Low-Pressure Switches | McMaster-Carr

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86 Products

About Pressure Switches

The traditional pressure switch. These power equipment, activate controls or alarms, or kick-off other actions when they reach a set pressure. Larger than compact pressure switches, they're easier to wire. These switches 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).

NEMA 1 rated switches should only be used indoors. NEMA 4 and NEMA 4X rated switches can be used in dirty and wet areas exposed to washdowns and the weather. NEMA 4X also has increased protection against corrosion, similar to 304 stainless steel. IP65 rated switches can be lightly rinsed. IP66 switches withstand washdowns.

Styles H and L have internal and external threads, so you can attach these switches to a male or female pipe connection.

Styles A-C, E-J, and L meet at least one safety standard.

Switches with a cover protect against impact and keep dust off the switch.

Switches

Screw Terminals
Style	Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temp., °F	Connection Material	For Use With	Environmental Rating		Each
1/4 NPT Male Pipe Connection
A	3-30	0.95	50	230	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 30 V DC 30 mA @ 125 V DC	0° to 200°	Aluminum	Air, Hydraulic Fluid (Petroleum Based), Oil, Water	__	0000000	0000000
A	10-100	1.5	200	300	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 30 V DC 30 mA @ 125 V DC	0° to 200°	Aluminum	Air, Hydraulic Fluid (Petroleum Based), Oil, Water	__	0000000	000000
A	30-300	2.5	400	500	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 30 V DC 30 mA @ 125 V DC	0° to 200°	Aluminum	Air, Hydraulic Fluid (Petroleum Based), Oil, Water	__	0000000	000000
A	50-500	3.5	600	700	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 30 V DC 30 mA @ 125 V DC	0° to 200°	Aluminum	Air, Hydraulic Fluid (Petroleum Based), Oil, Water	__	0000000	000000
1/2 NPT Male Pipe Connection
B	0.6-14.2	0.65	15	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Brass	Air, Hydraulic Fluid, Nitrogen, Oil, Water	NEMA 1	00000000	000000
B	3.5-82	4	90	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Brass	Air, Hydraulic Fluid, Nitrogen, Oil, Water	NEMA 1	00000000	000000
B	29-472	16	500	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Aluminum	Air, Hydraulic Fluid, Nitrogen, Oil, Water	NEMA 1	00000000	000000

Switches with Cover

Screw Terminals
Style	Setpoint	Approximate Difference Between Setpoint and Reset Point	Max. Continuous Pressure	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temp., °F	Connection Material	For Use With	Environmental Rating		Each
1/4 NPT Female Pipe Connection
C	4.5-30 in. of H2O	2.5 in. of H2O	30 in. of H2O	20	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	00000000	0000000
1/4 NPT Male Pipe Connection
E	3-30 psi	0.85 psi	50 psi	230	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 30 V DC 30 mA @ 125 V DC	0° to 200°	Aluminum	Air, Hydraulic Fluid (Petroleum Based), Oil, Water	NEMA 1	0000000	000000
1/2 NPT Female Pipe Connection
F	1-20 psi	0.55 psi	500 psi	1,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 1 A @ 30 V DC 30 mA @ 125 V DC	-70° to 300°	316L Stainless Steel	Air, Hydraulic Fluid, Oil, Water	NEMA 4X	0000000	000000
1/2 NPT Male Pipe Connection
G	0.6-14.2 psi	0.65 psi	15 psi	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Brass	Air, Hydraulic Fluid, Nitrogen, Oil, Water	IP65; NEMA 4	00000000	000000
G	3.5-82 psi	4 psi	90 psi	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Brass	Air, Hydraulic Fluid, Nitrogen, Oil, Water	IP65; NEMA 4	00000000	000000
G	11-230 psi	10 psi	250 psi	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Brass	Air, Hydraulic Fluid, Nitrogen, Oil, Water	IP65; NEMA 4	0000000	000000
G	29-472 psi	16 psi	500 psi	1,000	±2%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-20° to 165°	Aluminum	Air, Hydraulic Fluid, Nitrogen, Oil, Water	IP65; NEMA 4	0000000	000000
1/4 NPT Female Pipe Connection and 1/2 NPT Male Pipe Connection
H	450-3,000 psi	220 psi	3,000 psi	12,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
Wire Leads
1/4 NPT Female Pipe Connection
J	4.5-30 psi	1 psi	30 psi	500	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
J	9-60 psi	3 psi	60 psi	500	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
J	15-100 psi	4.5 psi	100 psi	1,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
J	30-200 psi	12 psi	200 psi	1,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
J	60-400 psi	20 psi	400 psi	2,400	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
K	0.068-1.6 psi	0.04 psi	1.7 psi	3	±0.5%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-65° to 165°	304 Stainless Steel	Air, Hydraulic Fluid, Nitrogen, Oil, Water	NEMA 4	0000000	000000
K	0.18-2.8 psi	0.11 psi	3 psi	10	±0.5%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-65° to 165°	304 Stainless Steel	Air, Hydraulic Fluid, Nitrogen, Oil, Water	NEMA 4	0000000	000000
K	0.66-17 psi	0.19 psi	18 psi	60	±0.5%	10 A @ 125 V AC 10 A @ 250 V AC 3 A @ 480 V AC	-65° to 165°	304 Stainless Steel	Air, Hydraulic Fluid, Nitrogen, Oil, Water	NEMA 4	0000000	000000
1/4 NPT Female Pipe Connection and 1/2 NPT Male Pipe Connection
L	150-1,000 psi	98 psi	1,000 psi	12,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000
L	450-3,000 psi	220 psi	3,000 psi	12,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Nitrogen, Oil, Water	IP66; NEMA 4X	0000000	000000

