Choosing a Proximity Switch
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Choosing an Electrical Switch
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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 |
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 Screw Terminals | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Screw On with Sealed Housing | ||||||||||||||
| A | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 0.75" | __ | 2.5" | 0.56" | 0.5" | Gray | __ | NEMA 1, IP62 | 0000000 | 00000 |
| A | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 1.25" | __ | 3.93" | 0.75" | 0.62" | Gray | __ | NEMA 1, IP62 | 0000000 | 00000 |
| A | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 1.25" | __ | 3.93" | 0.75" | 0.62" | White | __ | NEMA 1, IP62 | 0000000 | 00000 |
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 | 0000 |
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 |
Circuit Board Magnetically Actuated Switches
Mounted to your circuit board, these switches trigger when magnetic components get near, and reset as they move away. They’re often used to turn on electronics, such as starting up a laptop when you open it. To install, push the contacts through holes in a circuit board, then solder them in place.
Switches with a plastic housing withstand impact better than switches with a glass housing. The plastic also forms an airtight seal to block out contaminants. Use them in dusty or dirty environments where an optical switch might fail.
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. Voltage | Wire Dia. | Lg. | Wd. | Ht. | Protection Type | Environmental Rating | Specifications Met | Includes | Pkg. Qty. | Pkg. | |
| 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 200 V DC | 250V DC | 0.02" | 0.6" | 0.1" | 0.1" | Hermetically Sealed | NEC Class I Division 2 Groups A, B, C, D | UL Recognized Component, C-UL Recognized Component | Magnet | 20 | 0000000 | 000000 |
Circuit Board DC Magnetic-Object Proximity Switches
Send signals in response to changing magnetic fields to trigger processes or monitor position, speed, and current. These switches communicate with devices such as programmable logic controllers (PLCs) and microcontrollers. They’re also known as hall effect sensors. To install, push their contacts through holes in a circuit board, then solder them in place.
Maintained switches change their output signal based on the polarity of a magnetic field. They’re often used to monitor movement, such as tracking the speed and position of a shaft. These switches output a high-voltage signal when they detect a north pole, and a low-voltage signal for a south pole. When the magnetic field is removed, they maintain the same output signal.
Momentary switches change their output signal based on whether a magnetic field is present. They’re often used to trigger a process in response to changing magnetic fields, such as turning on a light when a door opens. When they detect a north or south pole, they output a low-voltage signal. When they don’t detect a magnetic field at all, they output a high-voltage signal.
For technical drawings and 3-D models, click on a part number.
| Switch Action | Switch Starting Position | Setpoint, G | Approximate Difference Between Setpoint and Reset Point, G | Switching Frequency, kHz | Switching Current @ Voltage | Max. Voltage | Wire Dia. | Lg., mm | Wd., mm | Ht., mm | Temp. Range, °F | Pkg. Qty. | Pkg. | |
Plastic Housing | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maintained | 1 Off (Normally Open) or 1 On (Normally Closed) | 90 | __ | 10 | 5 mA @ 24 V DC | 24V DC | 0.015" | 3 | 4 | 2 | -40° to 185° | 10 | 0000000 | 000000 |
| Momentary | 1 On (Normally Closed) | 395 | 40 | Not Rated | 0.008 mA @ 3 V DC | 5.5V DC | 0.015" | 3 | 4 | 2 | -40° to 255° | 10 | 0000000 | 00000 |