What Is a Transfer Switch?

A transfer switch is a low-voltage switch that switches multiple circuits. A plurality of moving contacts are welded on the shaft, and when the shaft rotates, the moving contacts are sequentially connected or disconnected with the static contacts, and the circuit is switched. Change the circuit from one set of connections to another set of connected appliances. There are two types: discrete and integrated ^[1] .

The transfer switch is also called a combination switch. Unlike the knife switch, it is a flat operation that rotates left and right. The transfer switch has the advantages of multiple contacts, multiple positions, small size, reliable performance, convenient operation, and flexible installation.

The contact system of the transfer switch is composed of several static contact seats embedded in an insulating housing and moving contacts in a movable support. Moving contact is double

The transfer switch can be used as a circuit control switch, a test equipment switch, a motor control switch and a master control switch, and a transfer switch for a welding machine. The transfer switch is generally used to convert electrical control lines and electrical measuring instruments in circuits of AC 50HZ, voltage to 380V and below, and DC voltage of 220V and below. For example, the commonly used LW5 / YH2 / 2 type transfer switch is often used to convert and measure three-phase voltage.

Transfer switch LW5-16 YH3 / 3 The letters and numbers indicate:

LW-"Universal" anti-pinyin of universal switch;

5--design serial number;

16--Conventional heating current;

Y--voltage;

H--the first letter of the pinyin of "converted";

3--three phase;

3--three sections.

The meaning of LW5-16 YH3 / 3 is a universal change-over switch for voltage-indicating phase-to-phase voltage conversion.