Instant, Hands‑Free Protection for Your Pressure Washer System

A pressure activated switch with 3/8" MPT threads automatically turns power on or off based on the pressure in your line - no operator input required. This single component protects pumps, burners, and motors in pressure washers and similar high-pressure systems by responding instantly to changes in system pressure. The direct outcome is longer equipment life, safer operation, and smoother system control across every job.

Most pressure washers and high-pressure cleaning rigs cycle dozens of times per shift. Without a reliable pressure washer switch managing that cycle, you're gambling with overheated coils, cavitated pumps, and wasted money on premature repairs. The Barens Centurion pressure activated switch eliminates that risk. It threads into your 3/8" FPT port, monitors line pressure in real time, and handles the switching so you can focus on the work in front of you. Pressure-activated switches help protect systems from overpressure or underpressure conditions, and this one is purpose-built for the demands of professional cleaning equipment.

Why You'll Love Using a 3/8" MPT Pressure Activated Switch

If you're a contractor running a trailer rig, a fleet manager overseeing a busy wash bay, or a facilities team keeping heavy equipment clean, these are the benefits that actually matter on the job.

• Automatic power control linked to pressure – The moment line pressure rises above the activation threshold, the switch closes or opens the circuit - depending on your wiring configuration. When pressure drops back down (trigger gun released, flow restored), it resets. No guesswork, no manual shutoff steps. Pressure switches can automate machine operations by controlling equipment based on pressure conditions, and this one does it reliably, shift after shift.

• Protects pumps and burners from damage – When the trigger gun is released and back-pressure builds, the switch cuts power to your burner or motor before overheating or dry-fire damage can occur. This is critical in hot water pressure washers where a burner firing without water flow through the coil can cause catastrophic - and expensive - failure.

• Saves time on every job – You don't need to walk back to the machine to flip a switch or kill the burner manually. The pressure activated switch handles it automatically, so the operator stays at the wand and keeps working. Fewer interruptions mean faster job completion and more jobs per day.

• Improves system safety – Pressure-activated switches help prevent unexpected pressure spikes, accidental run-dry conditions, and over-pressurization. Pressure switches are commonly used in water systems, air compressors, HVAC systems, and industrial machinery - and in pressure washer applications, they're a frontline safety device.

• Built for daily use in harsh environments – Constructed with brass and stainless steel plunger, this switch is designed to handle the spray, vibration, chemicals, and temperature swings that come with professional cleaning work. The sealed electrical contacts and metal 3/8" MPT threads hold up to repeated install and removal without stripping or corroding.

• Simple to integrate – A 3/8 MPT connection ensures compatibility with high-pressure systems and simplifies installation. This is a standard port size across commercial pressure washer manifolds, unloader blocks, and accessory ports, so you can find the right fit without adapters or workarounds.

What Makes This 3/8" MPT Pressure Activated Switch Different

Most generic pressure switches give you vague activation specs, inconsistent sealing, and electrical ratings that don't hold up under real load. They might work for a season - then they're broken, leaking, or stuck in one position. The Barens Centurion pressure activated switch is built differently.

• Precise activation pressure – This switch activates at 580 PSI, giving you a predictable, repeatable trigger point that's well-suited for commercial pressure washers. No ambiguous ranges or wide tolerances - you know exactly when it fires. Pressure switches feature adjustable internal springs to configure setpoints and deadbands, and this unit's calibration sits in the sweet spot for professional cleaning systems.

• 3/8" MPT brass housing – The brass body with tapered male pipe threads resists corrosion and thread deformation far better than low-grade cast iron or plastic alternatives. The tapered thread design helps create a reliable seal in standard 3/8" FPT ports, reducing the chance of leaks that could spray water onto electrical terminals.

• High-amp electrical rating – Rated for 250 V and 15 amps, this switch can directly control burner solenoids, relay coils, and modest motor loads without requiring heavy external relays. The Mecline pressure switch also operates at 15 amps - this is the standard for professional-grade pressure switches because it covers the realistic electrical loads you'll encounter in the field.

• Support for normally open or normally closed wiring – Pressure switches can be normally closed or normally open, and this one supports both configurations. Wire it to cut power when pressure builds (pump shutoff when gun is released), or wire it to enable power when pressure rises (burner fires only when water is flowing). Three-wire terminal design gives you the flexibility to match your system's control logic without altering the switch internals.

• Engineered for pressure washer duty – A common application of pressure switches is in pressure washers to manage flow and pressure during operation. This switch is designed for continuous duty, pulsating flow, and the frequent cycling that cleaning applications demand. It won't chatter or short-cycle under the rapid on-off patterns of a busy wash day.

