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Curt Soft Trac I Trailer Breakaway Kit with Battery Charger

Curt Soft Trac I Trailer Breakaway Kit with Battery Charger

Item # C52040
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Trailer Breakaway Kit
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This breakaway kit with battery charger activates your trailer's electric brakes if the trailer disconnects from your vehicle. Side-loading case bolts onto your trailer's frame. Designed for trailers with up to 3 axles. Battery included. Lowest Prices for the best trailer breakaway kit from Curt. Curt Soft Trac I Trailer Breakaway Kit with Battery Charger part number C52040 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (16)
  • Q & A (5)
  • Videos (2)
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  • Why etrailer?

Curt Trailer Breakaway Kit - C52040

  • Kit with Charger
  • Curt
  • Side Load

This breakaway kit with battery charger activates your trailer's electric brakes if the trailer disconnects from your vehicle. Side-loading case bolts onto your trailer's frame. Designed for trailers with up to 3 axles. Battery included.


  • Breakaway system activates your trailer's electric brakes if the trailer disconnects from the tow vehicle
  • Battery charger ensures the system's battery is always charged
  • Side-loading case is easy to access from the side
    • Bolts onto trailer frame with included hardware
    • Can also be mounted to a round trailer jack using the included U-bolts
  • Lockable lid deters theft
    • Fastens using 4 included screws
    • Locks using a padlock (sold separately)
  • Weather-resistant polyethylene case protects the battery and charger from moisture and debris
  • Breakaway switch installs on your trailer's frame - drilling is required
  • Department of Transportation (DOT) compliant
  • 12V sealed lead-acid battery is included


  • Application: 1 to 3 axle trailers with electric brakes
  • Case dimensions: 5" long x 3-3/4" wide x 3-3/8" tall
  • Mounting hole spacing (center-to-center);
    • Left to right: 3"
    • Top to bottom: 4-1/2"
  • Battery capacity: 5 amp-hours
  • Battery dimensions: 3-1/2" long x 2-3/4" wide x 4" tall
  • 1-Year limited warranty

Note: A breakaway system is required by law in most states for trailers that are equipped with electric brakes and have a GTW of at least 3,000 lbs.

52040 Curt Soft Track 1 Break Away System with Battery Charger and Lockable Box

Installation Details C52040 Installation instructions

California residents: click here

Video of Curt Soft Trac I Trailer Breakaway Kit with Battery Charger

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Curt Trailer Breakaway Kit - Breakaway Kit - C52040

Hi there. I'm Michael with etrailer.com. Today, we're gonna take a quick look at the CURT Soft-Trac 1 Trailer Breakaway Kit. This breakaway system is going to activate your trailer's electric brakes. If the trailer we're to ever become disconnected from your tow vehicle, that's going to allow the trailer to slow and stop itself rather than allowing it to barrel down the road, potentially causing harm or injury to yourself or others. And now, the breakaway system is gonna be required by law in almost all the states for trailers that have a Gross Towing Weight of at least 3,000 pounds and that are equipped with electric brakes.

This system is designed for trailers that have one to three actuals and electric brakes. This does include an onboard 12-volt sealed lead-acid battery as well as a charger. That's going to help provide that power to apply the brakes if the trailer is disconnected from the tow vehicle's power. The battery does have a five-amp hour capacity. But with that built-in charger, that's going to help maintain the battery's charge while you're connected to your tow vehicle so that it is always gonna be ready when needed.

The breakaway switch itself is going to install onto your trailer's frame. You will then hook up the cable to your tow vehicle so if something we're to ever happen and the two we're to come apart, that breakaway switch is gonna be pulled out. That's going to allow power to flow from your battery down. It's going to then make that connection and that your black wire will then run to your brakes so that they will apply themselves to make sure that the trailer is going to slow and stop. The battery and the charger are going to be encased in this weather-resistant, polyethylene case so that they're gonna be protected from moisture and debris.

This case will bolt right onto your trailer frame with the included hardware. Or you can also mount it onto your round trailer jack using the included U-bolts that are included with the kit so that you can, rather than having to drill through the steel of your trailer frame, that will be a much easier option for you. As far as our dimensions, our case is right about five inches long by, depending on where we're measuring, up to the top here, let's say it's, well, close to about 5 1/2 inches tall and at about 3 1/2 inches thick. Our mounting holes are going to be, are at three inches from left to right and trying to make sure I get it lined up with the hole itself. Let's say it's about 4 1/2 inches from top to bottom.

The case is going to have a side-loading capability, so it's gonna be very easy to access from the side. The lid is gonna be fastened down with the four included screws. But you can also add a padlock here if you want to ensure extra security so that no one can come along, take away your battery or the charger in there. So several different options as to mounting this. For your breakaway switch, it is gonna need to be drilled into your trailer's frame, so make sure that it's got a nice solid connection. You will just need one screw to, or bolt and nut to get that installed. That's not included in this kit, but very simple to wire up. The wires coming from your battery and charger, you're gonna have a blue, red, and white. That blue is going to connect to the blue wire on your breakaway switch so that if you we're to become disconnected from your trailer, the power's gonna flow from your battery to your breakaway switch. Once that is pulled, that will allow the charge to flow then from your switch down to your brakes. So your black wire from your breakaway switch is going to connect to your brake wire. Your red, it's going to connect to your battery power coming from your tow vehicle so that you can trickle-charge your battery. And then your white is gonna be ground. So very simple to get hooked up to your system. This does meet Department of Transportation standard, so it is gonna be compliant with the DOT requirements. So if you are needing to add a breakaway system to your trailer, this is gonna be a great option for you to always ensure that you're gonna have that breaking capability if, for unfortunate cases where your trailer becomes disconnected from your tow vehicle. That's gonna complete our look for today. Again, I'm Michael with etrailer.com. Thanks for watching..

