OEX ACX2084BL 40A Mini Manual Reset Circuit Breaker Type 3 Switchable

OEX ACX2084BL 40A Mini Manual Reset Circuit Breaker Type 3 Switchable

Protect high-current circuits in a compact, compliant package with the OEX ACX2084BL 40A mini manual reset circuit breaker featuring Type 3 switchable operation for combined circuit protection and isolation, IP66 waterproof and dustproof housing for exposed installation environments, UL 94VO rated thermal plastic housing for fire-resistant safety, SAE J553, J1171, and UL1500 ignition-protected compliance for marine and automotive applications, an extended operating temperature range of -40°C to 85°C for extreme-condition reliability, #10-32 threaded studs with protective insulators accepting 6mm or ¼ inch terminal lugs, and OEX ISO 9001 certified quality built for demanding Australian automotive, marine, and industrial conditions.

Product Overview

The OEX ACX2084BL is a high-current capable Type 3 mini manual reset circuit breaker delivering professional-grade 40-amp overcurrent protection and circuit isolation in the compact surface mount form factor of the ACX2080 series — bridging the gap between the 30A ACX2083BL and heavier-duty full-size breakers for applications demanding more current capacity without sacrificing installation flexibility. At 40 amps, the ACX2084BL is suited to protecting high-current circuits including large electric air compressors, heavy-duty winch control feeds, high-output inverters up to approximately 480W (12V) or 960W (24V), high-draw marine thrusters, electric outboard motor control circuits, dual-battery charge feed outputs, and multi-circuit panel distribution feeds in automotive, marine, caravan, and 4WD installations. The compact 58.2 x 35.7 x 34.7mm dimensions allow installation in electrical panels, switch panels, and confined locations where full-size heavy duty breakers would be impractical, while the surface mount design eliminates the need for a dedicated housing or enclosure. The switchable Type 3 functionality provides dual capability as both overcurrent protection and manual on/off circuit isolation, enabling deliberate circuit shutdown without requiring a fault event — essential for high-current systems including compressors, winches, and inverter feeds where controlled isolation is a safety and operational requirement. The ACX2084BL is also the entry point into the ACX2080 5-pack range, making it an economical choice for multi-circuit panel builds or fleet installations requiring multiple breakers of the same rating. SAE J553, J1171, and UL1500 ignition-protected compliance certifications confirm the ACX2084BL meets recognised international standards for use in fuel-vapour environments on marine vessels.

Features & Benefits

40A Type 3 Switchable Manual Reset Handles high-current circuit protection and manual isolation in a compact mini form factor, covering demanding loads including large compressors, winch feeds, and high-output inverter circuits without requiring a full-size heavy duty breaker.

Available as Single Pack or 5-Pack The ACX2084BL is the entry point into the ACX2080 5-pack range, offering significant value for multi-circuit panel builds, fleet installations, and workshops requiring multiple 40A breakers for consistent system builds.

Compact Mini Surface Mount Design The 58.2 x 35.7 x 34.7mm form factor fits neatly into electrical panels, switch panels, and confined spaces where standard full-size circuit breakers are too large, simplifying installation in tight locations.

IP66 Waterproof & Dustproof Housing Rated against powerful water jets and complete dust ingress, enabling reliable installation in exposed marine cockpit, deck, outdoor equipment, and under-bonnet panel locations subject to wash-down and environmental exposure.

UL 94VO Rated Thermal Plastic Housing Fire-resistant housing material certified to UL 94VO flammability standard, providing an important safety layer in automotive and marine applications where fire risk from electrical faults must be minimised.

SAE J553, J1171 & UL1500 Compliant Meets recognised international automotive and marine electrical standards including ignition protection certification, confirming suitability for use in fuel-vapour environments such as marine engine bays and enclosed bilge areas.

Extended Operating Temperature Range Rated from -40°C to 85°C for reliable performance across extreme cold and heat conditions encountered in alpine, desert, tropical marine, and industrial mobile equipment applications throughout Australia and beyond.

#10-32 Threaded Studs with Protective Insulators Standard threaded studs accept 6mm or ¼ inch terminal lugs for secure, vibration-resistant connections, with included protective stud insulators maintaining terminal safety and preventing accidental contact.

