HP56B607 by Danaher

The HP56B607 is an electromechanical timer manufactured by Danaher for the Timers and Controllers series. Designed for panel-mounted sequencing, the unit converts a line-frequency reference into a precise delayed contact change that coordinates conveyors, heaters, or pump cycles inside automated equipment. A cam-driven dial allows users to set the required interval, while the internal clutch and synchronous motor ensure repeatable timing performance under industrial duty. Its purpose is to start or interrupt control circuits after a user-selected period, reducing the need for PLC capacity in simple machines.

Electrical interfacing is straightforward because the timer draws control power from a single-phase input of 240 VAC at 60 Hz. Output contacts are rated for a resistive load of 5 A at 240 VAC, and they can tolerate a momentary inrush of 10 A when inductive loads close. Up to 15 screw terminals are provided for contact, clutch, and reset wiring. The front dial can be secured by a dial lock, preventing unauthorized adjustment, and it provides a maximum setting of 60 minutes. Once energized, the magnetic circuit reaches the pickup point in 28 ms, so control circuits experience minimal delay.

After the timing cycle ends, the armature releases in 17 ms, and the spring-return mechanism resets completely in 0.5 seconds before the next cycle can start. Normal operation imposes a clutch burden of 10.5 VA, which should be considered when sizing control transformers. The silver-alloy contacts are rated for 5,000,000 cycles at 1 A and 250,000 operations at full load. The assembly withstands vibration up to 2.5 G without contact chatter, and it remains functional at ambient temperatures from -18 °C to 60 °C. With the longest interval selected, the synchronous motor and cam complete the full timing cycle in one hour.