, cutting off/connecting the circuit, thereby playing a role in temperature control. When the appliance cools to the reset temperature, the contacts automatically close/open and resume normal working state.

KSD301 automatic reset & manual reset thermal switches

KSD301 normally open & normally closed action

KSD301 bimetallic discs temperature switches

KSD301 series bimetal thermostat is a kind of miniature hermetically sealed bimetal thermostat. It is of single-pole single-throw structure and works under resistive load. KSD301 bimetal thermostat is in wide use in a great variety of compact type home appliances with automatic reset or manual reset to provide temperature control or temperature protection.

KSD301 bimetallic snap disc thermostats are widely used in: water dispensers, water heaters, sandwich toasters, dishwashers, dryers, disinfection cabinets, microwave ovens, electric coffee pots, electric cookers, refrigerators, air conditioners, laminating machines, office equipment, car seat heaters and other electric heating appliances.

Technical parameters
1. Electrical parameters: 1) CQC, VDE, UL, CUL; AC250V 50~60Hz 5A / 10A / 15A / 20A / 25A / 30A / 40A / 50A / 60A (resistive load).
2) UL AC 125V 50Hz 15A~60A (resistive load).
2. Operating temperature range: -30℃~280℃ (optional), temperature accuracy: ±2 ±3 ±5 ±10℃.
3. Recovery and operating temperature difference: 8~100℃ (optional).
4. Wiring method: plug terminal 250# (bend 0~90° optional); plug terminal 187# (bend 0~90° optional, thickness 0.5, 0.8mm optional).
5. Service life: ≥ 100000 times.
6. Electrical strength: AC 50Hz 1800V for 1min, no flicker, no breakdown.
7. Contact resistance: ≤50mΩ.
8. Insulation resistance: ≥100MΩ.
9. Contact form: Normally closed type: temperature rises, contacts disconnect, temperature drops, contacts connect;
Normally open type: temperature rises, contacts connect, temperature drops, contacts disconnect.
10. Shell protection level: IP00.
11. Grounding method: connected to the grounding metal parts of the device through the metal shell of the thermostat.
12. Installation method: directly reinforce with screws.
13. Temperature operating range: -25℃ ∽ +240℃+1℃ ∽ 2℃

KSD301 control thermal cut-off switches

KSD301 1/2″ disc snap-action switches

KSD301 Bimetal Disc Limit Thermostats

Product features
It has the characteristics of stable performance, high precision, small size, light weight, high reliability, long life, and low radio interference.

302 series snap-action are thermostats

Notes
1. (KSD301 surface mount thermostat) When using contact temperature sensing surface mount for installation, the metal cover should be close to the installation surface of the controlled device to ensure the temperature sensing effect. Thermal conductive silicone grease or other thermal conductive media with similar performance should be applied to the temperature sensing surface.
2. Do not collapse, loosen or deform the top of the cover during installation to avoid affecting performance.
3. Do not allow liquid to penetrate into the thermostat, do not allow cracks to appear on the outer shell, and do not change the shape of the external terminal at will.
4. When the product is used in a circuit with a current of no more than 5A, a cable with a copper core section of 0.5-1㎜2 should be selected for connection; when used in a circuit with a current of no more than 10A, a cable with a copper core section of 0.75-1.5㎜2 should be selected for connection.
5. The product should be stored in a warehouse with a relative humidity of less than 90% and an ambient temperature below 40℃, which is ventilated, clean, dry, and free of corrosive gases.

Classification of KSD301:
It can be classified by temperature, material (bakelite/ceramic), or installation method (surface mount/nut fixing).
Classification by action nature: It can be divided into normally open & normally closed action, automatic reset & manual reset.