How a Pressure Activated Switch 3/8" MPT Works in Your System

This is a pressure-sensing electrical switch that mounts directly in your high-pressure line via 3/8" MPT threads. Inside, a calibrated spring and stainless steel plunger respond to fluid pressure changes and actuate a snap-action micro-switch. Here's how the operation breaks down in practice.

Step‑by‑Step Operation

1. Install the switch in the pressure line – Thread the switch into a 3/8" FPT port on your manifold, unloader block, or piping. Use PTFE tape or appropriate pipe thread sealant on the male threads. Make sure threads are clean and the system is fully depressurized before you start.

2. Connect the electrical leads – Identify the common, normally open, and normally closed terminals. Connect two or three wires into your control circuit - pump motor, burner solenoid, or control relay - according to the wiring logic your system requires. Use insulated connectors and strain relief, especially if the switch is exposed to vibration.

3. Pressure rises during operation – When the trigger gun closes or system pressure builds to the 580 PSI activation threshold, the fluid force overcomes the internal spring and moves the plunger. That motion actuates the micro-switch, changing its state.

4. Circuit opens or closes – Depending on your wiring configuration, the switch either cuts power (shutting down the motor or burner) or enables power (allowing the burner to fire). In a typical hot water setup, the switch closes the burner circuit when pressure confirms water is flowing through the heating coil.

5. Pressure drops, system resets – When pressure falls back below the reset threshold - trigger gun opened, flow restored - the spring returns the plunger to its resting position. The switch returns to its normal state and the equipment restarts or shuts off accordingly. The difference between the activation pressure and the release pressure (the deadband) prevents rapid cycling or chatter.

Think of the flow like this: Water pressure builds → plunger moves → micro-switch changes state → circuit opens or closes → equipment responds. When pressure drops, everything reverses. It's simple, mechanical, and reliable - no electronics, no programming, no batteries.

Product Details: 3/8" MPT Pressure Activated Switch Specs

Quick reference for installers and specifiers. Check these specs against your system before you add to cart and purchase.

• Material / Body – Brass pressure body with stainless steel plunger and corrosion-resistant internals. Suitable for typical pressure washer detergents, cold water, and warm water applications.

• Thread type and size – 3/8" MPT (male pipe thread), tapered per NPT standard. Designed to seal in standard 3/8" FPT ports found on most commercial manifolds and accessory blocks.

• Activation pressure – Activates at 580 PSI. Resets at a lower threshold to provide a clean deadband and prevent short-cycling.

• Maximum pressure rating – Maximum pressure rating is 3600 PSI. Many industrial pressure switches support high-pressure applications up to several thousand PSI, and this unit covers the bulk of commercial cleaning systems.

• Electrical rating – Rated for 250 V and 15 amps. Suitable for direct control of burner solenoids, relay coils, and modest loads. For larger motor loads, use this switch to trigger a contactor or relay.

• Switch function – Supports normally open and normally closed wiring configurations. Three-wire terminal design (common, N.O., N.C.) for maximum flexibility. Pressure switches include flow switches and toggle switches - this is a pressure-actuated type with snap-action contacts.

• Temperature limits – Operates at a maximum temperature of 190 degrees F. Suitable for hot water pressure washers and light industrial environments. Do not exceed this limit - high temperatures risk warping seals and degrading internal springs.

• Ingress protection – Protective housing over electrical terminals resists spray, moisture, and jobsite grime. Weather-sealed design holds up in outdoor and wet environments.

• Included in the box – Switch assembly with terminal hardware and wiring leads. Installation and wiring guide included for both N.O. and N.C. configurations.

Who a 3/8" MPT Pressure Activated Switch Is For

This switch is designed for professional and serious DIY systems that need reliable, pressure-based control without constant operator attention.

• Pressure washing contractors – Skid and trailer-mounted rigs that need automatic pump or burner shutoff when the gun is released. The 580 PSI activation point and 3600 PSI maximum rating fit the majority of commercial pressure washers in daily use.

• Fleet and facility wash bays – Fixed installations where multiple operators cycle equipment on and off all day. Consistent, automatic protection means fewer broken components and less downtime between vehicles.

• Agricultural and industrial users – Barn sanitation, equipment wash pads, and process rinse systems that rely on pressure-triggered control logic. Professional installations often consider factors like pressure range, electrical ratings, and compatibility with fluids - and this switch checks all three boxes.

• OEMs and equipment builders – Manufacturers integrating 3/8" MPT ports into manifolds who want a drop-in pressure switch for their control panels. Standard thread size, standard electrical ratings, predictable activation - order the quantity you need and build it right into your design.

