OEX ACX2085BL 50A Mini Manual Reset Circuit Breaker Type 3 Switchable

OEX ACX2085BL 50A Mini Manual Reset Circuit Breaker Type 3 Switchable

Protect very high-current circuits in a compact, compliant package with the OEX ACX2085BL 50A 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 ACX2085BL is the second-highest rated variant in the compact ACX2080 mini circuit breaker series, delivering professional-grade 50-amp overcurrent protection and circuit isolation in the same space-efficient surface mount form factor shared across the range. At 50 amps, the ACX2085BL handles the most demanding loads a compact mini breaker is typically called upon to protect — including large capacity DC-DC charger outputs, high-draw solar charge controller feeds, Anderson plug distribution circuits, heavy-duty electric winch control feeds, large marine thrusters, multi-circuit auxiliary panel main feeds, and high-output inverter input circuits up to approximately 600W (12V) or 1200W (24V) 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 or oversized, 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 — critical for high-current system feeds where controlled isolation is a safety and operational priority. Available as both a single pack and a 5-pack, the ACX2085BL suits both individual circuit installations and larger multi-circuit panel builds requiring consistent high-current protection across multiple outputs. SAE J553, J1171, and UL1500 ignition-protected compliance certifications confirm the ACX2085BL meets recognised international standards for use in fuel-vapour environments on marine vessels.

Features & Benefits

50A Type 3 Switchable Manual Reset Delivers very high-current circuit protection and manual isolation in a compact mini form factor, covering the most demanding loads a surface mount mini breaker is typically asked to handle including DC-DC charger feeds, solar controller outputs, and large inverter circuits.

Available as Single Pack or 5-Pack Suits both single circuit installations and larger multi-circuit panel builds, offering significant value when multiple 50A protection points are required across a system or fleet installation.

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 ACX2085BL 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 DC-DC charger output feeds, solar charge controller distribution circuits, Anderson plug panel feeds, large marine thruster circuits, multi-circuit auxiliary panel main feeds, high-output inverter input circuits, and very high-demand auxiliary loads up to 50 amps. Also available in 10A, 15A, 20A, 30A, 40A, 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 Anderson plug assemblies, 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 50A ACX2085BL over the 40A ACX2084BL for my circuit?

Choose the 50A ACX2085BL when your circuit's continuous current draw exceeds 40 amps or when protecting very high-current loads such as DC-DC charger outputs (typically 30–40A continuous), large solar charge controller distribution feeds, Anderson plug panel main feeds, or multi-output auxiliary distribution circuits where combined continuous load approaches 40 amps. Applying the standard 125% sizing rule, the 50A ACX2085BL is the correct choice for circuits with a maximum continuous draw of up to 40 amps. For circuits drawing above 40 amps continuous, step up to the 60A ACX2086BL, or consider the heavy duty OEX ACX1844 for applications also requiring 72VDC voltage tolerance or IP67 submersion-rated protection.

Can the ACX2085BL protect a DC-DC charger or MPPT solar controller output circuit?

Yes, the 50A ACX2085BL is well suited to protecting DC-DC charger and MPPT solar charge controller output distribution circuits, particularly for units rated up to 40A continuous output. As a guide, a 40A DC-DC charger or MPPT controller output circuit requires a protection device rated at approximately 50A — making the ACX2085BL a natural fit. The switchable function also provides a practical means of isolating the charger circuit from the auxiliary battery bank when needed, without requiring a separate isolation switch in the circuit.

What terminal lug and cable size should I use for the ACX2085BL on a 50A circuit?

The ACX2085BL's #10-32 threaded studs accept terminal lugs with a 6mm or ¼ inch hole. For a 50A circuit, appropriately sized wire — typically 6 AWG / 10mm² for runs up to 3 metres, or 4 AWG / 16mm² 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 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 ACX2085BL 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 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 (ACX2085BL), and 60A (ACX2086BL), allowing you to match the breaker precisely to each circuit's requirements. The ACX2085BL is also available as a 5-pack for multi-circuit panel builds and fleet installations — as are the 40A 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.