Delayed auxiliary relays are used in sequential control schemes requiring either a time-delay on pick-up (energisation: the output contacts change position at the end of the preset time initiated by the closure of a control contact external to the relay), or a time-delay on drop-off (de-energisation: the same operations occurs at the end of the preset time initiated by the opening of a control contact external to the relay).
The rating and clearances used for the output contacts allow them to be used directly to control switching equipment.

	Device	Tecnology	ANSI	Description
	RAT 2002 RAT 3008 RAT 3044	DIGITAL	2	Delayed multifunction auxiliary relay
	TTT 7111 TTT 7112 TTT 7118 TTT 7121	STATIC	2	Time delay auxiliary relay in modular case R type