AMF Potter & Brumfield CHB-38-7000 Time Delay On Operate Adjustable Relay

The AMF Potter & Brumfield CHB-38-7000 is a vintage plug-in time delay relay designed for delay-on-make (delay on operate) functionality, providing adjustable timing from 0.1 to 10 seconds. Manufactured by the Potter & Brumfield division of AMF (American Machine and Foundry), this electromechanical relay is ideal for industrial control applications such as motor starting, process control, and automation systems where precise timing is required to prevent simultaneous activation of components or to sequence operations. Key features include an octal socket plug-in design for easy installation and replacement, a front-mounted adjustment knob for on-the-fly timing changes without tools, and robust construction suitable for harsh environments. Advantages over similar products include its reliability in high-vibration settings, long service life due to mechanical timing mechanisms, and compatibility with legacy systems still in use in manufacturing and HVAC controls. However, drawbacks may include higher power consumption compared to modern solid-state relays and potential obsolescence, making sourcing replacements challenging. This model excels in applications requiring simple, cost-effective timing without digital interfaces, offering better electromagnetic interference resistance than some electronic alternatives. Overall, it's a dependable choice for maintaining older equipment, with proven performance in industrial settings.