Dual-Setpoint Pressure Switches

Trigger two different automated processes, each with their own set pressure. These switches could, for example, turn one pump on to empty a tank when the pressure gets too high and another to fill the tank when the pressure drops too low. Or use them to trigger an alarm before turning off a pump. These have two single pole, double throw (SPDT) switches and can switch each circuit from off to on (normally open) or on to off (normally closed).

NEMA 4X and IP66 rated, these switches seal out dust and water from washdowns and weather, and they resist corrosion. They are UL listed, CSA certified, and CE marked to meet American, Canadian, and European safety standards.

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

Screw Terminals
Setpoint	Approximate Diff. Between Setpoint and Reset Point	Max. Continuous Pressure	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temperature Range, °F	Connection Material	For Use With	Environmental Rating		Each
1/4 NPT Female Pipe Connection
4.5 in. of H2O-30 in. of H2O	4.5 in. of H2O	30 in. of H2O	20	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	00000000	0000000
1.4 psi-2.1 psi	1.5 psi	15 psi	500	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000
1.4 psi-5 psi	3 psi	30 psi	500	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000
3 psi-7 psi	5 psi	60 psi	500	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000
7 psi-12 psi	9.5 psi	100 psi	1,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000
10 psi-23 psi	16 psi	200 psi	1,000	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000
22 psi-42 psi	32 psi	400 psi	2,400	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000
22 psi-70 psi	46 psi	600 psi	2,400	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 500 mA @ 125 V DC 250 mA @ 250 V DC	0° to 150°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66; NEMA 4X	0000000	000000

Compact Pressure Switches

With a round body that’s at least one-third thinner than traditional pressure switches, these fit in tight, cramped spaces. They’re often built into pumps and hydraulic systems with limited space in order to turn equipment on and off, activate automated controls, or signal alarms when they reach a set pressure. These switches are single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). They also meet at least one American, Canadian, or European safety standard.

Switches with an external setpoint adjustment have an external ring, so you can set the pressure quickly by hand. NEMA 1 rated switches protect against corrosion. NEMA 6 and IP67 rated switches seal out dust and water from washdowns and temporary submersion.

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

Quick-Disconnect Terminals

1/8 NPT Male Pipe Connection
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating		Each
External Setpoint Adjustment
100-800	60	5,000	6,000	±5%	5 A @ 250 V AC 3 A @ 28 V DC	-65° to 255°	316 Stainless Steel	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	NEMA 1	0000000	0000000
500-3,000	135	3,000	4,000	±6%	5 A @ 250 V AC 3 A @ 28 V DC	-65° to 255°	316 Stainless Steel	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	NEMA 1	0000000	000000
600-5,000	290	5,000	6,000	±6%	5 A @ 250 V AC 3 A @ 28 V DC	-65° to 255°	316 Stainless Steel	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	NEMA 1	0000000	000000
1/4 NPT Male Pipe Connection
External Setpoint Adjustment
250-450	90	600	7,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000
430-1,450	220	1,700	7,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000
1,650-3,900	425	4,400	7,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000
4,000-6,700	600	7,500	12,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000

