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 |
Ultra-Miniature Snap-Acting Switches
Trigger actions in devices as small as phones and drones. The smallest snap-acting switches we offer, these switches fit into the tiniest of spaces and help keep weight to a minimum. Because snap-acting switches open and close circuits faster than other switches—reducing the time that contacts are near one another—they prevent contacts from sticking. They also minimize the chance of arcing, so electricity won’t jump across contacts.
Plunger actuator switches send a signal when the actuator is pushed directly downward. They have a small footprint, reducing the risk of accidental switching.
For technical drawings and 3-D models, click on a part number.
Housing | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Circuits Controlled | Switch Starting Position | Switch Action | Industry Designation | Switching Current @ Voltage | Max. Voltage | Operating Temp. Range, °F | Actuator Ht. | No. of Terminals | Lg. | Ht. | Dp. | Environmental Rating | Pkg. Qty. | Pkg. | |
Plunger Actuator Style | |||||||||||||||
With Solder Lugs | |||||||||||||||
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Springs Back (Momentary) | DPST-1NO/1NC | 5 A @ 250 V AC | 250V AC | -40° to 185° | 0.06" | 4 | 0.7" | 0.37" | 0.2" | IP40 | 1 | 0000000 | 000000 |
With Solder Pin Terminals | |||||||||||||||
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Springs Back (Momentary) | DPST-1NO/1NC | 5 A @ 250 V AC | 250V AC | -40° to 185° | 0.07" | 4 | 0.7" | 0.37" | 0.2" | IP40 | 1 | 0000000 | 00000 |