Choosing a Proximity Switch
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Choosing an Electrical Switch
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Magnetically Actuated Switches
These switches actuate when a magnet comes within sensing distance, and reset when the magnet moves away. They’re often used to detect when a door or window opens. Mount the switch in a stationary position, such as a door frame, and mount the magnet to a movable object, such as the door. They do not include a safety relay and cannot be used with safety-guard doors found on machinery.
NEMA 4X rated switches are protected from corrosion and washdowns. These switches are also rated IP67 for protection from temporary submersion.
For technical drawings and 3-D models, click on a part number.
Magnetically Actuated Switches | Replacement Magnets | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage  | Max. Sensing Distance | No. of Wire Leads | Dia. | Lg. | Wd. | Ht. | Each | Each | |||
Plastic Housing with Wire Leads—NEMA 4X, IP67 | |||||||||||||||
| A | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 30 V AC, 2 A @ 60 V DC | 250V AC/250V DC | 0.8" | 2 | __ | 3.16" | 0.79" | 0.59" | 00000000 | 0000000 | 00000000 | 000000 |
| B | 1 | 1 Off (Normally Open) | SPST-NO | 80 mA @ 120 V AC | 250V AC | 0.4" | 2 | __ | 1.13" | 0.71" | 0.25" | 00000000 | 000000 | 00000000 | 00000 |
| D | 1 | 1 Off (Normally Open) | SPST-NO | 80 mA @ 120 V AC | 250V AC | 0.1" | 2 | 0.24" | 1.12" | __ | __ | 00000000 | 000000 | 00000000 | 00000 |
Magnetic Contact Alarm Switches
Wire contacts to an alarm system to alert when doors or windows are opened. Mount the magnet to the door or window and mount the switch to the frame. The alarm will activate when the magnet is pulled away by the opening door or window.
SPDT switches connect to an alarm system and to another device, such as a motion detector.
| Style | No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Sensing Distance | Wire Lead Lg., ft. | Lg. | Wd. | Ht. | Color | Environment | Environmental Rating | Each | |
Plastic Housing with Wire Leads | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Adhesive Back with Sealed Housing | ||||||||||||||
| A | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 0.62" | 1 | 1.5" | 0.25" | 0.37" | White | Corrosive, Oily, Outdoor, Washdown, Submersible | NEMA 4X, NEMA 6, NEMA 12, IP67 | 0000000 | 00000 |
Aluminum Housing with Wire Leads | ||||||||||||||
Screw On with Flexible Stainless Steel Conduit and Sealed Housing | ||||||||||||||
| A | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 3" | 3 | 3" | 0.5" | 1" | __ | Corrosive, Washdown, Temporary Submersion | NEMA 4X, NEMA 6, NEMA 12, IP67 | 0000000 | 00000 |
| A | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 0.25 A @ 30 V AC/30 V DC | 3" | 3 | 3" | 0.5" | 1" | __ | Corrosive, Washdown, Temporary Submersion | NEMA 4X, NEMA 6, NEMA 12, IP67 | 0000000 | 00000 |
| B | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 3" | 3 | 3.5" | 1.5" | 1.5" | __ | Corrosive, Washdown, Temporary Submersion | NEMA 4X, NEMA 6, NEMA 12, IP67 | 0000000 | 00000 |
| B | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 0.25 A @ 30 V AC/30 V DC | 3" | 3 | 3.5" | 1.5" | 1.5" | __ | Corrosive, Washdown, Temporary Submersion | NEMA 4X, NEMA 6, NEMA 12, IP67 | 0000000 | 00000 |
| D | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 3" | 2 | 3.62" | 0.68" | 3" | __ | Corrosive, Oily, Outdoor, Washdown, Submersible | NEMA 4X, NEMA 6, NEMA 12, IP67 | 00000000 | 00000 |
Tamper-Resistant Magnetic Contact Alarm Switches
Prevent unauthorized use of doors or windows with a combination of coded magnets and contacts that wire to an alarm system. The coded magnets mean they can’t be bypassed with regular magnets. These switches actuate when the magnet comes within sensing distance of the switch and reset when the magnet moves away. Mount the magnet to your door or window and the switch to the frame. Connect the switch contacts to an alarm system, which will trigger when the magnet is pulled away as your door or window is opened.
