压力差控制与铜合金或不锈钢波纹管,X40的后缀表示掷4电路触点块。 无后缀表示单刀双掷2电路触点块,最大压力开关600VAC 5AMP .工作原理是：当被测压力超过额定值时，弹性元件的自由端产生位移，直接或经过比较后推动开关元件，改变开.

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