24-Hour Timers | McMaster-Carr

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38 Products

Digital Timers


Style C	Style D	Style F	Style K

Style M	Style P	Style R	Style Y

Timers with Calibration Certificate Traceable to NIST Timers—Timers with a calibration certificate traceable to NIST have been tested to NIST standards to ensure accuracy.

Memory Function—Timers with a memory function automatically return the display to the last programmed time. Good for timing repetitive intervals.

IP65 Enclosure Rating—IP65-rated timers protect against dust and low-pressure washdowns. They also resist impacts up to 4 ft.

											Case
	Style	Timing Functions	Max. No. of Events	Max. Timer Duration, hr.	Max. Alarm Duration	Timer Resolution	Ht.	Wd.	Dia.	Dp.	Material	Color	Backing Type	Batteries Included	Features	Enclosure Rating		Each
Timers



		C	Count Up Count Down Pause Clock	1	24	Continuous	1 sec.	1 3/4"	—	3 1/8"	—	Plastic	White	—	Yes	Alarm Memory Function	—	00000000	000000


		D	Count Up Count Down Pause	1	24	12 sec.	1 sec.	2 1/2"	3 3/4"	—	1"	Plastic	Gray	Magnetic	Yes	Alarm Built-In Stand Memory Function	—	0000000	00000
		F	Count Up Count Down Pause Clock	1	24	1 min.	1/100 sec.	3 3/4"	3 3/4"	—	3"	Plastic	Gray	—	Yes	Alarm Built-In Stand Memory Function	—	000000	00000
		K	Count Up Count Down	2	24	1 min.	1 sec.	3 3/4"	5"	—	1/2"	Plastic	White	—	Yes	Alarm Memory Function	—	00000000	00000
		M	Count Up Count Down	1	24	5 min.	1 sec.	5 1/4"	7 3/4"	—	1"	Plastic	Black	—	Yes	Alarm Built-In Stand Memory Function	IP65	00000000	00000
		P	Count Up	4	24	Continuous	1 min.	5 1/2"	8 7/8"	—	1"	Plastic	White	Magnetic	Yes	Alarm Built-In Stand Clip Dry Eraseable	—	00000000	00000


		Timers with Calibration Certificate Traceable to NIST Timers



				R	Count Up Count Down Pause Clock	2	24	1 min.	1 sec.	2 1/8"	2 3/4"	—	7/8"	Plastic	Black	Magnetic	Yes	Alarm Built-In Stand Memory Function	—	0000000	00000


				Y	Count Up Count Down	1	24	1 min.	1 sec.	3 1/4"	2 1/2"	—	1/2"	Plastic	White	—	Yes	Alarm Built-In Stand Memory Function Repeat Function Voice Alerts	—	00000000	00000

High-Current Time and Day Activated Switches

Control equipment with high currents such as landscape lighting, pumps, and heaters. Program these switches to turn a device on and off at a set time and day. Position trippers around the clock dial to set on and off times.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily.

Day Skipper—Switches with a day skipper can be programmed to skip operation for one to six days.

Trippers—Additional trippers (sold separately) are sold in pairs that include one “on” tripper and one “off” tripper.

	Switches															Trippers
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time	Tripper Type	No. of Trippers	Switch Designation	Ht.	Wd.	Dp.	Wire Connection	Environment		Each	No. of Trippers Included		Pkg.
24-Hr. Timing Cycle



		1	20 amp @ 120V AC, 208V AC, 240V AC, 277V AC	120/208/240/277	48	15 min.	Captive	96	SPDT	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	0000000	—	———	0


		1	40 amp @ 240V AC	120	12	1 hr.	Removable	2	SPST	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	00000	1 Pair	0000000	00000
		2	40 amp @ 240V AC	120	12	1 hr.	Removable	2	DPST	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	00000	1 Pair	0000000	0000
		2	40 amp @ 240V AC	208/240/277	12	1 hr.	Removable	2	DPST	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	000000	1 Pair	0000000	0000


