Pressure switch

Port Gender

Female (250)

Male (89)

Male/Female (23)

Female/Male (1)

Pressure Reading Type

Absolute, Gauge (134)

Differential (98)

Relative (80)

Gauge (34)

Relative, Vaccum (5)

Absolute (4)

Number of Ports

3 (188)

5 (62)

2 (56)

4 (18)

1 (6)

28 (1)

54 (1)

Digital Display

Yes (285)

No (40)

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RS PRO Pressure Switch -1 bar to 15 bar

RS Stock No. 235-4727

Brand RS Pro

Category: Vacuum Switches
Connection: G1/8
Minimum Operating Pressure: -1bar

AED 730.16

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RS PRO Pressure Switch -1 bar to 3 bar

RS Stock No. 235-4728

Brand RS Pro

Category: Vacuum Switches
Maximum Operating Pressure: 3 bar
Pressure Type: Positive Pressure

AED 1.634.41

in stock now

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RS PRO Pressure Switch NC 1 bar to 10 bar

RS Stock No. 363-5968

Brand RS Pro

Connection Thread Standard: G
Maximum Operating Temperature: +80°C
Pressure Type: Positive Pressure

AED 376.54

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RS PRO Pressure Switch 0.5 bar to 8 bar

RS Stock No. 136-6276

Brand RS Pro

Connection Thread Standard: NPT
Pressure Type: Electro-Mechanical
Voltage Rating: 30V

AED 342.84

in stock now

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RS PRO Pressure Switch -1 bar to 80 bar

RS Stock No. 235-4730

Brand RS Pro

Category: Vacuum Switches
Connection: G1/4
Suitable Media: Air, Inert Gas

AED 758.64

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RS PRO Pressure Switch -1 bar to 80 bar

RS Stock No. 235-4729

Brand RS Pro

Category: Vacuum Switches
Maximum Operating Pressure: 80 bar
Pressure Type: Vacuum

AED 690.34

in stock now

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RS PRO Pressure Switch 1 bar to 16 bar

RS Stock No. 136-6277

Brand RS Pro

Hazardous Area Certification: ATEX
IP Rating: IP67
Minimum Operating Pressure: 1bar

AED 653.20

in stock now

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RS PRO Digital Hydraulic Pressure Switch 0.1 kPa to 1 kPa

RS Stock No. 235-1193

Brand RS Pro

Connection: R 1/8 in
Minimum Operating Pressure: 0.1kPa
Pressure Type: Positive Pressure

AED 579.89

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RS PRO Digital Hydraulic Pressure Switch 0.1 kPa to 101 kPa

RS Stock No. 235-1199

Brand RS Pro

Maximum Operating Pressure: 0 → 101 kPa
Minimum Operating Pressure: 0.1kPa
Pressure Type: Positive Pressure

AED 569.33

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RS PRO Pressure Switch 0.2 bar to 4 bar

RS Stock No. 136-6270

Brand RS Pro

Maximum Operating Pressure: 4 bar
Maximum Pressure Setting: 4bar
Minimum Operating Pressure: 0.2bar

AED 407.61

in stock now

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RS PRO Pressure Switch 0.5 bar to 8 bar

RS Stock No. 136-6271

Brand RS Pro

Category: Vacuum Switches
IP Rating: IP67
Maximum Operating Pressure: 8 bar

AED 636.52

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RS PRO Pressure Switch 1 bar to 16 bar

RS Stock No. 136-6273

Brand RS Pro

Connection: M12 x 1
Connection Thread Standard: NPT
IP Rating: IP67

AED 660.73

in stock now

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RS PRO Pressure Switch 1 bar to 30 bar

RS Stock No. 136-6274

Brand RS Pro

Category: Vacuum Switches
Connection: M12 x 1
Connection Thread Standard: NPT

AED 510.86

in stock now

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RS PRO Pressure Switch 0.2 bar to 2 bar

RS Stock No. 136-6275

Brand RS Pro

Connection Thread Size: M12 x 1
Minimum Operating Temperature: 0°C
Pressure Setting Range: 0.2 to 2bar

AED 530.01

in stock now

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RS PRO Digital Hydraulic Pressure Switch 0.1 kPa to 1 kPa

RS Stock No. 235-1198

Brand RS Pro

Category: Vacuum Switches
Minimum Operating Pressure: 0.1kPa
Suitable Media: Air, Gas, Liquid

AED 566.36

in stock now

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RS PRO Pressure Switch SPDT 0 bar to 420 bar

RS Stock No. 235-4732

Brand RS Pro

Maximum Operating Pressure: 420 bar
Minimum Operating Pressure: 0bar
Suitable Media: Oil

AED 880.60

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RS PRO Pressure Switch NC 2 bar to 40 bar

RS Stock No. 296-9989

Brand RS Pro

Connection: G 1/4
Connection Thread Size: 1/4 in
Type: Adjustable

AED 976.77

in stock now

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RS PRO Pressure Switch NC 50 bar to 400 bar

