HG102A607 by Danaher

The HG102A607 is a dial-based industrial timer manufactured by Danaher for the Timers and Controllers series. It fits standard control panels and provides a repetitive on-off output that replaces complex PLC logic when only a fixed duty cycle is required. Operators use the analog scale to set the energized and de-energized periods, while an internal cam and microswitch assembly cycles the load at consistent intervals. This design makes the unit suitable for lubricators, heaters, and small conveyors that must alternate power without continuous supervision.

The timer is powered by a single-phase supply of 120 VAC at 60 Hz, so it can be wired directly to common plant mains. It operates in an on-off repeat-cycle mode, and the front dial spans from a minimum setting of 2 s to a maximum interval of 150 s, allowing the cycle length to be matched to process requirements. A mechanical dial lock prevents accidental adjustment after the desired timing values have been set. Repeat accuracy remains within 0.5% of the dial setting, limiting drift during long production runs. The internal mechanism allows up to two seconds of dwell during contact transfer, helping prevent interruptions to downstream equipment.

The cam drive has a mechanical life of 10,000,000 operations, while the silver-alloy contacts have an electrical life of 250,000 operations under a 10 A, 120 VAC resistive load. Two independent Form C outputs are available through a 2 SPDT arrangement, enabling simultaneous control of separate circuits. Despite its long service life, the timer imposes a power burden of only 2.5 VA on the control transformer, minimizing heat in crowded enclosures. Continuous operation is permitted from -20 °F to 140 °F, so the device can be mounted in unconditioned panels on factory floors or outdoor skids. The mechanical drive and silver-alloy contacts support repetitive switching in applications that operate for extended periods without manual control.