		24-Hr. Timing Cycle with Day Skipper and Three Skip Screws



				1	40 amp @ 240V AC	120	10	1 hr.	Removable	2	SPST	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	00000	1 Pair	0000000	0000


				2	40 amp @ 240V AC	120	10	1 hr.	Removable	2	DPST	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	000000	1 Pair	0000000	0000
				2	40 amp @ 240V AC	208/240/277	10	1 hr.	Removable	2	DPST	7 3/4"	5"	3"	Screw Terminal	Indoor Only	0000000	000000	1 Pair	0000000	0000

Screws

	Pkg. Qty.		Pkg.
Additional Day-Skip Screws	3	0000000	00000

Time and Day Activated Switches

24-Hr. Timing Cycle

Program these switches to turn a device on and off at a set time and day. They have a three-prong outlet to plug devices directly into the switch. Use with lamps and other small electrical loads. All have an override to bypass the programmed on/off settings.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily.

Timing-Adjustment Tripper—Switches with trippers are programmed by setting on and off times by positioning trippers around the clock dial.

												Electrical
	Switching Current @ Voltage	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Tripper Type	No. of Trippers	With Override	No. of Outlets	Ht.	Wd.	Dp.	Connection	No. of Blades	Certification		Each
24-Hr. Timing Cycle



		15 amp @ 120V AC	3	30	Tripper	Removable	6	Yes	1	3 1/4"	3 1/4"	3 1/4"	Straight Blade	3	CSA-US Certified, CSA Certified	0000000	000000

Surface/DIN-Rail Mount Time and Day Activated Switches

Mount these switches to a flat surface or attach to DIN rail. Program them to turn a device on and off at a set time and day. Position trippers around the clock dial to set on and off times. These switches have a 24-hr. timing cycle that repeats the same program daily. As UL and C-UL Recognized Components that are also CSA Certified and CE Marked, they meet American, Canadian, and European safety standards.

												Mounting
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Tripper Type	Switch Designation	Ht.	Wd.	Dp.	Fasteners Included	No. of Holes	Hole Dia.	For DIN Rail Ht., mm	Wire Connection	Certification		Each
24-Hr. Timing Cycle



		1	21 amp @ 250V AC	120	48	15	Tripper	Captive	SPDT	4.2"	2.8"	2.2"	No	3	0.13"	35	Screw Terminal	UL Recognized Component, C-UL Recognized Component, CSA Certified, CE Marked	0000000	000000

Outdoor High-Current Time and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing. They control equipment with high currents, such as landscape lighting, pumps, and heaters. Program them to turn a device on and off at a set time and day. Position trippers around the clock dial to set on and off times.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily.

Day Skipper—Switches with a day skipper can be programmed to skip operation for one to six days.

Trippers—Additional trippers (sold separately) are sold in pairs that include one “on” tripper and one “off” tripper.

	Switches															Trippers
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time	Tripper Type	No. of Trippers	Housing Material	Switch Designation	Ht.	Wd.	Dp.	Wire Connection		Each	No. of Trippers Included		Pkg.
24-Hr. Timing Cycle



		1	40 amp @ 240V AC	120	12	1 hr.	Removable	2	Steel	SPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminal	0000000	0000000	1 Pair	0000000	00000


		2	40 amp @ 240V AC	120/208/240/277	48	15 min.	Captive	96	Polycarbonate	DPDT	8 7/8"	6 5/8"	3"	Screw Terminal	0000000	00000	—	———	0
		2	40 amp @ 240V AC	120	12	1 hr.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminal	0000000	000000	1 Pair	0000000	0000
		2	40 amp @ 240V AC	208/240/277	12	1 hr.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminal	0000000	000000	1 Pair	0000000	0000


		24-Hr. Timing Cycle with Day Skipper and Three Skip Screws



				2	40 amp @ 240V AC	120	10	1 hr.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminal	0000000	000000	1 Pair	0000000	0000


				2	40 amp @ 240V AC	208/240/277	10	1 hr.	Removable	2	Steel	DPST	9 3/8"	5 1/2"	3 5/8"	Screw Terminal	0000000	000000	1 Pair	0000000	0000

Screws

	Pkg. Qty.		Pkg.
Additional Day-Skip Screws	3	0000000	00000

Stopwatches


Style C	Style F	Style G

Quickly view starts and finishes on a digital screen.

