Ashcroft B450B Pressure Control Switch

The Ashcroft B450B Pressure Control Switch is a rugged B-Series unit designed for reliable pressure control, shutdown, or alarm functions in industrial and OEM systems. The B450B400# variant indicates a 400 psi nominal range, with adjustable setpoints from 15% to 100% of the selected range and either fixed or limited adjustable deadband for precise on/off switching. It accepts a broad selection of switch elements and diaphragms (Buna-N, Viton, Teflon, Monel, and stainless variants) to match media compatibility, and is offered in enclosure configurations ranging from standard NEMA 4X to explosion-proof variants for hazardous environments. Electrical termination is typically 3/4" NPT female, with industry approvals including UL, CSA, CE, CRN, FM, and 3A, and certain configurations are SIL3 capable. Typical applications include process control in refineries, petrochemical plants, water and wastewater treatment, and general industrial automation where dependable pressure-based control or alarm signaling is required.