Flush-mount switches are designed to mount against the door jam. They have a cord grip to reduce strain on your cord.
Surface-mount switches mount on the surface of your door. Those with a 1/2 conduit connection are ready to directly attach to your conduit.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Sensing Distance | No. of Terminals | Conduit Trade Size | Lg. | Wd. | Ht. | Features | Environmental Rating | Each | |
Painted Zinc Housing with Screw Terminals | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Screw On—Flush Mount | |||||||||||||
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 0.2 A @ 30 V DC | 0.26" | 7 | __ | 4.33" | 1.38" | 1.26" | Auxiliary NO (Normally Open) Alarm, Nickel-Plated Brass Cord Grip | IP67 | 0000000 | 000000000 |
Screw On—Surface Mount | |||||||||||||
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 0.2 A @ 30 V DC | 0.26" | 7 | __ | 2.96" | 1.38" | 1.34" | Auxiliary NO (Normally Open) Alarm | IP67 | 0000000 | 00000000 |
| 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 0.2 A @ 30 V DC | 0.26" | 7 | 1/2 | 2.96" | 1.38" | 1.34" | Auxiliary NO (Normally Open) Alarm | IP67 | 0000000 | 00000000 |
Tamper-Resistant Magnetically Actuated Switches
Prevent unauthorized use—these switches require coded magnets (sold separately) to actuate, and cannot be bypassed using ordinary magnets. They actuate when a magnet comes within sensing distance, and reset when the magnet moves away. Mount the switch in a stationary position, such as a door frame, and mount the magnet to a movable object, such as the door. They’re often used to detect when a door or window opens, and can be used with movable machine guards. All are rated IP67 for protection from temporary submersion.
Switches with an LED status indicator light up when they’re actuated, so you can see if they’re wired correctly with a quick glance.
Coded magnets include tamper-resistant one-way screws for mounting. To remove screws, see one-way bits and drivers.
Safety relays are required in safety applications with switches that control two or three circuits.
For technical drawings and 3-D models, click on a part number.
Switches | Cables with Socket | Coded Magnets | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage | Input Voltage | Max. Sensing Distance | Dia. | Lg. | Wd. | Ht. | Mounting Thread Size | Environmental Rating | Each | Each | Each | ||||
Plastic Housing with Wire Leads | |||||||||||||||||||
| A | 1 | 1 On (Normally Closed) | SPST-NC | 6.3 A @ 120 V AC | 250V AC | 24V DC | 0.2" | 1.2" | 3.1" | __ | __ | M30 | IP67 | 0000000 | 0000000 | 000000 | 00 | 0000000 | 000000 |
| A | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 0.28 A @ 120 V AC, 0.4 A @ 170 V DC | 120V AC 170V DC | 120V AC 170V DC | 0.2" | 1.2" | 1.3" | __ | __ | M30 | IP67 | 0000000 | 00000 | 000000 | 00 | 0000000 | 00000 |
| B | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 0.5 A @ 120 V AC/120 V DC | 120V AC 120V DC | 120V AC 120V DC | 0.2" | __ | 3.5" | 1" | 0.5" | __ | IP67 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
| B | 3 | 1 Off (Normally Open) and 2 On (Normally Closed) | 3PST-1NO/2NC | 10 mA @ 24 V DC | 24V DC | 24V DC | 0.2" | __ | 3.5" | 1" | 0.5" | __ | IP67 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
| B | 3 | 1 Off (Normally Open) and 2 On (Normally Closed) | 3PST-1NO/2NC | 0.4 A @ 100 V AC/100 V DC | 100V AC 100V DC | 100V AC 100V DC | 0.2" | __ | 3.5" | 1" | 0.5" | __ | IP67 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
Plastic Housing with Wire Leads and LED Status Indicator | |||||||||||||||||||
| B | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 10 mA @ 24 V DC | 24V DC | 24V DC | 0.2" | __ | 3.5" | 1" | 0.5" | __ | IP67 | 0000000 | 000000 | 000000 | 00 | 0000000 | 00000 |
Plastic Housing with 4-Pole Nano M8 Plug and LED Status Indicator | |||||||||||||||||||
| B | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 10 mA @ 24 V DC | 24V DC | 24V DC | 0.2" | __ | 3.5" | 1" | 0.5" | __ | IP67 | 0000000 | 000000 | 0000000 | 000000 | 0000000 | 00000 |
| B | 3 | 1 Off (Normally Open) and 2 On (Normally Closed) | 3PST-1NO/2NC | 10 mA @ 24 V DC | 24V DC | 24V DC | 0.2" | __ | 3.5" | 1" | 0.5" | __ | IP67 | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 |
DC Magnetic-Object Proximity Switches
These switches detect magnetic objects—or objects with a magnet attached—through non-magnetic walls. They’re often used to count magnetic items on a conveyor belt that are too far for other proximity switches to detect and in food plants to track cleaners through stainless steel pipe. Producing a PNP signal output, these switches are commonly used with programmable logic controllers (PLCs). Resistant to dust, heat, and vibration, switches will stand up to harsh environments. Magnets are sold separately.
