	For Use With For Use With

Water

Gasoline

	Maximum Setpoint Maximum Setpoint

1.7 psi

	Switching Voltage Switching Voltage

120V AC

240V AC

480V AC

	Maximum Pressure Maximum Pressure

	Switch Starting Position Switch Starting Position

1 Off (Normally Open)

1 On (Normally Closed)

	Operates On Operates On

Pressure

Differential Pressure

	Pipe Size Pipe Size

1/8

1/4

1/2

	Scale Scale

psi

in. of H2O

	Minimum Setpoint Minimum Setpoint

	Connection Material Connection Material

Aluminum

Brass

Stainless Steel

	Wire Connection Type Wire Connection Type


Screw Terminals	Wire Leads

	Environment Environment

	Height Height

	Maximum Process Temperature Maximum Process Temperature

	Gender Gender

Female

Male

	Switching Current Switching Current

10A

15A

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Width Width

	Minimum Environment Temperature Minimum Environment Temperature

	Minimum Process Temperature Minimum Process Temperature

	Maximum Environment Temperature Maximum Environment Temperature

	Gasket Material Gasket Material

Rubber

Stainless Steel

Brass

	Housing Material Housing Material

Steel

Aluminum

Plastic

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20 Products

About Pressure Switches

For Use With: Air
Connection Material: Aluminum
Connection: NPT Female
Switching Current: 15A
Switching Voltage: 120V AC/240V AC/480V AC

Often used with ovens, dryers, and HVAC systems, these switches detect small differences in pressure. When the differential pressure exceeds your setpoint, the switch is activated. Use them to automate controls or activate an alarm in your process. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC).

					Temperature Range, °F		Conduit
Setpoint, in. of H2O	Approximate Difference Between Setpoint and Reset Point, in. of H2O	Max. Pressure, in. of H2O	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection Gender	Specifications Met		Each
Zinc-Plated Steel Housing
0.07-0.15	0.04	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	000000
0.15-0.55	0.1	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
0.4-1.6	0.16	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
1.4-5 1/2	0.3	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
3-11 3/4	0.4	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000
4-20	0.5	45	± 3%	1/8	-30° to 180°	-30° to 180°	7/8	Female	CE Marked, CSA Certified, FM Approved, UL Recognized Component	00000000	00000

Washdown Low-Pressure Switches

These switches are rated NEMA 4 or 4X for protection from dirt and washdowns. Sensitive to low pressures, they electrically activate automated controls or alarms when a set pressure is reached. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC).

Style D has two setpoints, so it can control two independent circuits.

For Washdown Environments (NEMA 4)

For Use With: Air, Diesel Fuel, Hydraulic Fluid, Water
Connection Material:
Style A: Brass
Style B: 304 Stainless Steel
Connection:
Style A: 1/2 NPT Male
Style B: 1/4 NPT Female
Switching Current: 10A
Switching Voltage: 120V AC/240V AC

					Temp. Range, °F		Conduit
Style	Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Pressure, psi	Accuracy	Environment	Process	For Trade Size	Connection	Industry Designation	Environmental Rating	Specifications Met		Each
A	1/2-15	0.65	15	±2%	-20° to 165°	-20° to 165°	1/2	NPT Female	SPDT	IP65; NEMA 4	CSA Certified, UL Listed	00000000	0000000
A	3-90	4	90	±2%	-20° to 165°	-20° to 165°	1/2	NPT Female	SPDT	IP65; NEMA 4	CSA Certified, UL Listed	00000000	000000
B	0.018-1.7	0.04	3	±0.5%	-65° to 165°	-65° to 165°	1/2	NPT Female	SPDT	NEMA 4	__	0000000	000000
B	0.03-3	0.11	10	±0.5%	-65° to 165°	-65° to 165°	1/2	NPT Female	SPDT	NEMA 4	__	0000000	000000
B	0.4-18	0.19	60	±0.5%	-65° to 165°	-65° to 165°	1/2	NPT Female	SPDT	NEMA 4	__	0000000	000000

For Washdown and Corrosive Environments (NEMA 4X)

For Use With: Air, Diesel Fuel, Gasoline, Hydraulic Fluid, Water
Connection Material: 316 Stainless Steel
Connection: 1/4 NPT Female
Switching Current: 15A
Switching Voltage: 120V AC/240V AC/480V AC

