The Castair PSAD15-230 is a pressure switch with an adjustable operating range of 15-230 PSI, on/off control, no integral unloader valve, and an adjustable differential. This is a heavy-range pressure switch designed for Cast Air compressors that operate at pressures significantly higher than the typical shop 90-150 PSI range — the 230 PSI upper limit puts this in the high-pressure industrial and specialty compressor territory. The adjustable differential means the cut-in and cut-out pressure spread can be set to match your application's demand cycle rather than being fixed at the factory setting.
Note: Cast Air did not provide a dedicated manufacturer product page for this switch. Specifications are drawn from the product listing. At $239.97, this is the highest-priced pressure switch in the Cast Air lineup — appropriate for specialty high-pressure applications. Call us to confirm compatibility and application suitability before ordering.
Understanding the Pressure Switch Specifications
Operating Range: 15-230 PSI
This switch can be set to cut in (start the compressor) anywhere from 15 PSI up to the cut-out pressure, and cut out (stop the compressor) at pressures up to 230 PSI. For reference, standard shop pressure switches top out at 145-175 PSI. The PSAD15-230 is for applications where the compressor system operates above that — high-pressure inflation, specialty pneumatic systems, industrial process air at elevated pressures, or systems where high cutout pressure is needed to maintain adequate working pressure through a regulator or pressure drop in long line runs.
No Unloader Valve
This switch does not include an integral unloader valve. An unloader valve releases the pressure trapped in the head and outlet line when the compressor stops, allowing the motor to restart against atmospheric pressure rather than fighting residual compressed air in the cylinder. Without an unloader, the compressor motor must restart against whatever pressure remains in the system. This configuration is appropriate for compressors using a separate unloader mechanism, for systems with sufficient tank volume and pressure drop that head pressure is negligible at restart, or for specific system designs where the absence of an unloader is intentional. If your application requires an unloader, see the PSH1MIX instead.
Adjustable Differential
The differential is the spread between cut-in and cut-out pressure. On a fixed-differential switch, this spread is set at the factory (typically 30-40 PSI on standard switches). On the PSAD15-230, the differential is adjustable — you can set both the cut-out pressure and the differential independently. This allows you to optimize compressor cycling for your specific application: a narrow differential means the compressor cycles more frequently but the tank pressure stays more consistent; a wider differential means fewer cycles and more pressure swing.
When Does a Shop Need the PSAD15-230?
- High-pressure compressor application (above 175 PSI) where standard 145-175 PSI switches are not rated for the cutout pressure
- Application requiring adjustable differential to optimize compressor cycling for the demand pattern
- Replacing a failed PSAD15-230 or equivalent high-pressure adjustable switch on an existing Cast Air unit
- Industrial or specialty pneumatic systems with non-standard pressure requirements
- System design that uses a separate unloader mechanism, making an integral unloader switch unnecessary
PSAD15-230 vs. Standard Pressure Switches
- PSH1 — 145-175 PSI, no unloader — $36.31 — standard shop pressure switch, fixed differential, low cost
- PSH1MIX — 145-175 PSI, with unloader — $40.73 — standard range with integral unloader for motors that need it
- PSAD15-230 — 15-230 PSI, no unloader, adjustable differential — $239.97 (this unit) — high-pressure range, adjustable, for specialty applications
The large price difference between the PSH1 series and the PSAD15-230 reflects the higher-rated contacts, heavier-duty switching mechanism, and adjustable differential required for high-pressure and industrial service.
Technical Specifications
- Part Number: PSAD15-230
- Manufacturer: Cast Air (Castair)
- Pressure Range: 15-230 PSI
- Control Type: On/Off
- Unloader: None
- Differential: Adjustable
- Electrical Rating: Not confirmed in listing — call for voltage/amperage specifications
- Price: $239.97
- Manufacturer Data: Product page not available — specifications from product listing data
What Is Included
- 1x Castair PSAD15-230 pressure switch
Unloader valve, tubing, and installation fittings are not included. If an unloader is required for your application, it must be sourced and installed separately.
Why Buy From Air Compressor Factory Direct?
High-pressure pressure switches are not commodity items — the wrong switch in a high-pressure application creates a safety hazard if the contacts are not rated for the load or the pressure rating is insufficient. We have been selling Cast Air components since 2016 and can confirm whether the PSAD15-230 is the correct switch for your system before you order. If you need to discuss pressure switch selection, electrical ratings, or unloader requirements, call us — that is exactly what our tech support team is here for. Free shipping, full warranty.
- Cast Air specialist since 2016
- Free shipping on all orders
- Free tech support — we verify pressure switch suitability for your application
- Full manufacturer warranty
- Safety-first guidance — we will not let you order the wrong pressure rating
Call 866-217-0063 for quick answers and help!