Customer Reviews

Curt Soft Trac I Trailer Breakaway Kit with Battery Charger - C52040

Average Customer Rating:  4.9 out of 5 stars   (16 Customer Reviews)

This breakaway kit with battery charger activates your trailer's electric brakes if the trailer disconnects from your vehicle. Side-loading case bolts onto your trailer's frame. Designed for trailers with up to 3 axles. Battery included.

- C52040

The u-bolts worked great for mounting the battery box on an electric tongue jack. I ended up heat shrinking the leads coming out and then siliconed the hole so no water could get in. I was not able to fully test the break away switch and stop the trailer with the battery but feel confident in the product.

- C52040

Easy to install.

Easy hookup and still working great after a year of use.
David F - 04/28/2021

- C52040

Good web site, good value, great instructional videos. Quick delivery! Wish it had a battery stus indicator. Only one that fit the jack.

Excellant. No problems.
Gordon & - 12/13/2020

- C52040

I also bought a new plug with attached junction box. The battery and charger were straight forward to wire. The only problem I had was that my old trailer wire colors did not match the new plug colors. Once I sorted out my wires everything worked well. I think it is a good battery kit

- C52040

This was easy to install adn I hope its not needed in the future!

Have only pulled it to test it, but I do that before every boating season, still working thus far, still have not had to use it in a emergency
Joseph - 05/28/2020

- C52040

- C52040


- C52040

Thank you Carol, the product was received today per the second order in excellent condition. I understand that things happen, the true value is how we handle adversity. I think that you and your team handled it very well and I received the parts in a very timely manor. Thank you so much. Sincerely, Vance Herron GM @ 7833

- C52040

Great easy to hookup!!

- C52040

Instructions could be a little clearer, but it does it’s job.

- C52040

Great service, quick delivery.

- C52041

Review from a similar Soft Trac I in Trailer Breakaway Kit

- C52041

Review from a similar Soft Trac I in Trailer Breakaway Kit

- C52041

Review from a similar Soft Trac I in Trailer Breakaway Kit

Product shipped and delivered fast. Installed in about 20 minutes. Hope I never have to find out if it works.

- C52041

Review from a similar Soft Trac I in Trailer Breakaway Kit

The battery is an excellent purchase.

- C52041

Review from a similar Soft Trac I in Trailer Breakaway Kit

Great Price,Excellent Service


Ask the Experts about this Curt Trailer Breakaway Kit

  • Is There a Curt Soft Trac Breakaway Kit that Has Battery Charge Indicator
    If you are looking for a similar trailer breakaway kit that has a built in charger and tester we have the Curt part # C52042 which will show you when it's charging and charged but the part # C52040 that you referenced does not have this feature.
    view full answer...
  • Is Pulling Out Breakaway Pin of Trailer Breakaway System Difficult
    Breakaway pins are designed to be somewhat difficult to pull out by hand which helps prevent them from accidentally getting pulled when not needed. I've yanked one out by hand once and I really had to pull hard on it. If this system was ever needed the weight of the trailer would be what pulls it out which is considerably more force than a person could exert by hand. I attached a review video link for more info on this for you to check out as well.
    view full answer...
  • Will Curt Replacement Cable and Pin Fit Breakaway Kit On 1980 Rockwood Freedom Camper
    The Replacement Cable and Pin, part # C52020 may work on the breakaway kit on your camper but you will need to verify the breakaway unit you have to make sure. This pin is designed to fit Curt Soft Trac I part # C52040 or # C52041, or Soft Trac II # C52028 or # C52026. If your breakaway kit is one of these then the # C52020 will work for you.
    view full answer...
  • Parts Needed to Add Electric Drum Brakes to a Trailer with 3500 Pound Axles
    For a 3500 pound axle you're going to need 10 by 2-1/4 inch brakes. I recommend the Self Adjusting Electric Brake Assembly # AKEBRK-35R-SA for the right hand side and # AKEBRK-35L-SA for the left. These are self adjusting brakes so they only need to be adjusted at installation. I've attached a review video on the brakes for you to take a look at. For a brake controller I suggest the Tekonsha Prodigy P2 # 90885 because of how easy it is to setup and to use. The controller will mount...
    view full answer...
  • Mounting Hole Pattern of Curt C52042 Push to Test Trailer Break Away System Battery Box
    I had one of the # C52042 push to test break away kits pulled from inventory, and found that the bolt pattern of the # C52042 measures 5-1/2 by 3-1/2 inches. I've linked though our in-stock systems and haven't found a push to test break away kit with the same 3 x 4-1/2 bolt pattern as the # C52040. However, since the # C52042 is larger, you could simply fasten it to the trailer frame by drilling through the bottom of the battery box, if you're reluctant to drill new mounting holes into...
    view full answer...
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Michael B
Installed by:
Michael B
Employee Chelsea B
Written by:
Chelsea B
Employee Sarah W
Updated by:
Sarah W
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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