单控水位保护器 Single-control Water Level Protector
产品主要参数 Main parameters of products
额定电流（Rated current）：4A/250VAC
感应电流（Inductive current）：1A/250CAC
热电流（Thermal current）：5A/250VAC(开关未动作时，连通端子之间可承受的电流)
动作力（Maximum operating force）：0.25牛
最小释放力（Minimum release force）：0.05牛
触发点（Contact point）：14.7±0.4mm(从开关孔中间量起)
差动行程（Differential travel）：0.35mm
触点间隙（Contact clearance）：0.4mm
总高度（Total height）：89mm
推杆长（Length of handspike）：71mm
行程距离（Travel distance）：14mm
安装孔直线距离（Straight line distance between installation holes）：48mm
产品特性：
该产品主要是用于液位保护，当器皿中水位超过标准水位时，来切断电器电源，从而达到保护目的。
Characteristics of product:
This product is mainly used to protect the liquid level. It can switch off the power when the water level in the vessel is higher than the standard water level to reach the protection purpose.
电器强度：
带电部分与外壳间施加1500VAC电压，漏电流0.5mA历时1min，无击穿现象。
Strength of appliance
Apply 1500VAC voltage between the live part and shell with leaking current of 5mA for 1 minute, it has no breakdown.
绝缘电阻：
带电部分与非带电件之间的绝缘电阻≥ 100MΩ
Insulation resistance:
Insulation resistance between the live part and uncharged part ≥ 100MΩ
工作原理
单控的上面由一个电器开关，有1、2、3三个端子，1、3为常闭，1、2为常开。当器皿中的水位上升，导致浮子上浮，这是1、3断开，1、2闭合。当水位下降到标准水位时，1、3又为常闭，1、2为常开。电器又恢复正常。
Work principle
There is a switch and terminal 1, 2, 3 above the single controller. Of it, terminal 1 and 3 are often closed and terminal 1 and 2 are often opened. When the water level in the vessel rises, the floater will float upward, so terminal 1 and 3 are opened and terminal 1and 2 are closed. When the water level drops under the standard water level, terminal 1and 3 are closed and terminal 1 and 2 are opened and the electrical appliance can work normally.