Choosing an Electrical Switch
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Manual-Reset Safety Limit Switches
Prevent equipment from automatically restarting—these switches must be manually reset each time they're actuated. Pull the knob to reset. Positive-force contacts open the circuit when actuated, even if a spring fails or the contacts stick. These switches send a signal to your circuit when an object hits the actuator—for instance, a box on a conveyor runs into the switch, stopping the conveyor. They open and close circuits as fast as snap-acting switches, but they have a bigger actuator for large objects.
Rated IP67, these switches seal out water if they’re washed down or briefly submersed.
Styles B and C have a roller lever actuator that allows parts to glide across the actuation surface with minimal friction. Style C have an actuator that allows you to adjust its height, making it easier to align the switch with the target during installation.
For technical drawings and 3-D models, click on a part number.
Housing | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Style | No. of Circuits Controlled | Switch Starting Position | Switch Action | Industry Designation | Switching Current @ Voltage | Max. Voltage  | Operating Temp. Range, °F | Actuator Ht. | Wire Connection Type | No. of Terminals | Lg. | Ht. | Dp. | Housing Material | Conduit Thread Size | Each | |
Plunger Actuator Style | |||||||||||||||||
| A | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | DPST-1NO/1NC | 10 A @ 240 V AC, 2.5 A @ 125 V DC | 250V DC 300V AC | -22° to 158° | 1" | Screw Terminals | 4 | 1.2" | 3.4" | 1.2" | Plastic | M20 | 0000000 | 000000 |
Roller Lever Actuator Style | |||||||||||||||||
| B | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | DPST-1NO/1NC | 10 A @ 240 V AC, 2.5 A @ 125 V DC | 250V DC 300V AC | -22° to 158° | 2.4" | Screw Terminals | 4 | 1.2" | 3.4" | 1.2" | Plastic | M20 | 0000000 | 00000 |
| C | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | DPST-1NO/1NC | 10 A @ 240 V AC, 2.5 A @ 125 V DC | 250V DC 300V AC | -22° to 158° | 2.1"-3.9" | Screw Terminals | 4 | 1.2" | 3.4" | 1.2" | Plastic | M20 | 0000000 | 00000 |
Air-Actuated Hand Switches
Keep live electrical circuits away from work areas—these switches use air pressure to turn circuits on or off.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Lg. | Wd. | Ht. | Quick-Disconnect Tab Wd. | Includes | Each | |
| 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 20 A @ 125 V AC/250 V AC | 2 1/8" | 1 3/4" | 1 1/4" | 0.187" | 10 ft. Tubing | 0000000 | 000000 |
Air-Actuated Foot Switches
Press these switches with your foot for convenient, hands-free operation. They use air pressure to turn circuits on or off, keeping live electrical circuits away from work areas. Use the three-prong outlet to plug a device directly into the switch.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Dia. | Lg. | Wd. | Ht. | Guard Material | Includes | Each | |
With Three-Prong Outlet | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 Off (Normally Open) | Stays Switched (Maintained) | 2 | SPST-NO | 15 A @ 120 V AC | 3 3/4" | __ | __ | 1 1/2" | __ | 10 ft. Tubing | 0000000 | 000000 |
With Three-Prong Outlet and Guard | |||||||||||||
| 1 | 1 Off (Normally Open) | Stays Switched (Maintained) | 2 | SPST-NO | 15 A @ 120 V AC | __ | 6" | 6 1/2" | 4 11/16" | Plastic | 10 ft. Tubing | 0000000 | 00000 |