Wire Leads

1/8 NPT Male Pipe Connection
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating		Each
External Setpoint Adjustment
100-800	60	5,000	6,000	±5%	5 A @ 250 V AC 3 A @ 28 V DC	-65° to 255°	316 Stainless Steel	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	NEMA 1	0000000	0000000
500-3,000	135	3,000	4,000	±6%	5 A @ 250 V AC 3 A @ 28 V DC	-65° to 255°	316 Stainless Steel	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	NEMA 1	0000000	000000
600-5,000	290	5,000	6,000	±6%	5 A @ 250 V AC 3 A @ 28 V DC	-65° to 255°	316 Stainless Steel	Air, Argon, Cleaning Solutions, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	NEMA 1	0000000	000000
1/4 NPT Male Pipe Connection
External Setpoint Adjustment
250-450	90	600	7,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000
430-1,450	220	1,700	7,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000
1,650-3,900	425	4,400	7,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000
4,000-6,700	600	7,500	12,000	±2%	5 A @ 125 V AC 5 A @ 250 V AC	-40° to 165°	Brass	Air, Hydraulic Fluid, Oil, Water	NEMA 1	00000000	000000

DIN Type C

DIN

1/4 NPT Male Pipe Connection
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating		Each
External Setpoint Adjustment
6-30	3	800	1,000	±5%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	0000000
8-60	6	800	1,000	±5%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	000000
10-100	9	800	1,000	±5%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	000000
20-200	16	800	1,000	±5%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	000000
50-500	60	5,000	8,000	±2%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	000000
100-1,000	85	5,000	8,000	±2%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	000000
200-2,000	165	5,000	8,000	±2%	3 A @ 125 V AC 2 A @ 30 V DC	-40° to 212°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Natural Gas, Oil, Water	IP67; NEMA 6	00000000	000000

Adjustable-Reset Pressure Switches

Choose when these switches reset to control the pressure range between when they activate and deactivate, commonly referred to as deadband and differential. You can adjust their reset point anywhere along the setpoint range. When they reach the set pressure, these switches power equipment, signal controls, or trigger alarms. They’re single pole, double throw (SPDT) and can either turn one device from off to on (normally open) or on to off (normally closed). UL listed and CSA certified, all meet American and Canadian safety standards. Those that are CE marked meet European safety standards.

Switches with an on/off indicator tell you the status of your equipment, letting you monitor your equipment even when it’s out of sight.

All protect against some corrosion. NEMA 1 rated switches should only be used indoors.

Switches with On/Off Indicator

Switch with On/Off Indicator

Screw Terminals
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point	Max. Continuous Pressure, psi	Max. Short-Term Pressure, psi	Accuracy	Max. Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating	Specifications Met		Each
1/4 NPT Male Pipe Connection
1/8-15	Adjustable	15	15	±1%	10 A @ 120 V AC 10 A @ 240 V AC	35° to 180°	Brass	Air, Diesel Fuel, Hydraulic Fluid, Water	NEMA 1	UL Listed, CSA Certified	0000000	0000000
2-60	Adjustable	60	60	±1%	10 A @ 120 V AC 10 A @ 240 V AC	35° to 180°	Brass	Air, Diesel Fuel, Hydraulic Fluid, Water	NEMA 1	UL Listed, CSA Certified	0000000	000000

Differential Pressure Switches for Air

Tube Connection

Pipe Connection

Often used with ovens, dryers, and HVAC systems, these switches detect small differences in air pressure to indicate a filter is clogged or help you maintain a certain air pressure. When the differential pressure reaches your setpoint, these switches can turn equipment on and off, activate automated controls, or signal alarms. 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). All meet at least one safety standard.

When measuring pressure in ductwork, pair them with a static pressure probe.

NEMA 13 rated switches can be used in dirty, damp, and oily areas. Switches rated IP54 protect against dust and splashing water.

