Robertson 3P20132 Fluorescent Ballast for 2 F40T12 Linear Lamps

Magnus: TLDR? Jump to the last paragraph.

Be aware that the two wiring diagrams on the product page are misleading. The first shows an 8-wire connection (lamps in series) and the second shows a 10-wire connection (lamps in parallel). This implied to me that either wiring is acceptable. However, the manufacturer's response to my question about what to do with the brown wires in an 8-wire connection only discusses the 10-wire connection. That means the 8-wire connection is not possible, and apparently the 8-wire diagram is intended only to show how an existing 8-wire connection must be changed to a 10-wire connection, thus you must separate the existing serial connection in the yellow wires. That SHOULD be clearly stated in the diagrams.

In my case that change would be EXTREMELY difficult, because there is only one pair of yellow wires going to that end of the fixture. The yellow wire series connection between the two lamps on that end is hidden behind a small panel that is not removable without removing the connectors that the lamps spin into. All of that is hard if you leave the fixture mounted overhead, and even if you do it (overhead or not) separating that series...

United States on Sep 29, 2023

Johanna: Was able to give my stoplight another life!! I read previous reviews because wires are a little different than old ones. Perfect!!!

United States on Sep 26, 2023

Matt: This ballast was straightforward to install and works great! In fact, when I installed this I also installed a complete LED troffer in the same drop ceiling, and the fluorescent fixture with this new ballast, on the same circuit, comes on faster than the LED fixture. The cost of this ballast is very reasonable and I would purchase this item again.

United States on Sep 23, 2023

Buster: good product

United States on Jun 30, 2023

Roger C: Rewiring is required so have extra wire nuts available and a new mounting hole and hardware is also required. Otherwise it works fine.

United States on Jun 23, 2023

Dr. Wood: The ballast on my DynaTrap XL died and you can't got the original one as they want you to just buy a new unit. I looked around for something similar. This one was slight overkill for the job and quite a bit larger than the original but it for inside the housing fine and the tubes fire up instantly.

Canada on May 14, 2023

AC PAPA: It worked after I figured how to wire it but it wasn’t the one I ordered. I have 8 wires and this one has 10 wires

Canada on Aug 30, 2020

Bob Intengan: Good price and prompt delivery on both orders, first order already installed and working well. Second order not yet installed so cannot tell if ballast if good.

Canada on Sep 18, 2015

BB in SJNB: Perfect. Price,install and operation.

Canada on May 19, 2015

Amazon Customer: Worked like a charm to replace my old dead 80s-era ballast, even with the same wiring. More than enough wire was provided on the harness. Huge improvement over the old ballast, much faster startup time.

Canada on Feb 04, 2015