Alvolta Auto-Reset Circuit Breaker 40A

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40A auto-reset (cycling) circuit breaker, surface mount, M5 studs, IP67

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ALVOLTA

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Category: SALE, Circuit Protection, Circuit Breakers, Surface Mount

SKU: CB12140

Alvolta Auto-Reset Circuit Breaker 40A

Breaker features

40A automatic reset (thermal, cycling)
Suits 12-24V systems
Type I, single pole

Build

Surface mount, M4 mounting holes
M5 terminal studs
IP67 rated
SAE J553

Where to use it

The Alvolta Auto-Reset Circuit Breaker 40A protects circuits where short overloads are expected and manual resetting would be inconvenient, such as lights, motors, winches, trailer brakes and accessories in vehicles, boats, caravans and off-grid setups. It resets itself once it cools.

Because it resets automatically, it will keep cycling if a fault remains, so fix the cause of repeated trips. Choose the rating to protect the cable. It is backed by a 1-year warranty.

Dimensions

Length	51 mm
Width	21 mm
Height	35 mm
Weight	0.03 kg

Safety features

IP67 rated
SAE J553

Warranty

1-year warranty

Applications

Marine

RV's

Caravans

Off-Grid Systems

Tiny Houses

Cabins

About Alvolta

Australian-owned and operated, and driven by a passion for excellence, Alvolta offers unwavering performance and durability even in harsh Australian conditions. Alvolta specialises in precision-engineered DC components, designed to enhance off-grid adventures. Their commitment to delivering superior power performance with uncompromising quality is evident in their lineup of solar panels, solar charge controllers, circuit protection devices, mounting solutions, tools, and more. Supply yourself with all the arsenal you need to extend your power supply and adventure for longer with Alvolta.

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An auto-reset circuit breaker is a protective device that automatically interrupts electrical current when a fault or overload occurs, then resets itself once the fault clears. Unlike manual or fuse-based protection, it doesn’t need to be replaced or reset by hand, making it ideal for 12V and 24V systems commonly used in vehicles, caravans, and boats.

Auto-reset circuit breakers are commonly used in automotive, marine, and off-grid applications, including 4WDs, camper trailers, caravans, and boats. They’re perfect for circuits where occasional short-term overloads occur, such as lighting, pumps, or accessory circuits, and where easy, continuous protection is required without manual resetting.

An auto-reset breaker automatically restores power once it cools down after tripping, while a manual-reset breaker stays off until it’s manually reset by pressing a button or flipping a switch. Auto-reset types are great for non-critical loads, while manual-reset breakers are preferred for safety-critical systems where you need to identify and fix the fault before restoring power.

To select the correct breaker rating, match the amperage to your circuit’s expected continuous current draw, which is typically about 125% of the load current. For example, if your circuit draws 8A continuously, use a 10A breaker. Always refer to manufacturer guidelines and consider the wire size and device specifications for safe protection.

Many auto-reset circuit breakers are designed for dry environments, but weatherproof or sealed versions are available for marine, off-road, or outdoor use. If your installation is exposed to moisture, dust, or vibration, choose a breaker with a sealed housing or IP-rated protection to ensure long-term reliability.

Product Specifications

Model	CB12140
Amperage	40A
Mounting	Surface
Function Type	Thermal trip-free, cycling (auto reset)
Poles	1
Class	Type I
Terminal Stud	M5
Mounting Holes	M4
IP Rating	IP67
Compliance	SAE J553
Dimensions	51 x 21 x 35 mm
Weight	0.03 kg
Warranty	1 Year