At a Glance
- SKU: B20A
PRODUCT INFORMATION
Product Details
Trailer Electrical Protection / 12 Volt DC Circuit Breaker
Brophy 12 Volt DC Auto Reset Circuit Breaker - 20 Amp
A 20 amp 12 volt DC circuit breaker designed to help protect trailer, automotive, and equipment wiring from electrical overloads. This breaker works like a fuse, but automatically resets after tripping instead of staying blown.
Part Number: B20A 20 Amp Rating Auto Reset Style
Key Measurements & Specs
| Specification | Detail |
|---|---|
| Part Number / SKU | B20A |
| Product Type | 12 volt DC auto reset circuit breaker |
| Amp Rating | 20 amp |
| Mounting Hole Size | Two 1/4" mounting holes |
| Mounting Hole Spacing | 1-9/16" center to center |
| Terminal Studs | Two #10 studs, 9/16" tall, spaced 11/16" center to center |
Fitment / Application
| Category | Details |
|---|---|
| System Type | 12 volt DC wiring systems |
| Common Use | Trailer, automotive, utility, and equipment electrical circuits where a 20 amp breaker is required |
| Fitment Method | Match amp rating, mounting hole spacing, terminal style, and circuit requirements before ordering |
| Important Note | Use only where a 20 amp breaker is correct for the wiring and circuit being protected |
Top Features
| Feature | Buyer Benefit |
|---|---|
| Auto Reset Design | Trips when overloaded and automatically resets instead of staying blown like a fuse |
| 20 Amp Protection | Helps protect properly matched 12 volt DC circuits from overload conditions |
| Stud Terminals | Two #10 studs provide a secure connection point for ring terminal wiring |
| Mounting Ears | Two mounting holes allow the breaker to be secured in place during installation |
Overview
The B20A is a 20 amp, 12 volt DC auto reset circuit breaker for electrical circuit protection in compatible trailer, automotive, and equipment wiring applications. It is designed to trip during an overload and reset automatically, making it a practical replacement or service part where the circuit calls for a 20 amp breaker.
R&P Service Insight
Electrical protection parts should always be matched to the circuit, not guessed by appearance alone. Before replacing a breaker, confirm the original amp rating and inspect the wiring for damage or shorts that may have caused the breaker to trip.
- Match the Rating: Replace with the correct amp rating required by the circuit.
- Check the Wiring: Look for pinched wires, corrosion, loose terminals, or damaged insulation before installation.
- Verify Mounting: Confirm the 1-9/16" mounting hole spacing and #10 stud layout fit your application.
R&P Knowledge Hub
Compatibility: Compatible with 12 volt DC electrical systems that require a 20 amp auto reset circuit breaker and match the listed mounting and terminal measurements.
Vehicle / System Fit: Commonly used in trailer, automotive, equipment, and utility wiring where overload protection is required.
Installation Notes: Disconnect power before service. Use properly sized terminals, secure the connections, and confirm the breaker is mounted away from moving parts, moisture exposure, and heat sources when possible.
Performance Insight: An auto reset breaker works like a fuse for overload protection, but it resets after tripping instead of remaining open like a blown fuse.
Brand & Fitment Note
Selling Brand: R&P Carriages
Application Reference: Trailer, automotive, and equipment system references are compatibility examples only. The buyer must confirm the correct amp rating and physical fit before ordering.
What This Means: This listing is for a 20 amp 12 volt DC auto reset circuit breaker, not a guaranteed OEM-branded item unless specifically stated and verified.
Before Ordering: Verify amp rating, voltage, mounting hole spacing, terminal style, available space, wire size, and circuit requirements before installation.
R&P Repair Insight
If a circuit breaker trips repeatedly, the breaker may not be the only issue. Repeated tripping can indicate a short, overloaded circuit, poor connection, damaged wire, or incorrect component rating.
- Breaker Rating: Confirm the circuit is designed for a 20 amp breaker before replacing the old part.
- Terminal Condition: Clean or replace corroded ring terminals and tighten the included nuts and lock washers securely.
- Material Variation: Product housing may vary between plastic or metal as shown in product photos.
Features
20 Amp Circuit Protection
Designed for compatible 12 volt DC circuits that require a 20 amp breaker for overload protection.
Auto Reset Operation
Trips during an overload and automatically resets, helping avoid the one-time-use limitation of a standard fuse.
Compact Mounting Footprint
Mount ears measure 2" wide overall, with a body length of 1-5/16" and an overall height of 1-1/4".
Included Terminal Hardware
Includes nuts and lock washers for the two #10 terminal studs.
Included Components
| Quantity | Item |
|---|---|
| 1 | 20 amp 12 volt DC auto reset circuit breaker, Part #B20A |
| Included | Nuts and lock washers for terminal studs |
| Not Included | Wiring, ring terminals, mounting screws, and installation tools |
Important Fitment Note: Product may vary between plastic or metal housing as shown in the product photos. Always verify 20 amp rating, 12 volt DC system use, mounting hole spacing, terminal layout, available clearance, wire condition, and circuit requirements before installation.
B20A 20 amp circuit breaker, 12 volt DC auto reset circuit breaker, trailer wiring circuit breaker, auto reset breaker 20 amp, trailer electrical overload protection, two stud circuit breaker, #10 stud circuit breaker, 12V DC breaker for trailer wiring, R&P Carriages electrical parts
Related Parts & Kits
Check fitment, measurements, and kit contents before ordering. Related parts may not be required for your repair.
Looking up part numbers in our catalog…
Your repair list1 item selected
Selected products are added together. Review the cart and verify kit contents to prevent duplicates. Prices and discounts are determined at checkout.
