What Are Receptacles and Mount Types

Limit switch receptacles serve as connectors for plug-in heads to establish electrical connections with wires. Understanding the various mount types aids in assembling the mounting body of a limit switch.

There are three main mount types:

1. Surface Mount Type - The most common and straightforward mount type available in both plug-in and non-plug-in style switches. Mounting the switch typically requires drilling two holes, and in hazardous location switches, four holes may be used. Wiring is facilitated through the conduit entrance at the bottom of the switch, and wires are connected to captive-type screw terminals in the receptacle.

a. Single Pole-Double Throw Switches - Usually comprising five screw terminals in the receptacle, four for connecting loads and one for grounding (though insulated housings may not require grounding). Wiring follows the diagram on the switch body for plug-in style switches or on the cover plate for non-plug-in style switches.

b. Double Pole-Double Throw Switches - These receptacles feature nine screw terminals, four more than the single pole receptacle.

NOTE: Epoxy-Filled Receptacle option ensures environmental sealing as it is prewired at the factory. On the other hand, Unitized Limit Switches prevent ingression between the switch body and receptacle as they are combined into one body, internally sealed with epoxy.

2. Manifold Mounting Type - This mount type enables wiring to be placed at the back of the limit switch. A gasket around the entrance prevents leakage into the switch if wires are run through a trough or wire way.

3. Side Mounting Type - Commonly associated with basic precision-style limit switches, where the switch body and receptacle are integrated into one piece. Wiring connections are made to either screw or solder terminals on the underside of the switch.