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KSD301 Temperature Limit Switch
KSD301 realizes temperature control through bimetallic temperature sensing element: When the temperature of the equipment reaches the preset action temperature, the bimetallic strip is deformed by heat and instantly drives the contact to disconnect the circuit; after the temperature drops to the reset temperature, the contact automatically closes and resumes power.
KSD301 is a widely used bimetallic temperature-controlled Limit switch, mainly used for overheat protection or temperature control of electrical equipment. Its main features and information are as follows:
I. Core Principle
KSD301 realizes temperature control through bimetallic temperature sensing element: When the temperature of the equipment reaches the preset action temperature, the bimetallic strip is deformed by heat and instantly drives the contact to disconnect the circuit; after the temperature drops to the reset temperature, the contact automatically closes and resumes power.
II. Key Parameters
| Parametri |
Typical values | Remarks |
| Rated voltage/current | AC 250V / 5A、10A、15A、16A | Applicable to resistive loads |
| Action temperature range | 40°C–250°C | 5°C steps available |
| Temperature accuracy | ±2℃、±3℃、±5℃、±10℃ | Depending on the model |
| Reset temperature difference | 8–100℃ (customizable) | Action and reset temperature difference |
| Contact resistance | ≤50mΩ | |
| Insulation resistance | ≥100MΩ | |
| Mechanical life | ≥100,000 times |
 KSD301 Temperature Limit Switch |
 KSD301 Temperature Switch |
 Dimensional parameters of KSD301 temperature switch |
III. Specifications and Types
Contact Form
Normal Closed (NC): The contact disconnects when the temperature rises (most commonly used).
Normal Open (NO): The contact connects when the temperature rises.
Mounting Structure
Bent-leg/flat-angle terminals are optional (remarks are required when placing an order).
Enclosure protection level: IP00 (metal enclosure grounded).
IV. Typical Applications
Household appliances: water dispensers, rice cookers, disinfection cabinets, microwave ovens, strojevi za kavu.
Industrial equipment: klima uređaji, laminators, electric heating appliances.
Automotive field: diesel filter heating system.
V. Procurement and selection
Temperature marking: The required operating temperature (such as 85°C, 125° C) and contact type must be specified when purchasing.
Tip: The operating temperature tolerance and reset temperature difference must be confirmed according to the specific model. The tolerance of some high-precision models is as low as ±2°C.
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