About Pressure Switches
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Choosing an Electrical Switch
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Hazardous Location Enclosed Push-Button Switches
Use these switches where ignitable gas and dust may be present. They're rated for use in hazardous locations.
For technical drawings and 3-D models, click on a part number.
Mounting | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Message (Actuator Color) | No. of Circuits Controlled per Button | Switch Starting Position | Switch Action | No. of Terminals per Button | Industry Designation | Switching Current @ Voltage | Max. Voltage  | Conduit Trade Size | Fasteners Included | No. of Holes | Hole Dia. | Each | |
With Screw Terminals | |||||||||||||
1 Mushroom Button | |||||||||||||
| Stop (Red) | 1 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-1NO/1NC | 10 A @ 120 V AC | 600V AC | 3/4 | No | 2 | 3/16" | 0000000 | 0000000 |
1 Flush Button | |||||||||||||
| Start (Black) | 1 | 1 Off (Normally Open) and 1 On (Normally Closed) | Springs Back (Momentary) | 4 | DPST-1NO/1NC | 10 A @ 120 V AC | 600V AC | 3/4 | No | 2 | 5/16" | 0000000 | 000000 |
1 Flush Button and 1 Projecting Button | |||||||||||||
| Start (Green), Stop (Red) | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Springs Back (Momentary) | 2 | DPST-1NO/1NC | 10 A @ 120 V AC | 600V AC | 3/4 | No | 2 | 9/32" | 0000000 | 000000 |
Vibration-Resistant 22 mm Panel-Mount Lever Switches
Prevent accidental actuation from bumps—these switches require you to grip and twist the lever to turn the switch. The contact block and actuator are all one piece, so they won’t separate in high-vibration applications. Install them in a standard panel cutout.
For technical drawings and 3-D models, click on a part number.
| Lever Lg. | No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Dia. | Dp. Behind Panel | Environmental Rating | Specifications Met | Each | |
2 Position with Screw Terminals | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/8" | 1 | 1 Off (Normally Open) | Stays Switched (Maintained) | 2 | SPST-NO | 0.6 A @ 120 V AC, 0.22 A @ 125 V DC | 240V AC 250V DC | 1 1/8" | 1 11/16" | NEMA 3, NEMA 12, IP65 | UL Listed, UL 508, CSA Certified, CCC Marked, CE Marked | 0000000 | 000000 |
| 1 1/8" | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-1NO/1NC | 0.6 A @ 120 V AC, 0.22 A @ 125 V DC | 240V AC 250V DC | 1 1/8" | 1 11/16" | NEMA 3, NEMA 12, IP65 | UL Listed, UL 508, CSA Certified, CCC Marked, CE Marked | 0000000 | 00000 |
3 Position with Screw Terminals | |||||||||||||
| 1 1/8" | 2 | 2 Off (Normally Open) | Stays Switched (Maintained) | 4 | DPST-NO | 0.6 A @ 120 V AC, 0.22 A @ 125 V DC | 240V AC 250V DC | 1 1/8" | 1 11/16" | NEMA 3, NEMA 12, IP65 | UL Listed, UL 508, CSA Certified, CCC Marked, CE Marked | 0000000 | 00000 |
Hazardous Location Enclosed Lever Switches
Use these switches where ignitable gas, dust, and fibers may be present. They're UL and C-UL listed for hazardous locations.
For technical drawings and 3-D models, click on a part number.
Mounting | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Actuator Color | Message (Switch Position) | No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Max. Voltage | Fasteners Included | No. of Holes | Hole Dia. | Each | |
3 Positions | |||||||||||||
With Screw Terminals | |||||||||||||
| Gray | Hand (Left), Off (Center), Auto (Right) | 2 | 1 Off (Normally Open) and 1 On (Normally Closed) | Stays Switched (Maintained) | 4 | DPST-1NO/1NC | 10 A @ 120 V AC | 600V AC | No | 2 | 5/16" | 0000000 | 0000000 |
Vibration-Resistant 22 mm Panel-Mount Key Switches
To prevent accidental actuation and limit access to sensitive equipment, these switches require a key to turn circuits on or off. The contact block and actuator are all one piece, so they won’t separate in high-vibration applications. Install them in a standard panel cutout. They’re keyed alike, so they will all open with the same key.
For technical drawings and 3-D models, click on a part number.
| No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Actuator Color | Switching Current @ Voltage | Max. Voltage | Dia. | Dp. Behind Panel | No. of Keys Included | Key Removal Position | Each | |
2 Position with Plastic Base | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
With Screw Terminals | |||||||||||||
| 1 | 1 Off (Normally Open) | Stays Switched (Maintained) | 2 | SPST-NO | Black | 0.6 A @ 120 V AC, 0.22 A @125 V DC | 240V AC 250V DC | 1 1/8" | 1 11/16" | 2 | Left | 0000000 | 000000 |
3 Position with Plastic Base | |||||||||||||
With Screw Terminals | |||||||||||||
| 2 | 2 Off (Normally Open) | Stays Switched (Maintained) | 4 | DPST-NO | Black | 0.6 A @ 120 V AC, 0.22 A @125 V DC | 240V AC 250V DC | 1 1/8" | 1 11/16" | 2 | Center | 0000000 | 00000 |
Enclosed Disconnect Switches
Cut power and keep it isolated to prevent equipment from starting up during inspection and maintenance. These switches are housed in a protective enclosure that resists denting, chipping, and cracking. Mount them to the wall when you run out of space in an electrical panel.
