Overview
The Ashcroft B424V pressure switch is a field-proven general-purpose instrument designed for precise pressure monitoring and control in HVAC, refrigeration, and industrial systems. With a 0–30 PSI operating range, fixed deadband, and single-pole double-throw (SPDT) switching action, this switch delivers reliable pressure-activated control in a compact, cost-effective package suitable for system integration into standard piping and manifold configurations.
Key Features
- SPDT switching action — Flexible normally-open or normally-closed circuit configurations without additional hardware
- Viton seal — Superior chemical resistance and compatibility with refrigerants, oils, and process media
- NEMA 4X watertight enclosure — Protects against dust, dirt, rain, splashing water, and corrosion for indoor and outdoor use
- 1/4″ NPT connection — Straightforward integration into standard industrial piping systems
- Compact, low-cost design — Space-saving form factor with fixed deadband for stable pressure control
Technical Specifications
- Pressure range: 0–30 PSI
- Switching type: SPDT (Single-Pole Double-Throw)
- Contact rating: 15 A @ 125/250 VAC
- DC rating: 1/4 A @ 125 VDC (estimated)
- Process connection: 1/4″ NPT male
- Diaphragm/actuator material: Viton
- Enclosure: NEMA 3, 4, 4X, 13 rated
- Ambient operating temperature: –20 to 150 °F
- Accuracy: ±1% of span
Typical Applications
- HVAC and air conditioning pressure monitoring
- Refrigeration system control and alarm functions
- Pump and compressor protection
- Industrial hydraulic system pressure control
- Water treatment and filtration system monitoring
- General-purpose pressure-activated switching in OEM equipment
Compatibility & Replacements
Compatible With
- Standard industrial pressure piping and manifold systems
- 120/240V control circuits
- Low-pressure HVAC and refrigeration circuits (0–30 PSI)
- General automation and PLC control systems
- Boiler, burner, and process equipment requiring pressure interlocks
Replaces / Drop-In Replacement For
- Ashcroft B424V-30 (equivalent model designation)
- Other SPDT 0-30 PSI pressure switches with 1/4″ NPT connection
Works With
- Pneumatic and hydraulic control systems
- Low-pressure refrigerant and air systems
- Industrial automation relay logic and contactor circuits
- HVAC control panels and building management systems
