通常開放的是什麼 (不) 恆溫器開關KSD301?

The Thermostat Switch KSD301 bimetallic disc operates in a Normally Open (不) configuration. This means the circuit is initially open (斷開連接) at normal temperatures. When the temperature rises to a predefined threshold, the bimetallic disc bends, closing the circuit and allowing current flow.

Normally open THERM-O-DISC T-O-D THERMAL LIMIT SWITCH L160-40F 60TX01

UL/CUL KSD301 Shutoff Thermostat,Normally Open NO Bimetal Snap Disc 125V 16A Auto Reset

UXCELL KSD301恆溫器40°C/104°F 10A通常打開N.O調整快照溫度開關

我. 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:
額定電壓: AC 250V (阻斷性負載) or AC 125V (UL standard)
額定電流: 5A/10A/15A (阻斷性負載)
‌Temperature performance‌:
Action range: 0℃~300℃ (可客製化), accuracy ±2℃~±10℃17
Reset and action temperature difference: 8℃~100℃ (adjustable)
‌Mechanical characteristics‌:
接觸電阻: ≤50mΩ, insulation resistance: ≥100MΩ13
電氣強度: AC 1800V/1min without breakdown
使用壽命: ≥100,000 times17 (some models up to 150,000 times2)

‌Physical characteristics‌
防護等級: 防護等級00 (no dust and water resistance)
接線方式: 插入式終端 250# 或者 187# (angle 0°~90° optional)
安裝方法: supports various structures such as movable ring, flat ring, aluminum cover with holes, ETC.

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.

自動復位:
Once the temperature drops below a certain level, 雙金屬盤恢復其原始形狀, 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.

二. 應用場景
‌家用電器‌: 飲水機, 電熱水瓶, 微波爐, 消毒櫃, 電暖器, 咖啡機, ETC.
‌Industrial equipment‌: motor overheat protection, rectifier equipment, 層壓機, car heated seats, etc.57.

三、. Detection method (determine whether it is normally open)
‌Multimeter detection‌:
室溫下 (‌below the action temperature‌): the resistance of the two pins should be infinite (開路).
After heating (‌above the action temperature‌): the resistance value drops to ‌tens of ohms‌ (開路).
‌Marking distinction‌: The product body is usually marked with “不” (常開) 或者 “常開”.

四號. 產品優勢
反應速度快, clean contact action without arcing57;
控溫精度高, strong reliability7;
結構緊湊, strong adaptability17.

⚠️ Note: The actual selection needs to confirm the specific temperature threshold (such as 85℃, 95℃, ETC。) and the reset temperature difference. The parameters of different models may vary.