塑殼斷路器一般適用于供電系統400V供電與低壓配電系統的總進線端處接口，在地鐵站被廣泛運用于二級負荷小動力電源配電箱、三級負荷小動力電源配電箱、雙電源切換箱、消防控制柜以及MCC柜系統中;車輛段和區間所部分低壓配電系統也使用了塑殼斷路器。地鐵站低壓配電系統中使用的斷路器的型號一般是VL160、VL250等，表示額定電流為160A、250A。

Moulded case circuit breaker is generally applicable to the interface between 400V power supply of power supply system and main incoming line end of low-voltage distribution system. It is widely used in secondary load small power supply distribution box, tertiary load small power supply distribution box, dual power switch box, fire control cabinet and MCC cabinet system in Metro Station; Moulded case circuit breakers are also used in some low voltage distribution systems of depot and section post. The type of circuit breaker used in the low-voltage distribution system of subway station is generally vl160, vl250, etc., indicating that the rated current is 160A, 250A.

塑殼斷路器的工作原理

Working principle of moulded case circuit breaker

低壓斷路器的主觸點是靠手動操作或電動合閘的。主觸點閉合后，自由脫扣機構將主觸點鎖在合閘位置上。過電流脫扣器的線圈和熱脫扣器的熱元件與主電路串聯，欠電壓脫扣器的線圈和電源并聯。

The main contact of low voltage circuit breaker is manually operated or electrically closed. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the over-current release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the under voltage release is connected in parallel with the power supply.

當電路發生短路或嚴重過載時，過電流脫扣器的銜鐵吸合，使自由脫扣機構動作，主觸點斷開主電路。

When the circuit is short-circuit or seriously overloaded, the armature of the over-current release will pull in to make the free release mechanism act, and the main contact will disconnect the main circuit.

當電路過載時，熱脫扣器的熱元件發熱使雙金屬片上彎曲，推動自由脫扣機構動作，主觸點斷開主電路。

When the circuit is overloaded, the thermal element of the thermal release will generate heat to bend the bimetallic sheet, push the free release mechanism to act, and the main contact will disconnect the main circuit.

當電路欠電壓時，欠電壓脫扣器的銜鐵釋放，也使自由脫扣機構動作，主觸點斷開主電路。

When the circuit is under voltage, the armature of the under voltage release releases, which also makes the free release mechanism act, and the main contact disconnects the main circuit.

當按下分勵脫扣按鈕時，分勵脫扣器銜鐵吸合，使自由脫扣機構動作，主觸點斷開主電路。

When the shunt release button is pressed, the armature of the shunt release is closed to make the free release mechanism act, and the main contact breaks the main circuit.

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