Screw Terminals
Setpoint, in. of H2O	Approximate Difference Between Setpoint and Reset Point, in. of H2O	Max. Input Pressure	Accuracy	Max. Switching Current	Process Temp. Range, ° F	Connection Material	For Use With	Environmental Rating		Each
1/4" Barbed Male Tube Connection
0.08-1.2	0.05	40 in. of H2O	±1%	1.5 A @ 120 V AC 400 mA @ 250 V AC	0° to 185°	Nylon Plastic	Air	IP54, NEMA 13	0000000	000000
0.12-1.6	0.08	40 in. of H2O	±1%	1.5 A @ 120 V AC 400 mA @ 250 V AC	0° to 185°	Nylon Plastic	Air	IP54, NEMA 13	0000000	00000
0.2-2	0.09	40 in. of H2O	±1%	1.5 A @ 120 V AC 400 mA @ 250 V AC	0° to 185°	Nylon Plastic	Air	IP54, NEMA 13	0000000	00000
0.8-4	0.45	40 in. of H2O	±1%	1.5 A @ 120 V AC 400 mA @ 250 V AC	0° to 185°	Nylon Plastic	Air	IP54, NEMA 13	0000000	00000
2-10	0.7	40 in. of H2O	±1%	1.5 A @ 120 V AC 400 mA @ 250 V AC	0° to 185°	Nylon Plastic	Air	IP54, NEMA 13	0000000	00000
4-20	1.2	40 in. of H2O	±1%	1.5 A @ 120 V AC 400 mA @ 250 V AC	0° to 185°	Nylon Plastic	Air	IP54, NEMA 13	0000000	00000
1/8 NPT Female Pipe Connection
0.07-0.15	0.04	45 in. of H2O	±3%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-30° to 180°	Aluminum	Air	__	00000000	00000
0.15-0.55	0.1	45 in. of H2O	±3%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-30° to 180°	Aluminum	Air	__	00000000	00000
0.4-1.6	0.16	45 in. of H2O	±3%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-30° to 180°	Aluminum	Air	__	00000000	00000
1.4-5.5	0.3	45 in. of H2O	±3%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-30° to 180°	Aluminum	Air	__	00000000	00000
3-11.75	0.4	45 in. of H2O	±3%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-30° to 180°	Aluminum	Air	__	00000000	00000
4-20	0.5	45 in. of H2O	±3%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-30° to 180°	Aluminum	Air	__	00000000	00000
5-44	0.83	10 psi	±2%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-20° to 180°	Steel	Air	__	00000000	000000
9-85	2.15	10 psi	±2%	15 A @ 120 V AC 15 A @ 240 V AC 15 A @ 480 V AC	-20° to 180°	Steel	Air	__	00000000	000000

Hazardous Location Differential Pressure Switches for Air

With an explosionproof 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.

Screw Terminals
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
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

Pressure and Vacuum Switches

Because these switches work with both positive and negative (vacuum) pressures, you can use them in applications that span both. For example, these switches can turn on a light when they reach the setpoint to indicate which pressure is flowing. They’re also often used to trigger automated controls and activate alarms. These switches are single pole, double throw (SPDT) and can either turn one circuit from off to on (normally open) or from on to off (normally closed).

NEMA 4X and IP66 rated, they’re dust tight and protected from washdowns and corrosion. All are UL and C-UL listed, CSA and CSA-US certified, and CE marked, so they meet U.S., Canadian, and European safety standards.

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

Setpoint
Pressure, psi	Vacuum, in. of Hg	Approximate Difference Between Setpoint and Reset Point, psi	Maximum Continuous Pressure, psi	Maximum Short-Term Pressure, psi	Accuracy	Maximum Switching Current	Process Temp. Range, °F	Connection Material	For Use With	Environmental Rating		Each
Screw Terminals
1/4 NPT Female Pipe Connection
0-15	30-0	1.5	15	250	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66, NEMA 4X	0000000	0000000
0-30	30-0	2.25	30	250	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66, NEMA 4X	0000000	000000
0-60	30-0	4	60	250	±1%	15 A @ 125 V AC 15 A @ 250 V AC 15 A @ 480 V AC 6 A @ 30 V DC 500 mA @ 125 V DC 250 mA @ 250 V DC	20° to 300°	316 Stainless Steel	Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water	IP66, NEMA 4X	0000000	000000

Air-Pressure-Actuated HVAC Switches

Often used to detect clogged air filters and iced air conditioner coils, these switches sense small changes in pressure between two points in your duct.

Diaphragm Sensor
Setpoint, in. of H2O	Accuracy, in. of H2O	Temperature Range, °F	Current	Electrical Connection Type	Switch Type	Max. Pressure, psi	Low Pressure Side Connection	High Pressure Side Inside Connection	High Pressure Side Outside Connection		Each
0.05-5	0.025	-40° to 165°	2.9 A @ 240 V AC 5.8 A @ 120 V AC	Hardwire	SPDT	1	1/8 NPT Female	1/8 NPT Female	1/2 NPSM	000000	0000000
0.05-5	0.04	-40° to 165°	4.9 A @ 240 V AC 9.8 A @ 120 V AC	Hardwire	SPDT	1	1/8 NPT Female	1/8 NPT Female	1/2 NPSM	000000	000000