The Manuflex AB4 series timer is a manually set, synchronous motor driven timer, adjustable to a selected time range by a large, easy to read set pointer. To operate, turn the set pointer to the required time interval. A load circuit is closed when the pointer is turned from zero. The timer motor drives the pointer back to zero, at which point the load circuit opens. This timer is used where a device is to be turned on, runs for a selected time and stops at the end of the timer interval. The AB4 also has a hold position, enabling the load circuit to remain off or remain on without starting the timing motor.
The AB series also has a preset stop between hold and maximum time to prevent counter-clockwise pointer setting beyond hold. It also has an adjustable stop enabling operator to limit clockwise pointer setting to a predetermined time on the dial. Lifting of adjustable pointer limit sop lever raises pawls from gear teeth, allowing stop to be rotated to required position. Releasing limit stop lever engages pawls in gear teeth, locking lever in position. Sop lever may be adjusted during the timing period.