Dual Timers | McMaster-Carr

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17 Products

Digital Timers


Style J	Style K	Style R	Style S

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.

Style S—Style S timers have an extra-loud alarm that can be heard over background noise in a typical manufacturing environment.

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

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



		J	Count Up Count Down Clock	2	3,000 day	15 sec.	1/100	2 7/8"	5"	7/8"	Plastic	Silver	—	Yes	Built-In Stand	3879T111	000000


		K	Count Up Count Down	2	24 hr.	1 min.	1	3 3/4"	5"	1/2"	Plastic	White	—	Yes	Alarm Memory Function	3879T114	00000


		Timers with Calibration Certificate Traceable to NIST Timers



				J	Count Up Count Down Clock	2	3,000 day	15 sec.	1/100	2 7/8"	5"	7/8"	Plastic	Silver	—	Yes	Built-In Stand	3879T116	00000


				R	Count Up Count Down Pause Clock	2	24 hr.	1 min.	1	2 1/8"	2 3/4"	7/8"	Plastic	Black	Magnetic	Yes	Alarm Built-In Stand Memory Function	6099T77	00000
				S	Count Up Count Down Pause	2	100 hr.	1 min.	1	3"	3 1/2"	5/8"	Plastic	White	Magnetic	Yes	Alarm Built-In Stand Memory Function	3516T46	00000

Dual-Channel DIN-Rail Mount Multifunction Timer Relays

Control two steps of an electrical process from a single relay—with two fully independent channels and 30 different functions, these relays give you a wide range of possibilities. Each channel has its own output, so you can run two different functions (one per circuit) at the same time. Mount them to 35 mm DIN rails (also known as DIN 3 rail) and connect them to lighting systems, conveyors, electric motors, and other systems. These relays are UL Listed, C-UL Listed, and CE Marked, meaning they meet U.S. and international safety standards.

View times, function names, and on/off status for both channels at once using the digital display. You can program these relays with a joystick on the face, which is easier to use than the rotary dials on traditional relays. You can also program them using an Android phone with NFC (near field communication) capability, which is commonly used for mobile payment. Once you select the functions you need, hold the phone against the relay to program.

Connect switches to inputs on these relays to trigger, pause, and reset functions. Turning on a switch connected to the pause input stops functions until the switch is turned off. A switch connected to the reset input will start functions from the beginning. If the relay is actively receiving a signal, the function will restart right away. If there is no signal, the function will stop and reset, so it starts from the beginning the next time it’s triggered. You can use switches to pause or reset both channels at once, or for one channel only.

Although these relays have 30 different functions, they all fall into 10 categories. Within these categories, you can select different functions to allow you to add a switch, program a delay, or change how the relay responds to a trigger (turning on or off, pausing, or resetting).

Delayed Start (Delay on Make) Timer—These functions 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 lubricant immediately, but it does not start rotating until the set time has elapsed.

Delayed Switch Off (Delay on Break) Timer—These functions use 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.

Delayed Switch-On with Delayed Switch-Off Timer—This function uses a switch instead of an input voltage. It allows you to set how long it takes the relay to turn on after a switch is turned on, and how long it will stay on after the switch is turned off. For example, a furnace turns on, but the fan doesn’t start pushing air through the vents until it has been heated. When the furnace turns off, the fan keeps blowing to circulate all the hot air.

Interval Timer—These functions use input voltage to turn on the relay 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 amount of time.

Switch on (Single Shot) Timer—These functions require a switch to activate the relay, which stays on for the 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.

Repeat-Cycle Timer—When input voltage is applied, the relay turns on for a duration, then off for the same duration. They alternate between the two until input voltage is removed. For example, a flashing light stays on and off for equal periods of time.

Asymmetrical-Repeat-Cycle Timer—These functions start with an on-cycle and then have an off-cycle, but these cycles have different durations. The cycles repeat until input voltage is removed. For example, a sprinkler system sprays in short bursts followed by longer rest periods, on and off until input voltage is removed.

Manual-Switch-Control Timer—Use these functions to turn the relay on and off with a switch.

Fixed On/Off Timer—The on function keeps the relay on whenever input voltage is applied; it will only turn off if the voltage is removed. The off function keeps the relay in an off state, even if input voltage is applied.

Switch-On Asymmetrical Repeat Cycle Timer—These functions require a switch to activate the timing function. The input voltage is applied the whole time, and when you turn the switch on, the relay begins with an on-cycle followed by an off-cycle. These cycles have different durations, and they repeat until you turn the switch off. They could be used to turn on a motor or other system for a short period and then turn it off for a longer rest period, repeating that pattern until the switch is turned off.

Proximity Sensor Compatability (PNP and NPN)—Use relays with proximity sensor compatibility to activate functions when your sensor is triggered, such as when an object approaches or a liquid level changes. These relays are compatible with both standard styles of sensors, PNP and NPN, and are often used for warning signals, motion-detecting light and heating systems, and automated assembly lines.

