Choosing an Electrical Switch
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Magnetically Actuated Switches
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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 | ||||||||||||||||
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Mounting Thread | 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. | Size | Each | Each | |||
Plastic Housing with Wire Leads | ||||||||||||||||
A | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.44" | 2 | __ | 1.1" | 0.33" | 0.21" | __ | 000000000 | 000000 | 000000000 | 000000 |
A | 1 | 1 On (Normally Closed) | SPST-NC | 1 A @ 24 V DC | 150V DC | 0.25" | 2 | __ | 1.1" | 0.33" | 0.21" | __ | 000000000 | 00000 | 000000000 | 00000 |
A | 1 | 1 On (Normally Closed) | SPST-NC | 1 A @ 24 V DC | 150V DC | 0.31" | 2 | __ | 1.1" | 0.33" | 0.21" | __ | 000000000 | 00000 | 000000000 | 00000 |
B | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.31" | 2 | __ | 1.125" | 0.75" | 0.25" | __ | 000000000 | 00000 | 000000000 | 00000 |
B | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 24 V DC | 400V DC | 0.25" | 2 | __ | 1.13" | 0.75" | 0.25" | __ | 00000000 | 00000 | 000000000 | 00000 |
B | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.2" | 3 | __ | 1.13" | 0.75" | 0.25" | __ | 00000000 | 00000 | 000000000 | 00000 |
B | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.44" | 3 | __ | 1.125" | 0.75" | 0.25" | __ | 000000000 | 00000 | 000000000 | 00000 |
C | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.25" | 2 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
C | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 24 V DC | 400V DC | 0.2" | 2 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 00000000 | 00000 | 000000000 | 00000 |
C | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.13" | 3 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 00000000 | 00000 | 000000000 | 00000 |
C | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.31" | 3 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
D | 1 | 1 Off (Normally Open) | SPST-NO | 0.4 A @ 24 V DC | 170V DC | 0.15" | 2 | 0.18" | 0.43" | __ | __ | __ | 00000000 | 00000 | 000000000 | 00000 |
D | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.31" | 2 | 0.25" | 1" | __ | __ | __ | 000000000 | 00000 | 000000000 | 00000 |
D | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.19" | 3 | 0.25" | 1" | __ | __ | __ | 000000000 | 00000 | 000000000 | 00000 |
F | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.56" | 2 | __ | 1.75" | 0.25" | 0.26" | __ | 000000000 | 00000 | 000000000 | 00000 |
F | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 24 V DC | 400V DC | 0.62" | 2 | __ | 1.75" | 0.25" | 0.26" | __ | 000000000 | 00000 | 000000000 | 00000 |
F | 1 | 1 Off (Normally Open) | SPST-NO | 3 A @ 24 V DC | 400V DC | 0.94" | 2 | __ | 2.625" | 0.34" | 0.34" | __ | 000000000 | 00000 | 000000000 | 00000 |
F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.62" | 3 | __ | 1.75" | 0.25" | 0.26" | __ | 000000000 | 00000 | 000000000 | 00000 |
F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 3 A @ 24 V DC | 120V DC | 0.81" | 3 | __ | 2.625" | 0.34" | 0.34" | __ | 000000000 | 000000 | 000000000 | 00000 |
G | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 24 V DC | 400V DC | 0.94" | 2 | __ | 2.53" | 0.625" | 0.75" | __ | 000000000 | 00000 | 000000000 | 00000 |
G | 1 | 1 Off (Normally Open) | SPST-NO | 3 A @ 24 V DC | 400V DC | 0.94" | 2 | __ | 2.53" | 0.625" | 0.75" | __ | 000000000 | 00000 | 000000000 | 00000 |
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 | 000000 | 00000000 | 00000 |
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 |
Stainless Steel Housing with Wire Leads | ||||||||||||||||
E | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.38" | 2 | 0.31" | 1.25" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 24 V DC, 2 A @ 120 V AC | 400V AC | 0.13" | 2 | 0.31" | 1.25" | __ | __ | 5/16"-24 | 00000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 0.8 A @ 24 V DC | 150V DC | 0.2" | 3 | 0.31" | 1.25" | __ | __ | 5/16"-24 | 00000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.44" | 3 | 0.31" | 1.25" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
Aluminum Housing with Wire Leads | ||||||||||||||||
E | 1 | 1 Off (Normally Open) | SPST-NO | 1 A @ 24 V DC | 200V DC | 0.56" | 2 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) | SPST-NO | 2 A @ 24 V DC | 400V DC | 0.31" | 2 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) | SPST-NO | 2.5 A @ 24 V DC | 400V DC | 0.19" | 2 | 0.31" | 1.25" | __ | __ | 5/16"-24 | 00000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) | SPST-NO | 3 A @ 24 V DC | 400V DC | 0.56" | 2 | 0.38" | 2.125" | __ | __ | 3/8"-27 | 000000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.31" | 3 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 1 A @ 24 V DC | 150V DC | 0.31" | 3 | 0.31" | 1.5" | __ | __ | 5/16"-24 | 000000000 | 00000 | 000000000 | 00000 |
E | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 3 A @ 24 V DC | 120V DC | 0.44" | 3 | 0.38" | 2.125" | __ | __ | 3/8"-27 | 000000000 | 000000 | 000000000 | 00000 |
Tamper-Resistant Magnetically Actuated Switches
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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.
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 | Coded Magnets | |||||||||||||
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No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage | Input Voltage | Max. Sensing Distance | Dia. | Lg. | Mounting Thread Size | Environmental Rating | Each | Each | ||
Plastic Housing with Wire Leads | ||||||||||||||
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 | 0000000 | 000000 |
Switches | Coded Magnets | Safety Relays | ||||||||||||||
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No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage | Input Voltage | Max. Sensing Distance | Lg. | Wd. | Ht. | Environmental Rating | Each | Each | Each | |||
Plastic Housing with Wire Leads | ||||||||||||||||
2 | 1 Off (Normally Open) and 1 On (Normally Closed) | DPST-1NO/1NC | 0.5 A @ 120 V AC/120 V DC | 120V DC 120V AC | 120V DC 120V AC | 0.2" | 3.5" | 1" | 0.5" | IP67 | 0000000 | 0000000 | 0000000 | 000000 | 0000000 | 0000000 |
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 | 000000 |
Magnetic Contact Alarm Switches
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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 | ||||||||||||||
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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 4X, NEMA 6, NEMA 12, IP67 | 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 |
A | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 0.25 A @ 30 V AC/30 V DC | 0.75" | __ | 2.5" | 0.56" | 0.5" | White | __ | __ | 0000000 | 00000 |
A | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | SPDT | 0.25 A @ 30 V AC/30 V DC | 1.25" | __ | 3.93" | 0.75" | 0.62" | White | __ | __ | 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 |
C | 1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 100 V AC/100 V DC | 6" | 1 1/2 | 6.12" | 0.5" | 1" | __ | __ | __ | 00000000 | 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 |
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.
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No. of Circuits Controlled | Switch Starting Position | Industry Designation | Switching Current @ Voltage | Max. Voltage | Wire Dia. | OD | Lg. | Specifications Met | Pkg. Qty. | Pkg. | |
1 | 1 Off (Normally Open) | SPST-NO | 0.5 A @ 200 V DC | 250V DC | 0.02" | 0.1" | 0.6" | UL Recognized Component, C-UL Recognized Component | 20 | 0000000 | 000000 |
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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 |