Sangamo Q559.2 24 Hour Time Switch - Round PAT 2 On/Off Early Off

The Sangamo Q559.2 is a 24-hour programmable time switch using a Round PAT 2 dial mechanism with on/off scheduling and an early off function. The electromechanical timer operates a 20A-rated switch suitable for controlling heating circuits, lighting circuits, water heaters and other timed loads up to 4,600W on 230V mains.

Designed for commercial energy management and residential applications where equipment needs to run on a fixed daily schedule, the time switch mounts to a standard UK electrical back box or DIN rail enclosure. The round dial shows a 24-hour cycle with numbered segments allowing on and off times to be set by positioning plastic pins around the dial edge. The day omit dial allows specific days of the week to be excluded from the schedule without removing pins, useful for skipping weekend operation in offices or shops.

The manual override button provides temporary control outside the programmed schedule — pressing it turns the load on or off until the dial advances to the next programmed event. A 100-hour battery reserve keeps the clock running during mains power cuts, preventing schedule drift when power is restored. The clear polycarbonate cover protects the dial mechanism while allowing visual confirmation of the current time position and programmed segments.

Product Specification Sheet

Product Manual

How is the on/off schedule programmed?

The dial has numbered segments representing 24 hours. Small plastic pins are positioned around the dial edge to mark when the load should switch on or off. The dial rotates once every 24 hours, triggering the switch as it passes each pin. The day omit dial allows certain days to be excluded without repositioning pins.

What does the early off function do?

The early off function allows the load to be switched off a set time before the programmed off event, useful for heating systems that retain heat after shutdown or processes that need a controlled run-down period before the scheduled stop time.

What happens during a power cut?

The 100-hour battery reserve keeps the clock mechanism running during mains power cuts, so the schedule remains accurate when power is restored. The battery does not power the load itself, only the timekeeping mechanism.

What is the maximum load rating?

The switch is rated at 20A on 230V mains, handling resistive loads up to 4,600W. For inductive loads such as motors or fluorescent ballasts, the effective rating is lower and should be confirmed against the datasheet for the specific load type.