Question about Lutron ELECTRONICS MAW-600H-LA SMART DIMMER

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Our lutron three way dimmers leak when off. There appears to be about 8 volts still going to the fixtures. That causes the transformers on the fixtures to sing when off. Probably not good for transformer life & very annoying. thoughts? Mike Parker

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If each fixture has an individual transformer, the chace is that they are electronic (about the size of a matchbox car) If so, you have the wrong dimmer installed. You will need to install a MAELV (Electronic Low Voltage) Dimmer. The regular dimmers are set up for Magnetic Low Voltage and incandescent which work differently. http://www.lutron.com/TechnicalDocumentLibrary/362219.pdf

Here is a link to the difference in how they work. Also, if they are a Low Wattage light like an LED, the dimmer may not have enough resistance to bleed off the excess voltage. The MAW-600 has a minimum load of either 25 or 40 watts. If you are operating LED's you may also need a Low Wattage Interface to act as a simulated load that wires in series with your lights. (lut-lbx)

If it gets too anoying until you get the proper dimmer, you can switch the Air Gap switch at the bottom to the off position. This completely disconnects the power to the load side of the dimmer.

Good Luck

Posted on Oct 13, 2010

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I agree with mikeb's assessment that they're probably electronic low-voltage. The additional benefit of the ELV dimmers (in this case - as most people don't see this as a benefit) is that the dimmer contains a neutral connection. That neutral connection will dump that leakage current back to the breaker without feeding it to the load.

Posted on Oct 13, 2010

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1 Answer

Why does leds hesitate coming on with lutron dimmer


Often led s hesitate even with single pole switch. It's probably not the dimmer. Led s get powered from a transformer inside the fixture and it just takes a second for them to get going. I've found its not consistant. The same two recessed lights have different start up times.

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We have a lutron nova 2003p (1600 watt) switch supplying power to a line of 18 12 volt, 50 watt lamps. switch went out. is this caused by over-amperage draw?


Hi John, I'm an electrician and I think I can help you with this problem.

First and foremost, this switch's 2000VA / 1600W electrical rating is based on a incandescent load.

Let's do do the math on this one.. 18 x 50 = 900 watts. So, you're under the 1600 watt capacity, but I think this is a bit more involved than this.

I'd be willing to bet that you're not dimming a 12 volt circuit - but rather a 120 volt circuit that supplies one or more transformers that step the power down from 120 volts to the the 12 volt bulb voltage. A transformer is an inductive load. A transformer's inductive load is completely different than the incandescent load the dimmer is designed to control. The transformers are rated for 120 volts and will have issues including heat problems if provided less than the rated input voltage to provide a reduced output voltage you want so that you can dim these lights.

This switch will not work on the output of the transformer in this situation either because the significant amperage being switched here. Each of these lamps draws a bit over 4 amps as determined by ohm's law: 50W / 12V = 4.16A. The total load at 12 volts is (again, Ohm's law) 18 x 4.16A = 74.88A ! That means the wire would need to be a #4 or #2. This is about the size of the cable on your car's battery (only amperage determines conductor size - voltage determines insulation).

A dimmer on this circuit will not work unless the fixtures are changed so that no transformers are used to supply the lamps. This includes fluorescent lamps (compact or otherwise) unless the packaging specifically states that they can be used on a dimmer.

You may wish to contact Lutron Hotline at 800-523-9466 for additional help and suggestions. I hope this helps & good luck!

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Removed the switch plate and connected the two wires going into the dimmer box and the lights still dont come on. I as thikning by bypassing the dimmer the lights should still function. What else could be...


I am going to stick my neck out a little with this one although I agree with BoomerP. The clue of halogen bulbs is feeding my answer. Halogen bulbs require a high voltage transformer to operate and won't normally work with a dimmer but I never tried it. Bypassing the switch should bring them on though. If you have the proper voltage at the switch and they don't work with the switch bypassed, its probably a bad transformer in the fixture. Good Luck. Be careful.

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I have a Maestro dimmer on 2 20 w hallogen bulbs and the dimmer when turn off or on dims the lights rapidlyup and down.


When you say "halogen bulbs," are you referring to MR-16 (12-Volt) lamps off a transformer, or line-voltage halogen lamps. If using the MR-16s, then the fixture doesn't qualify as "incandescent" which is what the dimmer you have is rated for, and the behavior of the transformers within the fixture can cause the types of issues you're seeing. If it is a line-voltage (120-volt) halogen then, then it could be a number of things depending upon how "rapidly" and frequent the "up and down" is. Regardless, call Lutron's tech support number at 1-800-523-9466. They're available 24/7, they won't charge you, and they can help you sort this out.

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Sounds like a loose connection. If they all fo out, it's at the beginning of the circuit. Check all connections at the start of circuit.

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This dimmer was not made to dim a load smaller than 40VA. That halogen bulb would only have been 20VA or so.

http://www.lutron.com/cms400/PageBuyNow.aspx?id=16977&mn=1815

I think that when your bulb burnt out, the dimmer over-volted the transformer and smoked it. That said, I think you have a fixture problem and, possibly, a switch problem, too.

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This dimmer was not made to dim a load smaller than 40VA. That halogen bulb would only have been 20VA or so.

http://www.lutron.com/cms400/PageBuyNow.aspx?id=16977&mn=1815

I think that when your bulb burnt out, the dimmer over-volted the transformer and smoked it. That said, I think you have a fixture problem and, possibly, a switch problem, too.

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