Choosing a Proximity Switch
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Choosing an Electrical Switch
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Heavy Duty Limit Switches
Rugged enough for mining operations, these limit switches require a high actuation force, like heavy rocks moving on a conveyor. They open and close a circuit as quickly as a snap-acting switch but have a larger actuator for larger objects. The roller on the end of the lever arm reduces friction to prevent wear and tear on the switch. Rated NEMA 4 and 13 as well as IP67, these switches are protected from dirt, oil spraying, and temporary submersion.
To determine if you need a right or left actuation direction, stand facing where you'll put the switch. If objects will be passing to the right, you'll need a right actuation direction. If they'll be passing to the left, you'll need a left actuation direction.
Housing | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Actuation Direction | No. of Circuits Controlled | Switch Starting Position | Switch Action | Industry Designation | Switching Current @ Voltage | Max. Voltage  | Actuation Force | Operating Temp. Range, °F | Actuator Ht. | For Max. Cable OD | Lg. | Ht. | Dp. | Each | |
Aluminum Housing with Screw Terminals | |||||||||||||||
| Left | 2 | 2 On (Normally Closed) | Springs Back (Momentary) | DPST-NC | 20 A @ 120 V AC, 5 A @ 120 V DC | 600V AC 600V DC | 150 in.-oz. | -10° to 185° | 5.7" | 1/2" | 2.3" | 5" | 3.4" | 0000000 | 0000000 |
| Right | 2 | 2 On (Normally Closed) | Springs Back (Momentary) | DPST-NC | 20 A @ 120 V AC, 5 A @ 120 V DC | 600V AC 600V DC | 150 in.-oz. | -10° to 185° | 5.7" | 1/2" | 2.3" | 5" | 2" | 0000000 | 000000 |
Frame-Mounted Safety Switches
Also known as interlock switches, these ensure the safety of personnel by automatically shutting off power to machinery when an access door opens. Mount the switch to the door frame and mount a key to the door so that the key is inserted into the switch when the door is closed. When the door opens, the key is removed from the switch and the machine shuts down. They’re often used with machine guards for large robots.
All switches require an actuator key, but not all include one—check whether you need to pick out a separate actuator key. For some switch styles, you can also select the mounting orientation of the key. Flexible keys pivot at least 15°, making them easier to align with switches during installation.
Style A-G switches have positive-force, normally closed contacts that will open a circuit when the switch is actuated even if a spring fails or the contacts stick.
IP67 rated switches protect against temporary submersion.
Housing | Conduit | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Style | No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Ht. | Wd. | Dp. | Trade Size | Thread Size | Thread Type | Key Included | Environmental Rating | Each | |
Screw Terminal Connection with Positive-Force Normally Closed Contacts | |||||||||||||||||
| E | 2 | 2 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-NC | 8 A @ 230 V AC, 5 A @ 24 V DC | 400V AC 24V DC | 4.2" | 2" | 1.6" | __ | M20 | Metric | No | IP67 | 00000000 | 000000 |
| F | 2 | 2 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-NC | 2 A @ 400 V AC | 400V AC | 4.4" | 1.6" | 1.6" | __ | M20 | Metric | No | IP67 | 000000000 | 00000 |
| F | 2 | 2 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-NC | 2 A @ 400 V AC | 400V AC | 4.4" | 1.6" | 1.6" | 1/2 | __ | BSPP | No | IP67 | 000000000 | 00000 |
| F | 2 | 2 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-NC | 2 A @ 400 V AC | 400V AC | 4.4" | 1.6" | 1.6" | 1/2 | __ | NPT | No | IP67 | 000000000 | 000000 |
Hinge-Actuated Safety Switches
Replace the hinges on access doors or machine guards with these switches to keep your team safe from active machinery. Also known as interlock switches, they automatically shut off power to your machinery when the door or guard opens. They can be mounted on flat frames or aluminum T-slotted framing. These switches have positive-force, normally-closed contacts that will open a circuit when the switch is actuated, even if a spring fails or the contacts stick. They’re rated IP65 for protection from washdowns.