BEHIND THIS LISTING
PHOTOGRAPHY & RESEARCH
Ariah Granados
DIGITAL PRESENTATION & DEVELOPMENT
Ken Martin
ONLINE SALES & QUALITY ASSURANCE
Rayn Fisher
WE’RE HERE TO HELP
Not sure it fits?
Have your SKU or manufacturer part number, photos of the original part and mounting, and any critical measurements ready. Capacity, voltage, or bolt pattern can help too.
815-357-3292 · 270 E Jackson St · Seneca, IL 61360
CUSTOMER REVIEWS
Leave a Google review
Good people. Real trailer work.
Customer feedback summarized from Google and Yellow Pages. Dates are shown where available.
TRAILER PARTSGOOGLE
Ordered trailer repair parts repeatedly; praised fast service, careful packing, and accurate orders.
RV KEYSGOOGLE
Found the correct RV keys at a good price with free shipping; the keys worked as expected.
AXLE & LEAF SPRINGSGOOGLE
Needed an unusual axle and leaf-spring size; the team listened and helped him sort out the fit.
PARTS & SHIPPINGGOOGLE
Praised the OEM and aftermarket selection, discounts, quick shipping, and friendly parts staff.
CUSTOM AXLEGOOGLE
Got the axle he needed right away, set up with a custom spring perch.
WELDINGGOOGLE
Praised the polite staff and quality welding on a project.
GAS STRUTGOOGLE
Replacement struts brought a long-used door back to working order.
CUSTOM TRAILERGOOGLE
Had a trailer built to his needs at a fair price, then found parts for two other trailers in stock.
CUSTOMER SERVICEGOOGLE
Praised the customer service after working with R&P over several years.
GAS SHOCKGOOGLE
Found the gas shock he wanted at a good price with shipping included.
CARGO TIE-DOWNGOOGLE
Received swivel D-rings with backing plates and praised the price, correct order, and service.
PARTS DELIVERYGOOGLE
The right parts arrived the first time, with fast delivery and helpful staff.
PROJECT HELPYELLOW PAGES
Said project advice and prompt shipping helped finish a trailer project.
SHIPPINGYELLOW PAGES
Reported helpful service and fast shipment to Germany.
SUSPENSION KITYELLOW PAGES
Praised a suspension kit, fair pricing, and good parts.
TRAILER CORDYELLOW PAGES
Was pleased with a replacement trailer cord.
SERVICE & PARTSYELLOW PAGES
Noted dependable service and products across repeat visits.
AXLE INSTALLATIONYELLOW PAGES
Said the axle installation fit perfectly and thanked Josh and the crew.
HITCH REPLACEMENTYELLOW PAGES
Praised the crew’s professionalism during a difficult hitch replacement.
PRICE & SERVICEYELLOW PAGES
Liked the product, price, communication, and shipping.
LISTING INFORMATIONYELLOW PAGES
Said the product description explained what would work for the trailer.
PRODUCT & SHIPPINGYELLOW PAGES
Received the item as described with very fast shipping and plans to return.
COMMUNICATION & SHIPPINGYELLOW PAGES
Praised accurate description, quick shipping, and clear communication.
PRICE & PRODUCTYELLOW PAGES
Was happy with the product and its price.
SELLER EXPERIENCEYELLOW PAGES
Called it a pleasure doing business with R&P.
INSTALLATIONYELLOW PAGES
Was pleased with product quality, quick delivery, and an easy installation.
PRODUCTSYELLOW PAGES
Was enthusiastic about the products.
DURABILITYYELLOW PAGES
Was ready to install the product on every trailer they own.
REPEAT CUSTOMERYELLOW PAGES
Expected to buy again after a good experience.
INSTALLED PARTYELLOW PAGES
Reported that the newly installed parts were working perfectly.
REPEAT CUSTOMERYELLOW PAGES
Said things went well, as they had on previous visits.
COMMUNICATION & VALUEYELLOW PAGES
Praised clear communication and fair value.
TRANSACTIONYELLOW PAGES
Said the transaction went as expected.
PRICE & PACKAGINGYELLOW PAGES
Noted good value, careful packing, and fast shipping.
PROFESSIONAL SERVICEYELLOW PAGES
Found the team professional and easy to work with.
COMMUNICATION & SHIPPINGYELLOW PAGES
Praised fast shipping and good communication.
TEAMYELLOW PAGES
Shared appreciation for the owners and their company.
SHIPPINGYELLOW PAGES
Reported prompt shipping and said they would buy again.
CUSTOMER SERVICEYELLOW PAGES
Found R&P easy to deal with.
SERVICEYELLOW PAGES
Praised the people and the service.
FIT & SHIPPINGYELLOW PAGES
Reported a good fit, fair price, accurate listing, and quick shipping.
DELIVERYYELLOW PAGES
Received the order a day early and recommended the seller.
CUSTOM TRAILERYELLOW PAGES
Described a no-hassle, professional custom-trailer purchase.
TRAILER PURCHASEYELLOW PAGES
Praised a new trailer, custom additions, helpful staff, and clear pricing.
HUB COVERSYELLOW PAGES
Found the right hub covers quickly and got helpful maintenance advice.
AXLE HELPYELLOW PAGES
Said R&P helped their company get back on the road after an axle problem.
DUMP TRAILERYELLOW PAGES
Was happy with a dump-trailer purchase after comparing options.
BRAKES, DRUMS & SEALSYELLOW PAGES
Received clear help choosing brake assemblies and bearing seals, followed by fast shipping.
DUMP TRAILERYELLOW PAGES
Found a good deal on a 16-foot dump trailer and planned to return.
FRIENDLY SERVICEYELLOW PAGES
Thanked the staff for their patience and recommended the shop.
Showing 3 of 50
Need help with this part? Send photos, part numbers, and measurements. We’ll help you narrow it down.