Trailer Electrical / 12 Volt DC Circuit Protection
Brophy 12 Volt DC Auto-Reset Circuit Breaker - 15 Amp
A compact 15 amp 12V DC auto-reset circuit breaker for trailer, RV, utility, automotive, and accessory wiring circuits. Designed to protect wiring from overloads without staying blown like a traditional fuse.
Part Number: B15A 15 Amp Rating Auto-Reset Breaker
Key Measurements & Specs
| Specification |
Detail |
| Part Number / SKU |
B15A |
| Brand |
R&P Carriages / aftermarket trailer electrical component |
| Product Type |
Auto-reset DC circuit breaker |
| Voltage |
12 Volt DC |
| Amp Rating |
15 amp |
| Overall Body Size |
1-5/16" long x 1-1/4" tall overall |
| Mounting Ear Width |
2" wide overall |
| Material / Finish |
Durable Plastic |
| Quantity Included |
1 circuit breaker with nuts and lock washers |
Fitment / Application
| Category |
Details |
| Vehicle / Trailer / System |
12V DC electrical circuits |
| Primary Fit |
Trailer, RV, utility, automotive, and accessory wiring circuits requiring 15 amp protection |
| Mounting Method |
Two 1/4" mounting holes spaced 1-9/16" center to center |
| Terminal Style |
Two #10 studs, 9/16" tall, spaced 11/16" center to center |
| Important Note |
Verify circuit amperage, wire gauge, mounting space, and terminal layout before ordering. |
Top Features
| Feature |
Buyer Benefit |
| Auto-Reset Operation |
Trips under overload and automatically resets after the overload condition clears. |
| 15 Amp Circuit Protection |
Helps protect properly matched 12V DC wiring circuits from overloads. |
| Compact Mounting Footprint |
Small body and mounting ears allow installation in tight wiring areas. |
| Included Terminal Hardware |
Nuts and lock washers are included for the #10 stud terminals. |
Overview
This B15A 12 Volt DC circuit breaker is a 15 amp auto-reset electrical protection component for low-voltage wiring systems. It works like a fuse by interrupting an overload condition, but it does not stay blown after tripping. Once the overload condition clears, the breaker automatically resets.
R&P Service Insight
When replacing a circuit breaker, match the amp rating and terminal layout to the original circuit. Do not increase breaker amperage to stop nuisance tripping unless the wiring, load, and circuit design are verified for the higher rating.
-
Match the circuit: Use this breaker only where 15 amp protection is correct for the wiring and connected load.
-
Check the terminals: This breaker uses two #10 studs spaced 11/16" center to center.
-
Inspect the wiring: Repeated trips can indicate shorts, corrosion, poor grounds, damaged insulation, or excessive current draw.
R&P Knowledge Hub
Compatibility: Designed for 12V DC circuits that require 15 amp circuit protection. Verify before ordering if replacing an existing breaker.
Vehicle / System Fit: Commonly used in trailer, RV, utility, automotive, and accessory wiring applications where the circuit design calls for a 15 amp auto-reset breaker.
Installation Notes: Mounts using two 1/4" holes spaced 1-9/16" center to center. Electrical connections use two #10 studs with included nuts and lock washers.
Performance Insight: Auto-reset breakers are useful where temporary overload protection is needed without replacing a fuse after each trip.
Brand & Fitment Note
Selling Brand: R&P Carriages / aftermarket trailer electrical component
Application Reference: Trailer, RV, utility, automotive, and accessory references describe common 12V DC circuit use only.
What This Means: This listing is for one 15 amp 12V DC auto-reset circuit breaker, Part #B15A.
Before Ordering: Verify amperage, voltage, mounting hole spacing, terminal style, stud spacing, wire gauge, and circuit requirements before installation.
R&P Repair Insight
A circuit breaker should protect the wiring, not hide an electrical problem. If a breaker repeatedly trips, inspect the circuit before replacing parts or changing amp ratings.
-
Repeated tripping: Check for pinched wiring, shorts, corrosion, damaged insulation, or a load drawing more than the circuit should carry.
-
Correct rating: Replace with the correct required amp rating for the circuit. Do not oversize the breaker to avoid trips.
-
Clean connections: Secure terminals and clean contact points help reduce resistance, heat buildup, and intermittent electrical issues.
Features
15 Amp 12V DC Protection
Provides overload protection for 12 Volt DC circuits that require a 15 amp breaker.
Auto-Reset Breaker Design
Trips during overload and automatically resets after the overload condition clears.
Compact Mounting Layout
Uses two 1/4" mounting holes spaced 1-9/16" center to center with 2" wide mounting ears.
Stud-Style Connections
Two #10 studs provide secure wire connection points and include nuts and lock washers.
Included Components
| Quantity |
Item |
| 1 |
15 amp 12 Volt DC auto-reset circuit breaker, Part #B15A |
| Included |
Nuts and lock washers for #10 stud terminals |
Important Fitment Note: Verify circuit amperage, voltage, wire gauge, mounting space, terminal style, stud spacing, and mounting hole spacing before installation. Do not substitute a higher-rated breaker unless the wiring and connected load are designed for that rating.
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