Product Description:

The HP56A6 is an electromechanical interval timer manufactured by Danaher as part of the Timers and Controllers series. It is intended for panel mounting in automated equipment where a fixed delay must elapse before a circuit opens or closes. A synchronous motor drives a cam stack while a magnetic clutch engages the mechanism, allowing machine builders to implement repeatable startup delays, soak periods, or shutdown sequences without relying on software timers. This operating method provides a direct mechanical timing function for equipment that requires consistent control without digital programming.

Electrical operation centers on a supply of 120 VAC at 60 Hz, which keeps the motor’s rotation synchronized with the power supply. The front dial is graduated in one-minute divisions, accepts a minimum setting of two minutes, and reaches a maximum of 60 minutes, covering most medium-length process delays. When voltage is applied, the clutch engages within 28 ms. When power is removed, it disengages after 17 ms, so transition errors remain small compared with the selected interval. The timer draws 2.45 VA through the motor and 10.5 VA through the clutch. A mechanical or electrical reset can clear the cycle in 0.5 seconds, enabling rapid successive operations.

The isolated output path has a rating of 10 A resistive at 120 VAC, allowing it to switch heaters, lamps, or solenoid valves directly. Under a light 1 A load, the contacts have an operating life of 5,000,000 cycles, while full-load endurance reaches 250,000 operations. Timing consistency across the entire range has a repeat accuracy of ±18 seconds, which is suitable for sawtooth, dwell, or batch applications that do not demand subsecond precision. The enclosure weighs 2 lb 14 oz, allowing it to be mounted on a panel door without additional support. Its internal design helps keep contaminants away from the dial and gearing during extended service intervals.