Maximum sensing distance in the table below represents switches used with the magnet shown. Sensing distance will vary depending on the magnetic strength of the object your switch is detecting.
For technical drawings and 3-D models, click on a part number.
Switches | Magnets | Cables with Socket | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Switch Starting Position | Dia., mm | Max. Sensing Distance, mm | Magnetic Sensitivity | Signal Output Type | Switching Frequency, kHz | Input Voltage | Current Output | Lg., mm | Cable Lead Lg., ft. | Temp. Range, °F | Each | Each | Each | |||
Nickel-Plated Brass Housing with Plastic Face (IP67) | ||||||||||||||||
Flush with 3-Pole Nano M8 Plug | ||||||||||||||||
| 1 Off (Normally Open) | 8 | 55 | 10 G | PNP | 1 | 10V DC-30V DC | 200mA | 46 | __ | -10° to 165° | 0000000 | 0000000 | 0000000 | 000000 | 0000000 | 000000 |
| 1 On (Normally Closed) | 8 | 55 | 10 G | PNP | 1 | 10V DC-30V DC | 200mA | 46 | __ | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 |
Flush with 4-Pole Micro M12 Plug | ||||||||||||||||
| 1 Off (Normally Open) | 12 | 55 | 10 G | PNP | 1 | 10V DC-30V DC | 200mA | 46 | __ | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 |
| 1 Off (Normally Open) | 12 | 81 | 6 G | PNP | 1 | 10V DC-30V DC | 200mA | 63 | __ | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 |
| 1 Off (Normally Open) | 18 | 105 | 4 G | PNP | 5 | 10V DC-30V DC | 200mA | 60 | __ | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 |
| 1 On (Normally Closed) | 18 | 69 | 7 G | PNP | 5 | 10V DC-30V DC | 200mA | 50 | __ | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 0000000 | 00000 |
Flush with Wire Leads | ||||||||||||||||
| 1 Off (Normally Open) | 8 | 55 | 10 G | PNP | 1 | 10V DC-30V DC | 200mA | 48 | 6 1/2 | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 000000 | 00 |
| 1 Off (Normally Open) | 12 | 81 | 6 G | PNP | 1 | 10V DC-30V DC | 200mA | 50 | 6 1/2 | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 000000 | 00 |
| 1 Off (Normally Open) | 18 | 105 | 4 G | PNP | 5 | 10V DC-30V DC | 200mA | 58 | 6 1/2 | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 000000 | 00 |
| 1 On (Normally Closed) | 8 | 55 | 10 G | PNP | 1 | 10V DC-30V DC | 200mA | 48 | 10 | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 000000 | 00 |
| 1 On (Normally Closed) | 12 | 55 | 10 G | PNP | 1 | 10V DC-30V DC | 200mA | 48 | 6 1/2 | -10° to 165° | 0000000 | 000000 | 0000000 | 00000 | 000000 | 00 |