If you need safer, more automatic control of a high-pressure system, this switch is the right fit.

Frequently Asked Questions About Pressure Switches and Pressure Activated Switches (3/8" MPT)

Is a 3/8" MPT pressure activated switch easy to install? Yes. Installation is straightforward for anyone familiar with basic plumbing and electrical work. Thread the switch into a 3/8" FPT port with appropriate sealant, then connect two or three wires per the included wiring diagram. Always depressurize the system and disconnect power before any work - this is non-negotiable for safety.

Will it work with my existing pressure washer? If your system has a spare 3/8" FPT pressure port and uses compatible voltage and amp ratings, it can usually be retrofitted. Check your pump, burner, or motor data and control panel wiring before installation. The PA pressure switch activates at 580 PSI and has a maximum pressure of 3600 PSI - confirm your system's working pressure falls within that range.

How long does a pressure activated switch typically last? Under normal operation with clean fluid and correct wiring, it can run for many seasons, cycling thousands of times. Lifespan depends on avoiding water ingress into the electrical side, respecting the 190 °F temperature limit, and keeping the fluid free of heavy sediment or scale.

What maintenance does it need? Periodic visual inspection is all that's required. Check for leaks at the 3/8" MPT threads, corrosion at terminals, and cracked boots or insulation. There are no user-serviceable internal parts. If the switch fails to activate reliably or drifts from its setpoint, replacement is the recommended course of action.

What happens if the switch fails? Common failure modes include stuck open (equipment won't start), stuck closed (equipment won't shut off automatically), and intermittent contact (erratic operation). If you notice any of these, immediately isolate power and diagnose the issue. Do not bypass a failed pressure switch - it's there for safety. Replace it and move on.

Ready to Add Smart Protection to Your Pressure System?

Stop throwing money at avoidable pump and burner repairs. The Barens Centurion pressure activated switch with 3/8" MPT threads gives you automatic, pressure-based control that protects your equipment and simplifies daily operation. Constructed with brass and stainless steel plunger, rated for 250 V and 15 amps, and activating precisely at 580 PSI, it's the component your system has been missing.

Pressure Activated Switch 3/8" MPT – What It Does and Why It Matters

Instant, Hands‑Free Protection for Your Pressure System

A pressure activated switch with 3/8" MPT threads automatically turns power on or off based on the pressure in your line - no operator input required. This single component protects pumps, burners, and motors in pressure washers and similar high-pressure systems by responding instantly to changes in system pressure. The direct outcome is longer equipment life, safer operation, and smoother system control across every job.

Most pressure washers and high-pressure cleaning rigs cycle dozens of times per shift. Without a reliable pressure washer switch managing that cycle, you're gambling with overheated coils, cavitated pumps, and wasted money on premature repairs. The Barens Centurion pressure activated switch eliminates that risk. It threads into your 3/8" FPT port, monitors line pressure in real time, and handles the switching so you can focus on the work in front of you. Pressure-activated switches help protect systems from overpressure or underpressure conditions, and this one is purpose-built for the demands of professional cleaning equipment.

Why You'll Love Using a 3/8" MPT Pressure Activated Switch

If you're a contractor running a trailer rig, a fleet manager overseeing a busy wash bay, or a facilities team keeping heavy equipment clean, these are the benefits that actually matter on the job.

• Automatic power control linked to pressure – The moment line pressure rises above the activation threshold, the switch closes or opens the circuit - depending on your wiring configuration. When pressure drops back down (trigger gun released, flow restored), it resets. No guesswork, no manual shutoff steps. Pressure switches can automate machine operations by controlling equipment based on pressure conditions, and this one does it reliably, shift after shift.

• Protects pumps and burners from damage – When the trigger gun is released and back-pressure builds, the switch cuts power to your burner or motor before overheating or dry-fire damage can occur. This is critical in hot water pressure washers where a burner firing without water flow through the coil can cause catastrophic - and expensive - failure.

• Saves time on every job – You don't need to walk back to the machine to flip a switch or kill the burner manually. The pressure activated switch handles it automatically, so the operator stays at the wand and keeps working. Fewer interruptions mean faster job completion and more jobs per day.

• Improves system safety – Pressure-activated switches help prevent unexpected pressure spikes, accidental run-dry conditions, and over-pressurization. Pressure switches are commonly used in water systems, air compressors, HVAC systems, and industrial machinery - and in pressure washer applications, they're a frontline safety device.

