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About Pressure Switches
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Compare different types of pressure switches and learn how they work.
Pressure Switches for Water Pumps
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Pressure Switches | Pressure Switches with Manual On/Off Lever |
Activate or deactivate your electric water pump based on water pressure. These switches turn your pump off when pressure increases to the set pressure and on when pressure drops to the reset pressure. All are NEMA rated to stand up to some corrosion, but they shouldn’t be used outdoors. UL listed and CSA certified, switches meet American and Canadian safety standards.
Low-Pressure Cutoff—Switches with low-pressure cutoff turn your pump off if water pressure dips 10 psi lower than the reset pressure. This stops the system from pumping when there’s an issue in your line, such as a leak or break, to avoid flooding or other damage. These switches will also resume pump control with their previous setpoints when turned back on.
Pressure Switches with Manual On/Off Lever—Use switches with a manual on/off lever to turn off your system for maintenance or for long periods of time. When you turn them back on, they’ll resume pump control and remember their pressure setpoints.
Pressure Switches with Pressure Surge Protection—Switches with pressure surge protection won’t activate during brief periods of high pressure. They’re often used in systems that have frequent pressure spikes.
Max. Horsepower | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pressure Set Point Range, psi | Reset Point, psi | Approx. Difference Between Set Point and Reset Point, psi | Max. Continuous Pressure, psi | Accuracy | AC (Single Phase) | AC (Three Phase) | DC | Wire Connection | Enclosure Rating | Each | |||
Pressure Switches | |||||||||||||
1/4 NPT Female Pipe | |||||||||||||
| 1 to 12 | 3 to 7 | 4 | 12 | ±5% | 2 hp @ 120V AC 3 hp @ 240V AC | 5 hp @ 240V AC | 1/2 hp @ 32V DC 1/2 hp @ 230V DC | Screw Terminal | NEMA 1 | 41535K98 | 0000000 | ||
| 3 to 35 | 5 to 10 | 10 | 35 | ±5% | 2 hp @ 120V AC 3 hp @ 240V AC | 5 hp @ 240V AC | 1/2 hp @ 32V DC 1/2 hp @ 230V DC | Screw Terminal | NEMA 1 | 41535K96 | 000000 | ||
| 5 to 65 | 30 to 50 | 22 | 65 | ±5% | 1 1/2 hp @ 120V AC 2 hp @ 240V AC | 3 hp @ 240V AC | 1/4 hp @ 32V DC 1/4 hp @ 230V DC | Screw Terminal | NEMA 1 | 41535K93 | 000000 | ||
| 5 to 80 | 30 to 50 | 22 | 80 | ±5% | 2 hp @ 120V AC 3 hp @ 240V AC | 5 hp @ 240V AC | 1/2 hp @ 32V DC 1/2 hp @ 230V DC | Screw Terminal | NEMA 1 | 41535K94 | 000000 | ||
Pressure Switches with Manual On/Off Lever | |||||||||||||
1/4 NPSF Female Pipe | |||||||||||||
| 20 to 65 | 5 to 45 | 20 | 65 | ±3% | 1 1/2 hp @ 120V AC 2 hp @ 240V AC | 2 hp @ 120V AC 3 hp @ 240V AC | — | Screw Terminal | NEMA 1 | 41535K11 | 00000 | ||
| 25 to 80 | 5 to 60 | 20 | 80 | ±3% | 2 hp @ 120V AC 3 hp @ 240V AC | 3 hp @ 120V AC 5 hp @ 240V AC | 1/2 hp @ 120V DC 1/2 hp @ 240V DC | Screw Terminal | NEMA 1 | 41535K12 | 00000 | ||
Pressure Switches with Manual On/Off Lever and Low-Pressure Cutoff | |||||||||||||
1/4 NPSF Female Pipe | |||||||||||||
| 20 to 65 | 5 to 45 | 20 | 65 | ±3% | 1 1/2 hp @ 120V AC 2 hp @ 240V AC | 2 hp @ 120V AC 3 hp @ 240V AC | 1/4 hp @ 240V AC 1/4 hp @ 120V DC | Screw Terminal | NEMA 1 | 41535K14 | 00000 | ||
Pressure Switches with Pressure Surge Protection | |||||||||||||
1/4 NPSF Female Pipe | |||||||||||||
| 20 to 65 | 5 to 45 | 20 | 65 | ±3% | 1 1/2 hp @ 120V AC 2 hp @ 240V AC | 2 hp @ 120V AC 3 hp @ 240V AC | — | Screw Terminal | NEMA 1 | 41535K13 | 00000 | ||
Pressure Switches for Sump Pumps
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Since these switches activate on increasing pressure caused by rising water levels, they have no floats to catch on sump pit walls. Use them to replace an existing switch, or pair them with a plug-in activated pump to control when the pump activates.
Wire Lead Connection—Switch with wire leads can be connected to a three-pronged plug or wired directly to a power source.
