Elkay Columbus Single contact Pneumatic Timer | 400A The Elkay Columbus pneumatic timer is an easy to fit and cost-effective way of automatically turning lighting off after a set period of time. Pushing the button switches the contacts and activates the time delay, which can be set at installation anywhere between 5 seconds and 5 minutes (Note timings are approximate). Applications The unit has single or double contacts as standard and can be fitted to existing single gang switches, making it a perfect low-cost energy saving solution in areas such as stairways, corridors, and storerooms. Features For LED, Fluorescent (6 fittings max) and incandescent lighting Available in white finish No neutral required. Replaces existing single gang wall switch. 5 seconds to 5 minutes adjustable activation