Switches with lockout secure in the off position with a padlock with a maximum shackle diameter of 5/16” (not included).
Add auxiliary contact blocks to send a signal or connect to another device, such as an alarm or indicating light.
Use additional power poles to control more than three circuits. Add neutral poles to open and close the neutral leg of a three phase system.
For technical drawings and 3-D models, click on a part number.
Switching | ||||||||
|---|---|---|---|---|---|---|---|---|
| Current, A | Voltage | Industry Designation | Electrical Phase (hp) | Ht. | Wd. | Environmental Rating | Each | |
Plastic Housing with Red Actuator | ||||||||
Stays Switched (Maintained) | ||||||||
3 Circuits | ||||||||
| 50 | 600V AC | 3PST | Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (7 1/2 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 0000000 |
| 63 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (10 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 80 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (20 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 100 | 600V AC | 3PST | Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (25 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
3 Circuits with Lockout | ||||||||
| 50 | 600V AC | 3PST | Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (7 1/2 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 63 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (10 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 80 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (20 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 100 | 600V AC | 3PST | Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (25 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
Plastic Housing with Gray Actuator | ||||||||
Stays Switched (Maintained) | ||||||||
3 Circuits | ||||||||
| 50 | 600V AC | 3PST | Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (7 1/2 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 63 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (10 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 80 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (20 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 100 | 600V AC | 3PST | Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (25 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
3 Circuits with Lockout | ||||||||
| 50 | 600V AC | 3PST | Single (1 1/2 hp @ 120 V AC) Single (3 hp @ 240 V AC) Three (7 1/2 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 63 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (5 hp @ 240 V AC) Three (10 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 80 | 600V AC | 3PST | Single (3 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (20 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| 100 | 600V AC | 3PST | Single (5 hp @ 120 V AC) Single (10 hp @ 240 V AC) Three (25 hp @ 240 V AC) | 8 11/16" | 5 7/8" | IP40, NEMA 3 | 00000000 | 000000 |
| "Main Switch" Label with Adhesive Back—13/16" Ht. × 3 3/16" Wd. | 0000000 | Each | 000000 |
| Switching Current, A | Each | |
| 10 | 0000000 | 000000 |
Hazardous Location Differential Pressure Switches for Air
With an explosion-proof enclosure that meets NEMA 7 and 9 standards for hazardous locations, these switches were tested and verified by UL and CSA for use where explosive gas or dust may be present. Often used with ovens, dryers, and HVAC systems, they can indicate a filter is clogged or help maintain a certain air pressure. These switches turn equipment on and off, activate automated controls, or signal alarms when the differential pressure reaches your setpoint. They are single pole, double throw (SPDT) and can be installed to turn one circuit from off to on (normally open) or from on to off (normally closed).
In addition to being UL listed and CSA certified, these switches are CE marked and FM approved, so they also meet European safety standards. They also are IP and NEMA rated for use outdoors and protect against dust and splashing water.
When measuring pressure in ductwork, pair them with a static pressure probe.
For technical drawings and 3-D models, click on a part number.
| Setpoint Range | Approximate Difference Between Setpoint and Reset Point | Max. Input Pressure | Accuracy | Max. Switching Current | Process Temp. Range, °F | Connection Material | For Use With | Environmental Rating | Each | |
Screw Terminals | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
1/8 NPT Female Pipe Connection | ||||||||||
| 0.07-0.15 in. of H2O | 0.13 in. of H2O | 45 in. of H2O | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 0000000 |
| 0.15-0.5 in. of H2O | 0.05 in. of H2O | 45 in. of H2O | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 0.4-1.6 in. of H2O | 0.18 in. of H2O | 45 in. of H2O | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 1.4-5.5 in. of H2O | 0.35 in. of H2O | 45 in. of H2O | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 3-11 in. of H2O | 0.45 in. of H2O | 45 in. of H2O | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 4-20 in. of H2O | 0.5 in. of H2O | 45 in. of H2O | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 0.5-2 psi | 0.3 psi | 35 psi | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | -40° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 1.5-8 psi | 1 psi | 35 psi | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 0° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 3-15 psi | 0.9 psi | 35 psi | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 0° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 4-25 psi | 0.7 psi | 35 psi | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 0° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |
| 15-50 psi | 1.25 psi | 70 psi | ±2% | 15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC | 0° to 140° | Aluminum | Air | IP54; NEC Class I Divisions 1, 2 Groups C, D; NEC Class II Division 1 Groups E, F ,G; NEMA 3; NEMA 7; NEMA 9 | 0000000 | 000000 |