A 30-Amp Twist-lock Meltdown!

Why do they fail? And is there a better solution?

I just answered this on the RV Lifestyle Group…

Hey Beth,

You need to replace both sides of the connector as otheres have already noted. You can get a replacement kit on Amazon for around $30 HERE.

I’ve been doing formal tests of L5-30 and TT-30 connector meltdowns, and the primary reasons for failure seem to be oxidation of the contacts, as well as not twist-locking the plug and using the locking ring.

The RV 30-amp twist lock connector was not originally designed for use outside on a vertical surface. It was a Hubble connector used for overhead power connections of portable equipment in factories. The locking ring provides extra support to help eliminate the connector flexing from the weight of the cord which reduces the contact area, as well as reduce rain from getting inside and oxidizing the contacts.

I’ve taught seminars on RV hookups many times and usually find a few RV owners who didn’t know that you needed to twist the plug to lock it in place, or who don’t bother using the locking ring. Both will cause connector meltdown at relatively low currents.

I also recommend the seasonal use of a good contact cleaner to remove oxidation. DeoxIT D5 is the best I’ve ever used.

Here’s a better answer from that same thread

Where to buy SmartPlugs (and lots of other RV stuff).

I’ve recently started an affiliate program with TechnoRV which does pay me a small commission on products that you purchase from them. I’ve know Eric and Tami for years, and their customer service and educational programs are fantastic. That’s something you don’t get from Amazon or eBay (as much as I like both of them). So click the TechnoRV logo above and take a look around. Many of their products were independently reviewed by me before they became dealers for them. For a direct link click HERE.

FYI: I did a 50,000 cycle insertion test with 30 and 50-amp SmartPlugs in my FunkWorks Lab last year, and they were still working perfectly.

Wait, there’s MORE!

Read my previous article on why 30-amp Twist-Lock plugs melt down HERE.

Let’s play safe out there… Mike