Solid-State Timers | McMaster-Carr

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52 Products

Solid State Surface-Mount Timer Relays

Attach these relays to a flat surface using the mounting hole. They have no moving parts, so compared to mechanical switches, they require less maintenance, last longer, and are quieter.

Delayed Start (Delay on Make)—Delayed start (delay on make) relays allow you to set how long it takes for the relay to turn on after input voltage is applied. For example, a drill starts pumping a lubricant immediately, but it does not start rotating until the set time has elapsed.

Delayed Switch Off (Delay on Break)—Delayed switch off (delay on break) relays activate with a switch instead of input voltage. When the switch is turned off, the relay remains on for a programmed amount of time before turning off. For example, a projector’s light is turned off with a switch, but its cooling fan continues to run for a set time.

Interval—Interval relays use input voltage to turn on for a programmed amount of time. For example, when a part moving down a conveyor reaches a certain location, a cleaning spray comes on for a set time.

Repeat Cycle—Repeat cycle relays turn on for a duration, then off for the same duration. They alternate between the two cycles until input voltage is removed. A common example would be a flashing light.

Switch on (Single Shot)—Switch on (single shot) relays require a switch to activate the relay. They’ll stay on for a programmed amount of time. For example, lights in a storage room are turned on with a switch and stay on for a set time before turning off.

Potentiometer—Switches with a potentiometer (variable switch) allow you to adjust the delay within the range.

				Timing Range
	No. of Terminals	Input Voltage	Control Current, mA	No. of	Overall, sec.	Switching Current @ Voltage	Ht.	Wd.	Dp.	Features		Each
Delayed Start (Delay on Make)







				1 Circuit Controlled with 1 Off—SPST-NO

				2	12V AC, 12V DC	21	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K731	0000000


				2	12V AC, 12V DC	21	1	0.25 to 5	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K732	000000
				2	12V AC, 12V DC	21	1	0.5 to 10	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K733	000000
				2	12V AC, 12V DC	21	1	3 to 60	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K734	000000
				2	12V AC, 12V DC	21	1	15 to 300	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K735	000000
				2	12V AC, 12V DC	21	1	30 to 10	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K736	000000
				2	24V AC, 24V DC	10	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K751	000000
				2	24V AC, 24V DC	10	1	0.25 to 5	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K752	000000
				2	24V AC, 24V DC	10	1	0.5 to 10	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K753	000000
				2	24V AC, 24V DC	10	1	3 to 60	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K754	000000
				2	24V AC, 24V DC	10	1	15 to 300	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K755	000000


				2	24V AC, 24V DC	10	1	30 to 10	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K756	000000
				2	120V AC, 120V DC	4	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K25	000000
				2	120V AC, 120V DC	4	1	0.25 to 5	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K26	000000
				2	120V AC, 120V DC	4	1	0.5 to 10	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K27	000000
				2	120V AC, 120V DC	4	1	3 to 60	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K28	000000
				2	120V AC, 120V DC	4	1	15 to 300	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K29	000000
				2	120V AC, 120V DC	4	1	30 to 10	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K31	000000
				2	24V AC to 240V AC/24V DC to 240V DC	10	1	1 to 1,023	1 amp @ 120V AC	2"	2"	0.89"	Potentiometer	77055K74	000000




						1 Circuit Controlled with 1 Off or 1 On—SPDT

						5	120V AC	29	1	0.05 to 1	8 amp @ 240V AC	2"	2"	0.9"	—	77055K45	000000


						5	120V AC	29	1	0.25 to 5	8 amp @ 240V AC	2"	2"	0.9"	—	77055K46	000000
						5	120V AC	29	1	0.5 to 10	8 amp @ 240V AC	2"	2"	0.9"	—	77055K47	000000
						5	120V AC	29	1	3 to 60	8 amp @ 240V AC	2"	2"	0.9"	—	77055K48	000000
						5	120V AC	29	1	15 to 300	8 amp @ 240V AC	2"	2"	0.9"	—	77055K49	000000
						5	120V AC	29	1	30 to 10	8 amp @ 240V AC	2"	2"	0.9"	—	77055K51	000000
						5	12V DC	292	1	3 to 60	8 amp @ 240V AC	2"	2"	0.9"	—	77055K631	000000
						5	12V DC	292	1	15 to 300	8 amp @ 240V AC	2"	2"	0.9"	—	77055K632	000000