Overall | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Rail Ht., mm | Mounting Hole Ctr.-to-Ctr. Wd., mm | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Wire Connection Type | Conduit Thread Size | Ht. | Wd. | Dp. | Each | |
2 Circuits Controlled—2 On (Normally Closed) | ||||||||||||
4° Actuation Angle—Aluminum Hinge | ||||||||||||
| 40 | 44 | Springs Back (Momentary) | 4 | DPST-NC | 2 A @ 230 V AC | Screw Terminals | M20 | 3.62" | 4.39" | 1.42" | 00000000 | 0000000 |
Hazardous Location Valve Position Switches
Support flow and temperature control in your system with these intrinsically safe switches, which sense when a valve is open or closed in volatile areas. Often used in chemical plants and oil and gas facilities, they are ATEX and IECEx internationally certified to protect against explosion where flammable gases and combustible dust are present.
Mount the switch to your valve actuator, and affix a corresponding activator (sold separately) onto your actuator’s shaft. As the valve opens and closes, the activator rotates until its targets align with the two inductive sensors on the switch. Once they’re aligned, your system will know that the valve is either open or closed—providing reliable feedback on your valve’s position. These switches have a 4-pole micro M12 plug to connect to NAMUR cables (sold separately), letting you quickly connect and disconnect the switch from your equipment. Connect them to programmable logic controllers (PLCs) to support automated processes. Switches meet various national and international safety standards, and they’re rated IP67 to protect against dust, washdowns, and temporary submersion.
Micro
M12 Plug
Switches with curved face minimize pinch points between the switch and activator, making them good for manually-controlled valves.
To view switch wiring diagrams, select a part number and click Product Detail.
| Switch Starting Position | Switching Frequency, kHz | Max. Sensing Distance, mm | Signal Output Type | Input Voltage | Current Output | Lg., mm | Circuit Protection | Temperature Range, °F | Environmental Rating | Each | |
With Flat Face | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
With 4-Pole Micro M12 Plug | |||||||||||
| 2 On (Normally Closed) | 3 | 3 | NAMUR | 8V DC-8.5V DC | 10mA | 36 | Reverse Polarity Short Circuit | -10° to 210° | IEC Zone 0 Groups IIC, IIB, IIA IEC Zone 2 Groups IIC, IIB, IIA IEC Zone 20 Groups IIIC, IIIB, IIIA IP67 | 0000000 | 0000000 |
With Curved Face | |||||||||||
With 4-Pole Micro M12 Plug | |||||||||||
| 2 On (Normally Closed) | 1.5 | 3 | NAMUR | 8V DC-8.5V DC | 10mA | 42 | Reverse Polarity Short Circuit | -10° to 210° | IEC Zone 0 Groups IIC, IIB, IIA IEC Zone 2 Groups IIC, IIB, IIA IEC Zone 20 Groups IIIC, IIIB, IIIA IP67 | 0000000 | 000000 |
The position of metal targets on your activator determines when your switch sends a signal to your PLC. To install, line up one of the activator's targets with one of the switch's sensors while your valve is closed. Choose an activator that prompts your desired signal.
Styles A and F prompt a signal from your sensor to your system when your valve is fully opened and closed.
Style B have a symmetrical design so you can position a switch on both sides of the activator to create redundant signals and support safety applications.
Style C prompt a signal from your sensor when your valve is not fully opened or closed—such as when your valve is in motion or stuck partially open.
Style D have customizable targets, prompting a signal when your valve reaches the position or range of motion you select.
| Style | For Maximum Shaft Dia., mm | For Minimum Shaft Dia., mm | For Shaft Lg., mm | Dia., mm | Ht., mm | Body Material | Temperature Range, °F | Mounting Fasteners Included | Each | |
For Switches with Flat Face | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A | 58 | __ | 20, 30 | 65 | 39 | Plastic | -10° to 155° | Yes | 0000000 | 000000 |
| A | 90 | __ | 20, 50 | 115 | 63 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
| B | 58 | __ | 20, 30 | 65 | 39 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
| C | 58 | __ | 20, 30 | 65 | 39 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
| D | 53 | __ | 20 | 65 | 40 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
For Switches with Curved Face | ||||||||||
| F | __ | 34 | 20, 30, 50 | 40 | 39 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
| F | 34 | __ | 20 | 40 | 32 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
| F | 34 | __ | 30 | 40 | 43 | Plastic | -10° to 155° | Yes | 0000000 | 00000 |