RS Stock No. 297-0030

Brand RS Pro

Connection Thread Size: 1/4 in
Connection Thread Standard: G
Minimum Pressure Setting: 0bar

AED 976.77

in stock now

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RS PRO Pressure Switch NC 5 bar to 50 bar

RS Stock No. 297-0068

Brand RS Pro

Maximum Pressure Setting: 200bar
Pressure Setting Range: 0 to 200bar
Pressure Type: Positive Pressure

AED 300.48

in stock now

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RS PRO Pressure Switch NC 10 bar to 100 bar

RS Stock No. 297-0074

Brand RS Pro

Connection: G 1/4
Connection Thread Size: 1/4 in
Minimum Operating Temperature: -25°C

AED 300.48

in stock now

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RS PRO Pressure Switch NC 20 bar to 400 bar

RS Stock No. 297-0080

Brand RS Pro

Maximum Pressure Setting: 300bar
Minimum Operating Temperature: -25°C
Pressure Type: Positive Pressure

AED 301.83

in stock now

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RS PRO Pressure Switch NC 10 bar to 100 bar

RS Stock No. 363-5996

Brand RS Pro

Contact Operation: Normally Closed, Normally Open
Minimum Operating Temperature: -20°C
Minimum Pressure Setting: 0bar

AED 432.15

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RS PRO Pressure Switch NC 5 bar to 100 bar

RS Stock No. 296-9995

Brand RS Pro

Connection Thread Standard: G
Maximum Pressure Setting: 300bar
Suitable Media: Oil

AED 976.77

in stock now

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RS PRO Pressure Switch NC 20 bar to 200 bar

RS Stock No. 297-0002

Brand RS Pro

Connection Thread Size: 1/4 in
IP Rating: IP65
Output Type: NO/NC

AED 976.77

in stock now

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110

What is a pressure switch?

A pressure switch is an electromechanical device that detects a specific pressure level in a system and closes or opens an electrical circuit when that threshold is reached. It converts a physical pressure input into an electrical output, allowing control systems to start or stop pumps, alarms, compressors, or valves. Pressure switches come in various forms, including diaphragm pressure switches, piston pressure switches, and differential pressure switches, and are used across HVAC, water systems, hydraulic and pneumatic applications, and industrial automation.

Key sensing elements include diaphragms or pistons that deflect under pressure
Output configurations commonly include SPST (on/off) and SPDT (changeover) contacts
These devices can be adjustable or fixed-setpoint, depending on the model

How does a pressure switch work and what types exist?

At its core, a pressure switch uses a sensing element (often a diaphragm or a piston) that responds to fluid or air pressure. When the pressure reaches the preset setpoint, a mechanical movement drives a contact to open or close, completing or breaking an electrical circuit. There are several common types:

Diaphragm pressure switches: Flexible membrane transduces pressure into a displacement that triggers the switch. They are well suited for clean liquids and gases and offer compact, corrosion-resistant options.
Piston pressure switches: A rigid piston translates pressure into movement, enabling robust operation in higher pressure ranges and rugged environments.
Differential pressure switches: Monitor the difference between two pressures (P1 and P2) to detect filter loading, flow changes, or filter clogging in HVAC and filtration systems.

Typical contact configurations include SPST-NO, SPST-NC, and SPDT, with adjustable or fixed setpoints. Some models provide multiple setpoints, hysteresis control, and electrical ratings suitable for AC or DC circuits.

How do I choose a pressure switch for my application?

Selecting the right pressure switch involves matching the device to your operating environment, media, and electrical requirements. Consider the following factors:

Ensure the switch operates within your system’s minimum and maximum pressures, with an adjustable range if future variations are expected.
Choose materials (brass, stainless steel, wetted parts) compatible with air, water, oil, refrigerants, or corrosive fluids.
Pick thread types (G, NPT, BSP) and port sizes that match your piping or tubing.
Determine voltage, current, and whether you need SPST, SPDT, normally open, or normally closed contacts.
Consider IP ratings, temperature range, and enclosure styles for flameproof, washdown, or dusty environments.
Decide on diaphragm versus piston designs, and materials like brass or stainless steel based on corrosion resistance and mechanical life.
Look for certifications (UL, CE, ATEX, IECEx) relevant to your industry.

A good practice is to map your system’s required response time, hysteresis (the gap between cut-in and cut-out pressures), and the need for adjustments to select a model that minimizes nuisance alarms and ensures reliable operation.

What are differential pressure switches and where are they used?

Differential pressure switches monitor the difference between two pressure points rather than a single pressure. They are widely used to:

Measure filter condition in air and liquid filtration systems
Control fan speed or pump operation in HVAC and water processing
Detect clogged nozzles, blocked vents, or flow restrictions in industrial processes

These switches aid proactive maintenance by triggering alarms or controlling equipment when the pressure drop exceeds a preset threshold, helping avoid system inefficiency or damage. The sensing elements can be diaphragm-based or piston-based, and outputs can be SPST or SPDT with adjustable setpoints.

