Foot switches are switches that are foot actuated by a pedal or air bulb (bellows). Foot switches are available in many configurations, such as multi-pedal, snap action switch, slow action switch, potentiometer, variable speed control, explosion proof, waterproof and fully-guarded. Important aspects of foot switches to consider include switch specifications, electrical switch specifications, physical specifications, features, and environment.
Switch specifications to consider when searching for foot switches include pedals, switch or actuation method, and function. Foot switches can have one, two, or three pedals. Choices for switch or actuation method include snap action, slow action, air switch, and potentiometer. In a snap action switch the action speed of the switch contact is independent of the actuator speed. In a slow action switch for double throw contacts the moving contact interrupts one contact before establishing the other. An air switch uses a foot actuated air bulb for actuation to a remote switch. Some switches contain an integral potentiometer. Choices for switch function include maintained contact, momentary contact, single stage, two stage, three stage, mechanical interlock, and variable.
Electrical switch specifications to consider when searching for foot switches include pole and throw specifications, configuration, contact style, maximum current, maximum AC voltage, and maximum DC voltage. Pole and throw specification choices include single pole, single throw (SPST), single pole, double throw (SPDT), double pole, single throw (DPST), and double pole, double throw (DPDT). Switch configuration can be normally open or normally closed. The contact style can be single break, double break, shorting, or non-shorting. The maximum current is the maximum nominal, or nameplate current capacity of a device. The maximum AC and DC voltage capabilities are also important to consider.
Important physical specifications to consider when searching for foot switches include switch base material, actuator or pedal material, and terminal type. The switch base material can be thermoplastic or plastic, PVC, or metal. Choices for actuator or pedal material include thermoplastic or plastic, PVC or metal. The terminal type on foot switches can be wire leads or cords without plugs, wire leads or cords with plugs, solder terminals, screw terminals, and quick connects or blades. Common protection features found on foot switches include no guard, full guard, anti-trip mechanism, dustproof, explosion proof, and weather resistant or waterproof. Certifications granted include CE certification, CSA certification, and UL listing or registration. The operating temperature is an important environmental parameter to consider.
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