The change-over switch is also called the combination switch, and its operation mode is to rotate the plane from left to right. It has many advantages, such as small size, multiple contacts, multiple positions, and convenient operation. In terms of type, it is divided into unipolar, bipolar and tripolar.
To explore the principle of the transfer switch, we must first understand its contact system. It is composed of several static contact holders embedded in an insulating shell and moving contacts in a movable support. Among them, the movable contact is a double-breakpoint butt-connected contact bridge, and the control circuit is turned on or off by rotating the shaft of the handle.
The transfer switch can be composed of switches with different connections according to the requirements of the circuit to adapt to various requirements. In various control and measurement systems, the circuit can be easily converted if a transfer switch is used. Replacing the knife switch with a changeover switch can simplify the control loop or the measurement loop to the greatest extent, avoid large errors, and reduce the amount of components.