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The Thermostat Switch KSD301 bimetallic disc operates in a Normally Open (いいえ) configuration. This means the circuit is initially open (切断された) 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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私. 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:
定格電圧: AC250V (抵抗負荷) or AC 125V (UL standard)
定格電流: 5A/10A/15A (抵抗負荷)
Temperature performance:
Action range: 0℃~300℃ (カスタマイズ可能な), accuracy ±2℃~±10℃17
Reset and action temperature difference: 8℃~100℃ (adjustable)
Mechanical characteristics:
接触抵抗: ≤50mΩ, insulation resistance: ≥100MΩ13
電気的強度: AC 1800V/1min without breakdown
耐用年数: ≥100,000 times17 (some models up to 150,000 times2)
Physical characteristics
保護レベル: IP00 (no dust and water resistance)
配線方法: プラグイン端子 250# または 187# (angle 0°~90° optional)
設置方法: supports various structures such as movable ring, flat ring, aluminum cover with holes, 等.
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:
温度が上昇するにつれて, 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.
自動リセット:
Once the temperature drops below a certain level, バイメタリックディスクは元の形状に戻ります, 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. アプリケーションシナリオ
Householdアプライアンス: ウォーターサーバー, 電気魔法瓶, 電子レンジ, 消毒キャビネット, 電気ヒーター, コーヒーマシン, 等.
Industrial equipment: motor overheat protection, rectifier equipment, ラミネートマシン, car heated seats, etc.57.
Ⅲ. Detection method (determine whether it is normally open)
Multimeter detection:
室温で (below the action temperature): the resistance of the two pins should be infinite (開回路).
After heating (above the action temperature): the resistance value drops to tens of ohms (開回路).
Marking distinction: The product body is usually marked with “いいえ” (通常開) または “通常開”.
IV. 製品の利点
応答速度が速い, clean contact action without arcing57;
高い温度制御精度, strong reliability7;
Compact structure, strong adaptability17.
⚠️ Note: The actual selection needs to confirm the specific temperature threshold (such as 85℃, 95℃, 等) and the reset temperature difference. The parameters of different models may vary.