Stopwatches with Calibration Certificate Traceable to NIST—Stopwatches with a calibration certificate traceable to NIST have been tested to NIST standards to ensure accuracy.

Backlit Display—Use stopwatches with a backlit display to time events in low-light conditions.

					Case
	Style	Timing Functions	Max. Timer Duration, hr.	Accuracy	Material	Color	Lens Material	Water Resistance	Batteries Included	Features	Includes		Each
Stopwatches



		C	Count Up, Split, Clock	24	±0.125 sec./1 hr.	Plastic	Green	Plastic	Water Resistant	Yes	Alarm, Backlit Display	Lanyard	0000000	000000


		Stopwatches with Calibration Certificate Traceable to NIST



				F	Count Up, Split, Lap, Pause, Clock	24	±0.04 sec./1 hr.	Plastic	Black	Plastic	Water Resistant	Yes	Alarm	Lanyard	0000000	00000


				G	Count Up, Split, Pause, Clock	24	±0.4 sec./1 hr.	Plastic	Yellow	Plastic	Water Resistant	Yes	Alarm	Lanyard	0000000	00000

Outlet-Box-Mount Time and Day Activated Switches

24-Hr.

Timing

Cycle

Switches fit 1 gang outlet boxes. Program them to turn a device on and off at a set time and day. They’re often used with lamps and other small electrical loads.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily. Position trippers around the clock dial to set on and off times.

	Switching Current @ Voltage	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Tripper Type	Switch Designation	For Outlet Box Designation	Wire Connection	Wire Lead Lg.	Certification		Each
24-Hr. Timing Cycle—With On/Off/Timer Selector



	1	20 amp @ 120V AC	24	30	Tripper	Captive	SPST	1 Gang	Wire Leads	6"	UL Listed, C-UL Listed	000000	000000

Set-to-the-Minute High-Current Time and Day Activated Switches

For precise control of high-current equipment such as landscape lighting, pumps, and heaters, these switches schedule on/off times to the exact minute. A backup battery or capacitor maintains the program during a power outage.

2 Circuits Controlled—Two-circuit switches can apply a different program to each circuit.

												Mounting
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Housing Material	Switch Designation	Ht.	Wd.	Dp.	Fasteners Included	Hole Dia.	Knockout Trade Size	Wire Connection	Environment	Certification		Each
24-Hr. Timing Cycle—With Capacitor Backup, Lockout



		1	30 amp @ 240V AC	120/208/240/277	48	1	Push Button	Steel	SPST	7 7/8"	5 1/8"	3 7/16"	No	3/16"	1/2, 3/4	Screw Terminal	Indoor Only	UL Listed, CSA Certified	0000000	0000000


		2	30 amp @ 240V AC	120/208/240/277	48	1	Push Button	Steel	SPST, DPST	7 7/8"	5 1/8"	3 7/16"	No	3/16"	1/2, 3/4	Screw Terminal	Indoor Only	UL Listed, CSA Certified	0000000	000000

Panel-Mount Time and Day Activated Switches

Install these switches in a panel cutout and program them to turn a device on and off at a set time and day. Position trippers around the clock dial to set on and off times. As UL and C-UL Recognized Components that are also CE Marked, these switches meet American, Canadian, and European safety standards.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily.

