What Is a Pushbutton Switch?
There are two types of pushbutton switch: one for power and the other for operation. The power pushbutton switch is a button that directly inputs power into the motor. Once it is turned on, the power remains on even if the user removes their hand from the button. To turn off the power, press the off button. The operating pushbutton is used to operate the electromagnetic contactor or electromagnetic switch. Once the button is turned on, the power is turned off by removing your hand from the button.
Basically, this switchgear has a robust exterior to withstand both outdoor and indoor use. It is sturdier than a household switch box and is available in an exposed type for indoor use and a rainproof structure for outdoor use.
Uses of the Pushbutton Switches
Pushbutton switches switches are installed in various industrial machines, such as woodworking machines, machine tools, and food processing machines, to switch them on and off.
For operation, they are used as pushbutton switches for electromagnetic switches and electromagnetic contactors for hoists, cranes, pumps, heaters, etc.
Pushbutton switches for large currents and waterproof or dustproof types with the button part covered with a special resin are also available to meet the needs of special environmental applications, such as outdoors and in factories. There is also switchgear with an overload protection device and an adjustment knob.
Principle of the Pushbutton Switches
The pushbutton switch consists of a push button attached to an electromagnetic switch with a case and an electromagnetic contactor. Some types of pushbutton switch have the operating circuit wiring already connected, but if not, make sure to connect the wiring correctly. Check the contact configuration as it varies from product to product.
The direct-in starting method using an operating pushbutton switches are often used in the circuit to start an electric motor. Connect a thermal relay and an electric motor to the main contacts of the electromagnetic switch. The thermal relay is used to protect the equipment. Pushbutton switches are connected to the electromagnetic switch, and the switch starts the motor. Use within the range of the rated current and voltage specified by the product. Some products are equipped with an interlock to prevent opening and closing while the switch is turned on.
ABS resin is often used for the outer plastic case of the pushbutton switches; ABS resin is lightweight, has good insulation properties, and can be used outdoors. Some pushbutton switches are made of impact-resistant steel.