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.
For technical drawings and 3-D models, click on a part number.
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 |
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.
For technical drawings and 3-D models, click on a part number.
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 |