												For Panel Cutout
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Tripper Type	Switch Designation	Ht.	Wd.	Dp.	Ht.	Wd.	Wire Connection	Certification		Each
24-Hr. Timing Cycle



		1	21 amp @ 250V AC	120	48	15	Tripper	Captive	SPDT	2.8"	2.8"	1.5"	2.63"	2.63"	Quick-Disconnect Terminal	UL Recognized Component, C-UL Recognized Component, CSA Certified, CE Marked	0000000	000000

Outdoor Time and Day Activated Switches

24-Hr. Timing Cycle

Designed to work with landscape lighting and filter pumps, these switches turn equipment on and off at a set time and day. They control two devices at once, and have three-prong outlets to plug devices directly into the switch. All have an override to bypass the programmed on/off settings.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily. Position trippers around the clock dial to set on and off times.

NEMA 3R Enclosure Rating—NEMA 3R rated switches are protected against falling liquids and light splashing.

Light Sensor Control—Switches with light sensor control allow one device to be controlled by the presence or absence of light.

												Electrical			Mounting
	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Tripper Type	No. of Trippers	Switching Current @ Voltage	No. of Outlets	Features	Ht.	Wd.	Dp.	Connection	No. of Blades	Cord Lg., ft.	Fasteners Included	No. of Holes	Hole Dia.		Each
24-Hr. Timing Cycle—NEMA 3R



		12	30	Tripper	Removable	4	15 amp @ 120V AC	2	Light Sensor Control	9 3/8"	5 1/2"	3 3/8"	Straight Blade	3	2	No	4	1/4"	0000000	0000000

Trippers

		Pkg.
Additional Trippers (Pkg. of 2 Pairs)	0000000	00000

Outdoor Set-to-the-Minute High-Current Time and Day Activated Switches

Rated NEMA 3R, these rain-tight switches protect against falling liquids and light splashing. More precise than other time and day switches, they program on/off times for equipment down to the exact minute. They control equipment with high currents, such as landscape lighting, pumps, and heaters. A backup battery maintains the program during a power outage.

24-Hr. Timing Cycle—24-hr. switches repeat the same program daily.

												Mounting
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	Housing Material	Switch Designation	Ht.	Wd.	Dp.	Fasteners Included	Hole Dia.	Knockout Trade Size	Wire Connection	Environment	Certification		Each
24-Hr. Timing Cycle—With Battery Backup, Lockout



		1	30 amp @ 240V AC	120/208/240/277	20	1	Push Button	Polycarbonate	SPST	8 3/8"	5"	3 1/8"	No	0.26"	1/2, 3/4	Screw Terminal	Outdoor, Wet	UL Listed	0000000	0000000


		2	30 amp @ 240V AC	120/208/240/277	20	1	Push Button	Polycarbonate	DPST	8 3/8"	5"	3 1/8"	No	0.26"	1/2, 3/4	Screw Terminal	Outdoor, Wet	UL Listed	0000000	000000

Surface/DIN-Rail Mount Set-to-the-Minute Time and Day Activated Switches

24-Hr. Timing Cycle

Mount these switches to a flat surface or attach to DIN rail. More precise than other time and day switches, they program on/off times for equipment down to the exact minute. All have an override to bypass the programmed on/off settings. A backup battery maintains the program during a power outage.

24-Hr. Timing Cycle—24-hour switches repeat the same program daily. They control two circuits and can apply a different program to each circuit.

												Mounting			For Panel Cutout
	No. of Circuits Controlled	Switching Current @ Voltage	Input Voltage, V AC	Max. On/Off Cycles, per day	Min. Set Time, min.	Timing Adjustment Style	With Override	Switch Designation	Ht.	Wd.	Dp.	Fasteners Included	No. of Holes	For DIN Rail Ht., mm	Ht.	Wd.	Wire Connection	Certification		Each
24-Hr. Timing Cycle—With Battery Backup



		2	15 amp @ 250V AC	120/240	12	1	Push Button	Yes	SPST-NO	3.8"	3.8"	2.2"	No	2	35	3.62"	3.62"	Screw Terminal	UL Recognized Component, CSA Certified	00000000	0000000