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.
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 |