					Temp. Range, °F		Conduit
Style	Setpoint, in. of H2O	Approximate Difference Between Setpoint and Reset Point, in. of H2O	Max. Pressure, psi	Accuracy	Environment	Process	For Trade Size	Connection	Industry Designation	Environmental Rating	Specifications Met		Each
C	4 1/2-30	2.5	20	±1%	-20° to 150°	20° to 300°	3/4	NPT Female	SPDT	IEC Zone 1 Groups IIC, IIB, IIA; IEC Zone 21 Groups IIIC, IIIB, IIIA; IP66; NEC Class I Divisions 1, 2 Groups B, C, D; NEC Class II Divisions 1, 2 Groups E, F, G; NEMA 4X	ATEX II 2GD Ex d IIC T6 Gb Ex tb IIIC T85°C Db, C-UL Listed, CE Marked, CSA Certified, CSA-US Certified, FM Approved, UL Listed	00000000	0000000
D	4 1/2-30	4.5	20	±1%	-20° to 150°	20° to 300°	3/4	NPT Female	SPDT	IP66; NEMA 4X	CE Marked, CSA Certified, CSA-US Certified, FM Approved, UL Listed	00000000	000000

Low-Pressure Switches

For Use With:
Style A: Air, Diesel Fuel, Hydraulic Fluid, Water
Style B: Air, Hydraulic Fluid (Petroleum Based)
Connection Material: See table
Connection: NPT Male
Switching Current:
Style A: 10A
Style B: 15A
Switching Voltage:
Style A: 120V AC/240V AC
Style B: 120V AC/240V AC/480V AC

Sensitive to low pressures, these switches electrically activate automated controls or alarms when a set pressure is reached. They are often used in heating and ventilation systems. Switches are single pole, double throw (SPDT), so they switch one circuit on or off. They can be wired normally open (NO) or normally closed (NC). Switches are rated NEMA 1 for indoor use.

Switches with polycarbonate housing absorb vibration to avoid false switch activation caused by high-vibration applications.

						Temperature Range, °F		Conduit
	Setpoint, psi	Approximate Difference Between Setpoint and Reset Point, psi	Max. Pressure, psi	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection Gender	Specifications Met		Each
Brass Connection
A	1/2-15	0.65	15	±2%	1/2	-20° to 165°	-20° to 165°	__	__	UL Recognized Component, CSA Certified	00000000	0000000
A	3-90	4	90	±2%	1/2	-20° to 165°	-20° to 165°	__	__	UL Recognized Component, CSA Certified	00000000	000000
Aluminum Connection—Polycarbonate Plastic Housing
B	3-30	0.85	50	±1%	1/4	0° to 160°	0° to 200°	7/8	Female	UL Listed, CE Marked	0000000	000000

Low-Pressure Switches with On/Off Indicator

For Use With: Air, Diesel Fuel, Hydraulic Fluid, Water
Connection Material: Brass
Connection: NPT Male
Switching Current: 10A
Switching Voltage: 120V AC/240V AC

A clear cover allows you to see if the switch is on or off. Switches electrically activate automated controls or alarms when a set pressure is reached. They are single pole, double throw (SPDT), so they switch one circuit on or off. The difference between setpoint and reset point is adjustable so you can set it anywhere within the setpoint range. Switches can be wired normally open (NO) or normally closed (NC). They are rated NEMA 1 for indoor use.

					Temperature Range, °F		Conduit
Setpoint, psi	Approximate Difference Between Setpoint and Reset Point	Max. Pressure, psi	Accuracy	Pipe Size	Environment	Process	For Trade Size	Connection Gender	Environmental Rating	Specifications Met		Each
Steel Housing
1/8-15	Adjustable	15	±1%	1/4	35° to 180°	35° to 180°	1/2	Female	NEMA 1	CSA Certified, UL Listed	0000000	0000000
2-60	Adjustable	60	±1%	1/4	35° to 180°	35° to 180°	1/2	Female	NEMA 1	CSA Certified, UL Listed	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

20 Products

About Pressure Switches

Low Differential Pressure Switches

Washdown Low-Pressure Switches

Low-Pressure Switches

Low-Pressure Switches with On/Off Indicator

Air-Pressure-Actuated HVAC Switches