KSD301 Temperature Limit Switch

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

Parameters	‌Typical values	Remarks
Rated voltage/current	AC 250V / 5Una、10Una、15Una、16Una	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, coffee machines.
‌Industrial equipment‌: air conditioners, 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.

KSD301 Temperature Switch Parameters