• Built for daily use in harsh environments – Constructed with brass and stainless steel plunger, this switch is designed to handle the spray, vibration, chemicals, and temperature swings that come with professional cleaning work. The sealed electrical contacts and metal 3/8" MPT threads hold up to repeated install and removal without stripping or corroding.

• Simple to integrate – A 3/8 MPT connection ensures compatibility with high-pressure systems and simplifies installation. This is a standard port size across commercial pressure washer manifolds, unloader blocks, and accessory ports, so you can find the right fit without adapters or workarounds.

What Makes This 3/8" MPT Pressure Activated Switch Different

Most generic pressure switches give you vague activation specs, inconsistent sealing, and electrical ratings that don't hold up under real load. They might work for a season - then they're broken, leaking, or stuck in one position. The Barens Centurion pressure activated switch is built differently.

• Precise activation pressure – This switch activates at 580 PSI, giving you a predictable, repeatable trigger point that's well-suited for commercial pressure washers. No ambiguous ranges or wide tolerances - you know exactly when it fires. Pressure switches feature adjustable internal springs to configure setpoints and deadbands, and this unit's calibration sits in the sweet spot for professional cleaning systems.

• 3/8" MPT brass housing – The brass body with tapered male pipe threads resists corrosion and thread deformation far better than low-grade cast iron or plastic alternatives. The tapered thread design helps create a reliable seal in standard 3/8" FPT ports, reducing the chance of leaks that could spray water onto electrical terminals.

• High-amp electrical rating – Rated for 250 V and 15 amps, this switch can directly control burner solenoids, relay coils, and modest motor loads without requiring heavy external relays. The Mecline pressure switch also operates at 15 amps - this is the standard for professional-grade pressure switches because it covers the realistic electrical loads you'll encounter in the field.

• Support for normally open or normally closed wiring – Pressure switches can be normally closed or normally open, and this one supports both configurations. Wire it to cut power when pressure builds (pump shutoff when gun is released), or wire it to enable power when pressure rises (burner fires only when water is flowing). Three-wire terminal design gives you the flexibility to match your system's control logic without altering the switch internals.

• Engineered for pressure washer duty – A common application of pressure switches is in pressure washers to manage flow and pressure during operation. This switch is designed for continuous duty, pulsating flow, and the frequent cycling that cleaning applications demand. It won't chatter or short-cycle under the rapid on-off patterns of a busy wash day.

How a Pressure Activated Switch 3/8" MPT Works in Your System

This is a pressure-sensing electrical switch that mounts directly in your high-pressure line via 3/8" MPT threads. Inside, a calibrated spring and stainless steel plunger respond to fluid pressure changes and actuate a snap-action micro-switch. Here's how the operation breaks down in practice.

Step‑by‑Step Operation

1. Install the switch in the pressure line – Thread the switch into a 3/8" FPT port on your manifold, unloader block, or piping. Use PTFE tape or appropriate pipe thread sealant on the male threads. Make sure threads are clean and the system is fully depressurized before you start.

2. Connect the electrical leads – Identify the common, normally open, and normally closed terminals. Connect two or three wires into your control circuit - pump motor, burner solenoid, or control relay - according to the wiring logic your system requires. Use insulated connectors and strain relief, especially if the switch is exposed to vibration.

3. Pressure rises during operation – When the trigger gun closes or system pressure builds to the 580 PSI activation threshold, the fluid force overcomes the internal spring and moves the plunger. That motion actuates the micro-switch, changing its state.

4. Circuit opens or closes – Depending on your wiring configuration, the switch either cuts power (shutting down the motor or burner) or enables power (allowing the burner to fire). In a typical hot water setup, the switch closes the burner circuit when pressure confirms water is flowing through the heating coil.

5. Pressure drops, system resets – When pressure falls back below the reset threshold - trigger gun opened, flow restored - the spring returns the plunger to its resting position. The switch returns to its normal state and the equipment restarts or shuts off accordingly. The difference between the activation pressure and the release pressure (the deadband) prevents rapid cycling or chatter.

Think of the flow like this: Water pressure builds → plunger moves → micro-switch changes state → circuit opens or closes → equipment responds. When pressure drops, everything reverses. It's simple, mechanical, and reliable - no electronics, no programming, no batteries.

Product Details: 3/8" MPT Pressure Activated Switch Specs

Quick reference for installers and specifiers. Check these specs against your system before you add to cart and purchase.

• Material / Body – Brass pressure body with stainless steel plunger and corrosion-resistant internals. Suitable for typical pressure washer detergents, cold water, and warm water applications.

