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The Thermostat Switch KSD301 bimetallic disc operates in a Normally Open (아니요) 구성. This means the circuit is initially open (연결이 끊어졌습니다) at normal temperatures. When the temperature rises to a predefined threshold, the bimetallic disc bends, closing the circuit and allowing current flow.
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나. Core Features
Operation Principle
When the temperature rises to the set value, the contact automatically connects the circuit; when the temperature drops to the reset value, the contact automatically disconnects the circuit, which is the opposite of the normally closed type (disconnected when the temperature rises and connected when the temperature drops).
The bimetallic strip is heated and deformed to trigger the mechanism to achieve fast switching.
Technical Parameters
Electrical Specifications:
정격전압: 교류 250V (저항 부하) or AC 125V (UL standard)
정격 전류: 5A/10A/15A (저항 부하)
Temperature performance:
Action range: 0℃~300℃ (맞춤형), accuracy ±2℃~±10℃17
Reset and action temperature difference: 8℃~100℃ (adjustable)
Mechanical characteristics:
접촉 저항: ≤50mΩ, 단열성 저항: ≥100MΩ13
전기 강도: AC 1800V/1min without breakdown
서비스 수명: ≥100,000 times17 (some models up to 150,000 times2)
Physical characteristics
보호 수준: IP00 (no dust and water resistance)
배선 방법: 플러그인 터미널 250# 또는 187# (angle 0°~90° optional)
설치방법: supports various structures such as movable ring, flat ring, aluminum cover with holes, 등.
Normally Open State:
The KSD301 is designed to have its contacts in an open state when the surrounding temperature is below the specified operating temperature. This means the circuit connected to the KSD301 is broken, preventing current flow.
Temperature Trigger:
As the temperature increases, the bimetallic disc (made of two different metals bonded together) responds to the temperature change. The two metals expand at different rates, causing the disc to bend.
Circuit Closure:
When the temperature reaches the set point, the disc bends enough to close the circuit, establishing a connection between the contacts. This allows current to flow through the circuit.
자동 재설정:
Once the temperature drops below a certain level, 바이메탈 디스크는 원래 모양으로 돌아갑니다, opening the circuit again and cutting off the current flow. This is an automatic reset feature.
In essence, the KSD301 is used as a thermal switch to control current flow based on temperature, acting as a temperature sensor and protector for various applications.
II. 응용 프로그램 시나리오
Household Appliances hold: 물 디스펜서, 전기 열, 전자레인지, 소독 캐비닛, 전기 히터, 커피 머신, 등.
Industrial equipment: motor overheat protection, rectifier equipment, 라미네이팅 기계, car heated seats, etc.57.
III. Detection method (determine whether it is normally open)
Multimeter detection:
실온에서 (below the action temperature): the resistance of the two pins should be infinite (open circuit).
After heating (above the action temperature): the resistance value drops to tens of ohms (open circuit).
Marking distinction: The product body is usually marked with “아니요” (평상시 열림) 또는 “평상시 열림”.
IV. 제품 장점
빠른 응답 속도, clean contact action without arcing57;
고온 제어 정확도, strong reliability7;
컴팩트한 구조, strong adaptability17.
⚠️ Note: The actual selection needs to confirm the specific temperature threshold (such as 85℃, 95℃, 등.) and the reset temperature difference. The parameters of different models may vary.