					Timing Range
	No. of Terminals	Input Voltage	Control Current, mA	Timer Relay Function	No. of	Overall	Switching Current @ Voltage	Max. Switching Voltage, V AC	Ht.	Wd.	Dp.	Features		Each
2 Circuits Controlled with 2 Off and 2 On—DPDT



		12	12V AC, 24V AC, 12V DC, 24V DC	8	Manual Switch Control Fixed On/Off Switch on (Single Shot) Delayed Start (Delay on Make) Delayed Switch Off (Delay on Break) Delayed Switch-On with Delayed Switch-Off Interval Repeat Cycle Asymmetrical Repeat Cycle Switch-On Asymmetrical Repeat Cycle	30	0.1 sec. to 9,999 hr.	16 amp @ 240V AC	240	3.4"	1.4"	2.2"	2 Individually Programmable Timers, LCD Screen, Proximity Sensor Compatability (PNP and NPN)	7105N11	0000000


		12	120V AC, 240V AC, 110V DC, 240V DC	16	Manual Switch Control Fixed On/Off Switch on (Single Shot) Delayed Start (Delay on Make) Delayed Switch Off (Delay on Break) Delayed Switch-On with Delayed Switch-Off Interval Repeat Cycle Asymmetrical Repeat Cycle Switch-On Asymmetrical Repeat Cycle	30	0.1 sec. to 9,999 hr.	16 amp @ 240V AC	240	3.4"	1.4"	2.2"	2 Individually Programmable Timers, LCD Screen	7105N12	000000

Stopwatches


Style A	Style D	Style E	Style H

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.

						Case
	Style	Timing Functions	Max. Timer Duration	Accuracy	Max. No. of Laps Stored	Material	Color	Lens Material	Water Resistance	Backing Type	Batteries Included	Features	Includes		Each
Stopwatches



		A	Count Up, Split, Lap	10 hr.	±0.04 sec./1 hr.	—	Plastic	Black	Plastic	Water Resistant	—	Yes	—	Lanyard	1314T15	000000


		D	Count Up, Count Down	100 min.	±0.08 sec./1 hr.	—	Plastic	White	Glass	None	Magnetic	Yes	Alarm	Lanyard	2504T15	00000
		E	Count Up, Split, Lap, Count Down, Clock	10 hr.	±0.2 sec./1 hr.	30	Plastic	Green	Plastic	None	—	Yes	Alarm, Thermometer, Humidity Indicator	Lanyard	2504T16	00000


		Stopwatches with Calibration Certificate Traceable to NIST



				H	Count Up, Split, Lap, Pause, Count Down	10 hr.	±0.04 sec./1 hr.	300	Plastic	Gray	Glass	Water Resistant	—	Yes	Alarm	Lanyard	2504T17	00000

Clipboards

		Each
Aluminum Clipboard for Style A (9" Wd. × 12 ½" Lg.)	12495T8	000000

Counters/Hour Meters

Keep track of time while counting events. Units have two displays: one that receives input from a sensor, encoder, or switch and another that counts hours.

				For Panel Cutout		Overall
	Resettable	Counting Direction	No. of Digits	Ht.	Wd.	Ht.	Wd.	Dp.	Input Voltage	Housing Material		Each
Press On







				Screw Terminals

				No	Up	7	1.9"	1.9"	2.2"	2.2"	1.5"	24V AC	Plastic	16655T141	0000000


				No	Up	7	1.9"	1.9"	2.2"	2.2"	1.5"	120V AC	Plastic	16655T142	000000
				No	Up	7	1.9"	1.9"	2.2"	2.2"	1.5"	12V DC to 24V DC	Plastic	16655T171	000000

Electrically Actuated Hour Meters with Output Relay

Display running time on a machine so you can schedule preventative maintenance. These counters have two displays. One display shows the total running time and cannot be reset; the other shows the time elapsed since the last maintenance and can be wired for remote reset.

Output Relay Current @ Input Voltage—The output relay turns on an indicator light and sends a signal to another device when the counter reaches a set point. The signal can start/stop a process or trigger an alarm.

						Overall
	Resettable	Counting Direction	No. of Digits	No. of Set Points	For Panel Cutout Dia.	Dp.	Dia.	Operating Voltage	Output Relay Current @ Input Voltage	Features	Enclosure Rating		Each
Press On







				Wire Lead Connection

				No	Up	6	1	2"	1.7"	2.3"	85V AC to 265V AC, 90V DC to 360V DC	0.2 amp @ 265V AC, 0.2 amp @ 40V DC	Set Point Indicator Light	IP67	17045T72	0000000


				No	Up	6	1	2"	1.7"	2.3"	10V DC to 40V DC	0.2 amp @ 265V AC, 0.2 amp @ 40V DC	Set Point Indicator Light	IP67	17045T71	000000