McDonnell & Miller 150S-M-MD-HD Boiler Control HeadMcDonnell & Miller 150S M MD HD replaces 173302 with a robust 150 head, delivering precise boiler control through a reliable snap switch and a convenient manual reset. This high quality head features a durable construction with corrosion resistant components, designed to withstand vibration, temperature swings, and demanding industrial environments while maintaining accurate differential performance and long service life. Ideal for commercial and

FR-rated construction

and electrical enclosures

Actuation: Spring Pneumatic Actuator

Max Safe Operating Pressure: 5 PSI

Built to endure rigors of busy facilities

it supports flexible control workflows in industrial automation

The model pairs with R45695-003 and carries the 57W78 designation

1/2" sweat connections for easy sweating installation

24V DC coil with 24" lead

The enclosure is NEMA 1 and IP30 rated for durability in exposed settings

direct-mount device engineered for reliable pressure control in refrigeration and HVAC systems

and ANZ130361