What are common materials, connections, and installation considerations for pressure switches?

Common materials include brass bodies with stainless-steel wetted parts for corrosion resistance in water and chemical environments, and stainless steel or high-grade alloys for high-pressure or high-temperature service. Port connections often use G1/4, 1/4" NPT, or M20 threads, with compatibility to pipe fittings and quick-connect tubing.

Choose material compatibility with the system fluid to avoid degradation or leakage
Verify port thread size and installation orientation to prevent backflow and ensure accurate sensing
Use proper mounting hardware and consider vibration isolation to extend life
Protect electrical connections from moisture and contaminants; employ appropriate enclosures for safety

Proper calibration and periodic maintenance help maintain accuracy. Where necessary, differential measurements should be revalidated after installation changes or fluid property shifts.

What are typical electrical configurations and how do I wire a pressure switch?

Most pressure switches provide simple control outputs compatible with industrial controllers and relays:

SPST-NO: Close the circuit when the setpoint is reached; opens when below setpoint
SPST-NC: Open the circuit at setpoint; closes when below setpoint
SPDT: Common terminal with a normally open and a normally closed contact, offering a changeover output

When wiring, ensure the supply voltage matches the switch rating, use appropriate fusing, and observe safety precautions. If the load draws significant current, use a suitable relay or contactor to handle the load safely, and consider wiring in a control circuit with proper isolation and protection.

What related products should I consider with pressure switches?

For comprehensive system control and monitoring, RS Components offers a range of related devices:

Pressure transducers and pressure sensors for precise measurement and digital interfacing
Flow switches and differential pressure transmitters for monitoring flow and pressure dynamics
Solenoid valves and pneumatic cylinders to actuate controlled responses based on pressure
Pumps, regulators, and filters to maintain stable pressure conditions
Gauges and test equipment for calibration and verification
Wiring, enclosures, and mounting hardware to complete safe, reliable installations

By pairing a pressure switch with compatible transmitters, regulators, and control components, you can design robust automation and safety systems across HVAC, industrial, and process industries.

How do I install and maintain a pressure switch safely?

Safe installation and maintenance extend the life of a pressure switch and improve system reliability:

Power off and depressurize the system before installation or servicing
Check for compatibility with media, temperature, and environmental conditions
Mount the switch in an orientation that aligns with the sensing element’s design and avoids vibration hotspots
Ensure correct electrical connections and proper strain relief for cables
Conduct a leak test after installation and verify setpoints and hysteresis
Periodically inspect for corrosion, residue buildup, or mechanical wear, and recalibrate if necessary

If the system uses hazardous fluids or high pressure, follow relevant safety standards and use approved accessories to maintain integrity and safety.

Switches Karcher Pressure Washers Pressure pump Pressure transmitters Pressure regulating valve 220 junction box Abb power supply CK Screwdrivers ABB Safeball Vishay 561R

"Pressure switch"

RS PRO Pressure Switch -1 bar to 15 bar

RS PRO Pressure Switch -1 bar to 3 bar

RS PRO Pressure Switch NC 1 bar to 10 bar

RS PRO Pressure Switch 0.5 bar to 8 bar

RS PRO Pressure Switch -1 bar to 80 bar

RS PRO Pressure Switch -1 bar to 80 bar

RS PRO Pressure Switch 1 bar to 16 bar

RS PRO Digital Hydraulic Pressure Switch 0.1 kPa to 1 kPa

RS PRO Digital Hydraulic Pressure Switch 0.1 kPa to 101 kPa

RS PRO Pressure Switch 0.2 bar to 4 bar

RS PRO Pressure Switch 0.5 bar to 8 bar

RS PRO Pressure Switch 1 bar to 16 bar

RS PRO Pressure Switch 1 bar to 30 bar

RS PRO Pressure Switch 0.2 bar to 2 bar

RS PRO Digital Hydraulic Pressure Switch 0.1 kPa to 1 kPa

RS PRO Pressure Switch SPDT 0 bar to 420 bar

RS PRO Pressure Switch NC 2 bar to 40 bar

RS PRO Pressure Switch NC 50 bar to 400 bar

RS PRO Pressure Switch NC 5 bar to 50 bar

RS PRO Pressure Switch NC 10 bar to 100 bar

RS PRO Pressure Switch NC 20 bar to 400 bar

RS PRO Pressure Switch NC 10 bar to 100 bar

RS PRO Pressure Switch NC 5 bar to 100 bar

RS PRO Pressure Switch NC 20 bar to 200 bar

What is a pressure switch?

How does a pressure switch work and what types exist?

How do I choose a pressure switch for my application?

What are differential pressure switches and where are they used?

What are common materials, connections, and installation considerations for pressure switches?

What are typical electrical configurations and how do I wire a pressure switch?

What related products should I consider with pressure switches?

How do I install and maintain a pressure switch safely?