						Delayed Switch Off (Delay on Break)







										1 Circuit Controlled with 1 Off—SPST-NO

										5	120V AC	36	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K33	00000


										5	120V AC	36	1	0.25 to 5	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K34	00000
5										120V AC	36	1	0.5 to 10	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K35	00000
5	120V AC									36	1	3 to 60	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K36	00000
5	120V AC									36	1	15 to 300	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K37	00000
5	120V AC									36	1	30 to 10	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K38	00000
7	12V DC									217	1	0.25 to 5	1 amp @ 120V AC	2"	2"	0.88"	—	7457K522	00000
7	12V DC	217								1	3 to 60	1 amp @ 120V AC	2"	2"	0.88"	—	7457K524	00000


Interval







										1 Circuit Controlled with 1 Off—SPST-NO

										5	120V AC	25	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.88"	—	7457K651	000000


										5	120V AC	25	1	3 to 60	1 amp @ 120V AC	2"	2"	0.88"	—	7457K654	000000
										5	120V AC	25	1	30 to 10	1 amp @ 120V AC	2"	2"	0.88"	—	7457K656	000000


										Repeat Cycle







														1 Circuit Controlled with 1 Off—SPST-NO

				7										120V AC	36	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.88"	—	7457K661	000000


				7	120V AC									36	1	3 to 60	1 amp @ 120V AC	2"	2"	0.88"	—	7457K664	000000
				7	120V AC									36	1	30 to 10	1 amp @ 120V AC	2"	2"	0.88"	—	7457K666	000000


				Switch on (Single Shot)







																1 Circuit Controlled with 1 Off—SPST-NO

																5	120V AC	36	1	0.05 to 1	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K641	000000


						5	120V AC									36	1	0.25 to 5	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K642	000000
						5	120V AC									36	1	0.5 to 10	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K643	000000
						5	120V AC									36	1	3 to 60	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K644	000000
						5	120V AC	36								1	15 to 300	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K645	000000
						5	120V AC	36	1							30 to 10	1 amp @ 120V AC	2"	2"	0.88"	Potentiometer	7457K646	000000
						7	12V DC	217	1							0.25 to 5	1 amp @ 120V AC	2"	2"	0.88"	—	7457K512	00000
						7	12V DC	217	1							0.5 to 10	1 amp @ 120V AC	2"	2"	0.88"	—	7457K513	00000
						7	12V DC	217	1							3 to 60	1 amp @ 120V AC	2"	2"	0.88"	—	7457K514	00000

Solid State DIN-Rail Mount Timer Relays

Mount these timer relays directly to 35 mm DIN rail (also known as DIN 3 rail) for fast installation. Unlike mechanical relays, they have no moving parts, so they require less maintenance and last longer, are quieter, and switch faster. After selecting a timing range, use the knob to adjust the trip time within the timing range.

				Timing Range
	No. of Terminals	Input Voltage	Control Current, mA	No. of	Overall	Switching Current @ Voltage	Max. Switching Voltage, V AC	Ht.	Wd.	Dp.		Each
Delayed Start (Delay on Make)







				1 Circuit Controlled with 1 Off—SPST-NO

				6	24V AC, 48V AC, 120V AC, 240V AC, 24V DC, 48V DC, 60V DC, 120V DC, 240V DC	7	7	0.1 sec. to 100 hr.	0.7 amp @ 240V AC	250	3 1/2"	0.7"	2.7"	7801K51	000000


				Interval







								1 Circuit Controlled with 1 Off—SPST-NO

								6	24V AC, 48V AC, 120V AC, 240V AC	7	7	0.1 sec. to 100 hr.	0.7 amp @ 240V AC	250	3 1/2"	0.7"	2.7"	7801K52	00000