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Timers

There are many applications where a timer is important. HVAC equipment, freezers and even lighting in an industrial setting often needs to be placed on a timer so that it will turn on when required, and turn off when not needed. Timers help protect power supplies by eliminating unnecessary stops and starts of equipment, and they can also help lower energy use by turning off equipment automatically. Grainger offers timers for many different applications, so today's businesses can be energy conscious while still benefiting from their electrical equipment.

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Timers Q&A

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Timers
(11 Questions : 17 Answers)

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2 years, 1 month ago
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Answer: 
Technically, a timer with 1 pole can turn a 120v or 240v circuit on or off. The difference is in the 240v circuit; one leg of the circuit will be switched on and off while the other leg will remain hot to the device at all times. Safety, among other reasons, generally dictates that you use a switch with the appropriate number of poles.

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The source for the answers given by Grainger in Ask and Answer are based on the information provided with the question, which may not be complete or may not apply to other situations, and based on product literature and informational materials, the content of which is provided by Grainger’s product suppliers. Grainger disclaims liability for any information it provides in Ask and Answer which later may be alleged or determined by a court of law to be inaccurate or incorrect. The answers given by Grainger in Ask and Answer are not intended to replace or supplement any professional, engineering or other consultation services available to its product users. Always read, understand, and follow the product information and instructions provided by the manufacturer.
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Age: 35 to 44
2 years, 1 month ago
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Answer: 
You need a two pole for a 220 circuit
1 year, 8 months ago
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Answer: 
would have to have a neutral for single pole. 120 or 277, not 220.
need a 2-pole for that.
1 year, 7 months ago
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Do you carry an Astrological time clock?
1 year, 5 months ago
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Answer: 
Yes. Grainger stocks astronomic timers. There are many to choose from, but a couple of basic timers to begin looking at are Grainger item numbers 4JNF4, 2YMV9 and 4WZ09.

Please call us at 800-323-0620 so we can discuss your application and aid you in selecting the proper timer for your project.

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1 year, 5 months ago
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Answer: 
3FWZ4 is a wall-switch type timer. I'm not sure what you mean
by Astrological timer, but this one will automatically change times based on your geographical location. It tracks dawn-to-dusk times, which change with the season.
If that is what you meant, than this timer is a good one.
1 year, 5 months ago
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Answer: 
They have astronomic timeers that automatically adjust time of day for your longitude and latitude; they also adjust for DST...
Is that what you needed?
1 year, 4 months ago
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I have a light that is controlled by a spst switch. I would like to put it on a timer, but there is no means for powering a timer motor. I know that there are timers that mechanically throw an existing wall switch. Are there any other options, such as a timer that operates a SPST switch that is powered by an internal battery...?
1 year, 7 months ago
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Answer: 
Currently, all of our timers will require a hardwired power source. We have none that are battery-operated only.

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1 year, 7 months ago
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Answer: 
3FWZ4 should do the trick. 7-day timer, see the description online or in the catalog
1 year, 7 months ago
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when a timer indicates it has 2 channels; does this mean it can program 2 independent pumps with independent time schedules? I want to turn my pool filter pump on at a certain time schedule and my pool sweeper on at a different time schedule.
1 year, 6 months ago
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Anonymous
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Answer: 
2-channels mean 2 relay outputs independantly programmed. Check the timers on pg 407 of catalog 403.
1 year, 6 months ago
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Answer: 
That is correct - it will run two appliances independently.
1 year, 3 months ago
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I need a timer for my typical pool motors that run on 240 VAC.
One is a filter pump, the other is a sweep pump.
It looks like I need a 2 pole switch with 2 "channels"; but not sure of the relevance of the contact type: SPST vs DPST
1 year, 7 months ago
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Anonymous
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Answer: 
SPST means single pole, single throw. This type has one contact pair, and can control one leg of a voltage source.

DPST means double pole single throw. This type has two contact pairs, and can control two legs of a voltage source.

In both, the contact pairs move on the same armature, opening and closing at the same time.

If both motors come on and off at the same time, a DPST could be used, as long as it is sized to handle the total HP, voltage, and amps of both the motors. You would also have to fuse the line side of the relay correctly, and overload protect the motors on the load side. Easiest way to do this is get a motor starter sized to handle both motors.
1 year, 6 months ago
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1 year, 4 months ago
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Answer: 
We need more information to get you to a specific part number. We need to answer questions like: does this timer need a reference to time of day? and what length of time?

Please call us at 800-323-0620 so we can discuss your timer needs in more detail.

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1 year, 4 months ago
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Previously we used a timer operated by 12v DC battery bank to switch the 120 v AC inverter output. Timers which we have inserted between the inverter and load do not keep proper time. It would seem that switching between the battery bank and inverter would require switching over 20 amps. Switching the 120 v AC inverter output 210 watts of only 2 amps. The inverter does not have sleep mode so we do not know why the clock portion of timer does not work. Is there a battery powered (Displqy and Switch) device which can switch the inverter ?
1 year, 2 months ago
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Answer: 
The 12VDC timers Grainger carries are item numbers 4CCC4, 4CCC2, AND 4CCC3. They are limited to 16A Resistive loads.

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1 year, 2 months ago
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11 months ago
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Answer: 
Please take a look at these basic timers to see it they will meet your needs.

3NZR6
2DBE9
3GZX5
14F313
14F316
9NLW2

We have a large selection and these are just a few options. Thank you for using Grainger.com Ask & Answer.
10 months ago
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I have a sailboat with an automatic bilge pump. When I come aboard, I want to see how many seconds the bilge pump ran when I was away. Display should be 5 digits or more. It needs a reset button to set it back to zero. My sailboat runs on 12 Volt DC. It would be nice if it was flush mounting LCD display that would use no electricity when it wasn't switched on by the bilge pump running. Maybe it could have a button that shows the reading when it isn't running, then lets it go dark when the button is released.
8 months ago
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Answer: 
Grainger does have a timer that should meet your needs. Please look at item number 13C868.

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7 months ago
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Hi

I'm looking for a wall plug timer that allows for more than 7 day intervals, like f.inst monthly or even arbitrarily number of days between power cycling

Can you point me to such a unit?
Br
Ole Bjerregaard
3 months, 2 weeks ago
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Answer: 
Grainger item numbers 6WPA0, 30C512, 30C513, 30C514, 6PFY4, 6PFY5 and 23YU35 all have a random feature to them, however, none have programing beyond 7 days.

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3 months, 1 week ago
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