Pressure Switches

Pressure Switches — New & Used

Pressure switches are control devices that activate or deactivate electrical circuits in response to changes in fluid or air pressure. Designed for both hydraulic and pneumatic systems, these switches ensure safe operation by maintaining consistent pressure levels, preventing overloads, and automating start/stop functions in pumps, compressors, and process systems. Available in adjustable, differential, and electronic styles, they deliver reliable performance in demanding industrial and OEM environments.

At Surplus Select, we stock a wide selection of new and used OEM pressure switches from trusted manufacturers such as Honeywell, Ashcroft, Square D, WIKA, and Parker. Our inventory updates daily, offering surplus pricing on precision pressure control components for MRO and automation applications.

Price Match — We match any authorized distributor on identical in-stock parts, so you can source parts at surplus pricing with distributor-level assurance.

Trade-In Credit — Have quality new surplus items? Trade them in for store credit toward the parts you actually need.

Fast U.S. Shipping — Most orders ship same or next business day from our U.S. warehouse to keep your line running.

Find Your Switch Fast (Search-First)

Search your part number (e.g., 9013FHG, PSF101, H905, PX3).
No PN? Try specs: “100 PSI adjustable pressure switch” or “differential air switch”.
Need a specific OEM? Add the brand (e.g., Honeywell or Square D).

Applications & Use Cases

Pumps & compressors: Automatically start or stop systems based on pressure thresholds.
Hydraulic & pneumatic circuits: Protect against overpressure or low-pressure conditions.
HVAC & refrigeration systems: Monitor line pressure to ensure safe and efficient operation.
Industrial machinery: Integrate into safety or control loops for process automation.
MRO & system retrofits: Replace worn or obsolete pressure switches in OEM systems.

Why Buy Pressure Switches from Surplus Select

New & Used Options: Mechanical, electronic, and differential pressure switches at surplus pricing.
Trusted Brands: Honeywell, Ashcroft, Square D, WIKA, and Parker.
OEM Quality: Industrial-grade switches tested for consistent accuracy and performance.
Fast Shipping: Most orders ship same or next business day across the U.S.