Question about RTO 10-amp Relay Wall Switch

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Help me identify Relay Wall Switch

This is not about an RTO switch, but FixYa won't let you post without a product...

I have a relay wall switch or power relay that is working intermitently, and I would like to identify the switch and its power relay, so that I can replace it.

The house was built around 1990, so this was a switch that was available back then.

The Switch: The only marking on the switch is the notation ''I33B'' on the side of the switch, that is either ''133B'' or ''i33B''. The switch is a paddle form factor, looks like one of the Leviton Paddle switches. The switch seems to have control wires rather than load wires routed to it. Looking at the front of the switch there are two wires to the left side of the switch and one wire to the right side of the switch, not counting ground.

The Relay: The Relay that goes with the switch is in the electircal box of the light fixture. It looks like a small can, and protrudes out one of the round holes in the electrical box. I could not see any identifying mark on the relay, but it was hard to see.

Any clues on what sort of relay and relay switch I might have? The relay appears to have gone intermittent.

Any ide

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  • jchristy4 Jan 05, 2009

    Clarification: The Relay switches a 110V light circuit on and off. The Wall Switch associated with the relay has three wires, I did not see a load when I put a volt meter on the switch. The wires on the wall switch are thinner than normal 110V wires.

  • Tripp REa May 11, 2010

    I think you need to send a pic... sorry, but I can' t visualize what youre describing. If its a 110 v fixture and a 110 v electrical system it really shouldn't need a relay. Is the light controlled in more than one location? Is the 110 v switch a dimmer? who manufactures it?

  • Tripp REa May 11, 2010

    rather than focusing on what specific products you have can you describe more specifically what the system is accomplishing and I can suggest parts to make it work... for example, is the switch passing 110 to a relay that is then powering 12 or 24 volts for something like a duct vent or fan? If you describe what it is doing or better yet a diagram I can tell you what parts to buy now...



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Good Morning
First - I am not a certified electrician but in my 78 years young of dealing with electrical problems sounds like you have three way switch similar to a light switch used on one end of a hallway or bottom of the stairwell with another switch located at the top.
Why they used a 10 amp switch issomething I can't explain other than was the only switch of that STYLE or CLASS.
The relay looks like a relay we used to use in the hospital to control lights from a patientscontrol cnter at the head of the bed and that I believ was manufactured by GE only theose were either 12 or 24 volt coil. the GE had different styles ro circuits.
Have a good Day

Posted on Jan 05, 2009


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