• Thread type and size – 3/8" MPT (male pipe thread), tapered per NPT standard. Designed to seal in standard 3/8" FPT ports found on most commercial manifolds and accessory blocks.

• Activation pressure – Activates at 580 PSI. Resets at a lower threshold to provide a clean deadband and prevent short-cycling.

• Maximum pressure rating – Maximum pressure rating is 3600 PSI. Many industrial pressure switches support high-pressure applications up to several thousand PSI, and this unit covers the bulk of commercial cleaning systems.

• Electrical rating – Rated for 250 V and 15 amps. Suitable for direct control of burner solenoids, relay coils, and modest loads. For larger motor loads, use this switch to trigger a contactor or relay.

• Switch function – Supports normally open and normally closed wiring configurations. Three-wire terminal design (common, N.O., N.C.) for maximum flexibility. Pressure switches include flow switches and toggle switches - this is a pressure-actuated type with snap-action contacts.

• Temperature limits – Operates at a maximum temperature of 190 degrees F. Suitable for hot water pressure washers and light industrial environments. Do not exceed this limit - high temperatures risk warping seals and degrading internal springs.

• Ingress protection – Protective housing over electrical terminals resists spray, moisture, and jobsite grime. Weather-sealed design holds up in outdoor and wet environments.

• Included in the box – Switch assembly with terminal hardware and wiring leads. Installation and wiring guide included for both N.O. and N.C. configurations.

Who a 3/8" MPT Pressure Activated Switch Is For

This switch is designed for professional and serious DIY systems that need reliable, pressure-based control without constant operator attention.

• Pressure washing contractors – Skid and trailer-mounted rigs that need automatic pump or burner shutoff when the gun is released. The 580 PSI activation point and 3600 PSI maximum rating fit the majority of commercial pressure washers in daily use.

• Fleet and facility wash bays – Fixed installations where multiple operators cycle equipment on and off all day. Consistent, automatic protection means fewer broken components and less downtime between vehicles.

• Agricultural and industrial users – Barn sanitation, equipment wash pads, and process rinse systems that rely on pressure-triggered control logic. Professional installations often consider factors like pressure range, electrical ratings, and compatibility with fluids - and this switch checks all three boxes.

• OEMs and equipment builders – Manufacturers integrating 3/8" MPT ports into manifolds who want a drop-in pressure switch for their control panels. Standard thread size, standard electrical ratings, predictable activation - order the quantity you need and build it right into your design.

If you need safer, more automatic control of a high-pressure system, this switch is the right fit.

Frequently Asked Questions About Pressure Activated Switches (3/8" MPT)

Is a 3/8" MPT pressure activated switch easy to install? Yes. Installation is straightforward for anyone familiar with basic plumbing and electrical work. Thread the switch into a 3/8" FPT port with appropriate sealant, then connect two or three wires per the included wiring diagram. Always depressurize the system and disconnect power before any work - this is non-negotiable for safety.

Will it work with my existing pressure washer? If your system has a spare 3/8" FPT pressure port and uses compatible voltage and amp ratings, it can usually be retrofitted. Check your pump, burner, or motor data and control panel wiring before installation. The PA pressure switch activates at 580 PSI and has a maximum pressure of 3600 PSI - confirm your system's working pressure falls within that range.

How long does a pressure activated switch typically last? Under normal operation with clean fluid and correct wiring, it can run for many seasons, cycling thousands of times. Lifespan depends on avoiding water ingress into the electrical side, respecting the 190 °F temperature limit, and keeping the fluid free of heavy sediment or scale.

What maintenance does it need? Periodic visual inspection is all that's required. Check for leaks at the 3/8" MPT threads, corrosion at terminals, and cracked boots or insulation. There are no user-serviceable internal parts. If the switch fails to activate reliably or drifts from its set point, replacement is the recommended course of action.

What happens if the switch fails? Common failure modes include stuck open (equipment won't start), stuck closed (equipment won't shut off automatically), and intermittent contact (erratic operation). If you notice any of these, immediately isolate power and diagnose the issue. Do not bypass a failed pressure switch - it's there for safety. Replace it and move on.

Ready to Add Smart Protection to Your Pressure System?

Stop throwing money at avoidable pump and burner repairs. The Barens Centurion pressure activated switch with 3/8" MPT threads gives you automatic, pressure-based control that protects your equipment and simplifies daily operation. Constructed with brass and stainless steel plunger, rated for 250 V and 15 amps, and activating precisely at 580 PSI, it's the component your system has been missing.

Get it installed before your next busy season. Find the right pressure rating for your rig, add it to your cart, and thread it into your system. Your pumps and burners will thank you.