Technical Specs

Compatible With / Goes Well With

The OEX ACX2084BL is compatible with 12V and 24V DC electrical systems up to 32VDC across passenger vehicles, 4WD, caravans, motorhomes, marine vessels, and light industrial mobile equipment. Well suited to protecting large air compressor circuits, heavy-duty winch control feeds, high-output inverter circuits, marine bow and stern thrusters, dual-battery system charge feed outputs, electric outboard motor control circuits, and high-demand auxiliary loads up to 40 amps. Also available in 10A, 15A, 20A, 30A, 50A, and 60A single packs for matching protection to specific circuit requirements, with 5-packs available in 40A, 50A, and 60A for multi-circuit panel builds. Pairs well with OEX distribution blocks, OEX switch panels and accessories, OEX wiring harnesses and cable accessories, and OEX terminal connectors and busbars for complete circuit protection and distribution system installations.

Frequently Asked Questions

When should I choose the 40A ACX2084BL over the 30A ACX2083BL for my circuit?

Choose the 40A ACX2084BL when your circuit's continuous current draw exceeds 30 amps or when protecting high-current loads such as large air compressors drawing up to 32 amps continuous, heavy-duty winch control feeds, inverters drawing above 24 amps, marine thrusters, or multi-output distribution feeds where combined load approaches 32 amps continuous. Applying the standard 125% sizing rule, the 40A ACX2084BL is the correct choice for circuits with a maximum continuous draw of up to 32 amps. For circuits drawing above 32 amps continuous, step up to the 50A variant in the ACX2080 series, or consider the heavy duty OEX ACX1844 for applications requiring higher voltage tolerance or IP67 submersion protection.

Is the ACX2084BL suitable for protecting a winch circuit on my 4WD?

The ACX2084BL at 40A is suitable for winch control circuits and smaller winches, but it is important to note that the maximum voltage rating of 32VDC limits the ACX2084BL to 12V and 24V systems only. For winch protection, it is also critical to note that winch circuits can draw very high peak currents during recovery — often 100A or more under full load — and in these cases the circuit protection device should be installed on the control/signal feed rather than the main high-current winch motor cable. For main winch motor cable protection at full rated draw, a heavy duty ANL fuse or the OEX ACX1844 heavy duty breaker is more appropriate.

What does the UL1500 ignition protection compliance mean for marine installations?

UL1500 is the Underwriters Laboratories standard for ignition protection of marine products. It certifies that the ACX2084BL is designed and tested to not ignite flammable fuel vapours that may be present in marine engine compartments and bilge areas. This compliance is a requirement under many marine safety standards including those referenced by Australian Maritime Safety Authority (AMSA) guidelines, and is an important consideration when installing electrical components in enclosed spaces near fuel tanks, fuel lines, or bilge areas on boats and vessels.

What terminal lug and cable size should I use for the ACX2084BL on a 40A circuit?

The ACX2084BL's #10-32 threaded studs accept terminal lugs with a 6mm or ¼ inch hole. For a 40A circuit, appropriately sized wire — typically 8 AWG / 8mm² for runs up to 3 metres, or 6 AWG / 10mm² for longer runs or installations where minimising voltage drop is critical — terminated with a correctly crimped ring terminal lug is recommended. Always use a ratchet crimping tool for reliable, gas-tight crimps and confirm the lug hole matches the 6mm or ¼ inch stud size for a secure, vibration-resistant termination.

What other amperage options are available in the OEX ACX2080 Mini Circuit Breaker range?

The ACX2080 series is available in single packs across seven amperage ratings: 10A (ACX2080BL), 15A (ACX2081BL), 20A (ACX2082BL), 30A (ACX2083BL), 40A (ACX2084BL), 50A, and 60A, allowing you to match the breaker precisely to each circuit's requirements. The ACX2084BL is also available as a 5-pack for multi-circuit panel builds and fleet installations — as are the 50A and 60A variants. All variants share the same compact Type 3 switchable mini form factor, IP66 rating, and SAE/UL compliance, making it straightforward to standardise on the ACX2080 series across an entire electrical system build.