HA42B6-B212 by Danaher

The HA42B6-B212 is an electromechanical timer produced by Danaher for the Timers and Controllers series. It serves as a standalone timing element that introduces precise, adjustable delays in industrial automation lines, coordinating devices such as contactors, index drives, or feed mechanisms without relying on software-based controllers. A panel-mounted dial on the front face lets operators set the required interval, while the internal gearing and clutch isolate the timing train from shock loads so the product maintains accuracy during repetitive duty cycles.

The prime mover inside the housing is a synchronous motor, so its rotational speed remains constant whenever mains power is present. A dial turn ratio of 20:1 stretches one full knob revolution into twenty turns of the timing gear, providing fine resolution over short delay ranges. Output contacts are rated at 15 A, allowing the timer to switch small motors, solenoid valves, or heater banks directly. Operation is synchronized with a supply frequency of 60 Hz, ensuring that each gear tooth advances at a predictable rate. The scale supports a maximum timing duration of 120 s, which is suitable for indexing, purge cycles, or dwell periods that fall within a two-minute window.

A clutch actuated by a solenoid engages the gear train only when the start coil is energized, preventing premature dial movement. After the cycle, an electric reset returns the pointer, so no manual intervention is necessary between repeated operations. The silver-faced contacts minimize contact resistance and heat buildup during high-current switching. The circuitry accepts a line supply of 240 V AC, matching common single-phase control transformers used in North American plants. The outer dial has a diameter of 4 inches, improving readability from a distance and allowing operators to confirm settings while the machine is operating.