OEX ACX1842 Circuit Breaker Manual Reset 30A

OEX ACX1842 Circuit Breaker Manual Reset 30A

Protect your 30A automotive circuits with confidence using the OEX ACX1842 Manual Reset Circuit Breaker, featuring IP67 waterproof and dust-resistant housing, stainless steel 8mm studs with rubber protective caps, manual reset function for immediate circuit restoration after a trip, compact 75 x 40 x 50mm dimensions, and robust construction for reliable overcurrent protection in automotive, marine, 4WD, caravan, RV, and commercial vehicle electrical installations.

Product Overview

The OEX ACX1842 is a 30A manual reset circuit breaker designed to provide reliable, resettable overcurrent protection for individual circuits in automotive, marine, and commercial vehicle electrical systems. Unlike blade fuses that must be replaced after a single overcurrent event, the ACX1842 can be manually reset and returned to service after a trip, making it ideal for circuits that may experience intermittent overloads or for installations where carrying replacement fuses is impractical. Manual reset circuit breakers require a deliberate reset action by the operator, ensuring the fault condition is identified and resolved before the circuit is restored, rather than automatically re-energising a potentially still-faulted circuit. This makes manual reset breakers the preferred choice for circuits connected to motors, winches, compressors, pumps, and high-draw accessories where nuisance tripping from temporary overloads is possible, and where a conscious reset decision improves operational safety. The IP67-rated waterproof and dust-resistant housing makes the ACX1842 suitable for external, under-bonnet, deck-mounted, and exposed installations where moisture and dust ingress would compromise a standard breaker. IP67 certification means the unit is rated for complete dust exclusion and temporary immersion in water, covering river crossings, high-rainfall conditions, and wash-down environments common in 4WD, agricultural, and marine applications. Stainless steel 8mm studs provide corrosion-resistant, high-current connection points compatible with standard automotive cable lugs, while the rubber stud caps protect the terminals from moisture, contamination, and accidental short circuits when not in use. Compact 75 x 40 x 50mm dimensions allow installation in tight spaces including engine bays, under-bonnet panels, chassis rails, and compact electrical enclosures. ISO 9001-certified manufacturing and in-house testing at OEX's Brisbane facility ensures consistent quality and long-term reliability.

Features & Benefits

Manual Reset for Controlled Circuit Restoration: The manual reset function requires a deliberate operator action to restore the circuit after a trip, ensuring the fault condition is identified and resolved before re-energising, making it the preferred choice for motor, winch, compressor, and pump circuits where automatic re-energisation after a fault could cause damage or create a safety hazard.

IP67 Waterproof and Dust-Resistant Housing: IP67 certification provides complete dust exclusion and protection against temporary water immersion, making the ACX1842 suitable for external, under-bonnet, deck-mounted, and exposed installations in 4WD, agricultural, marine, and commercial vehicle applications subject to rain, splash, wash-down, and off-road water exposure.

Stainless Steel 8mm Studs for Corrosion-Resistant Connections: Stainless steel 8mm stud terminals provide robust, corrosion-resistant connection points that maintain reliable electrical contact under vibration, thermal cycling, and exposure to moisture and automotive fluids in demanding installation environments.

Rubber Stud Caps for Terminal Protection: Rubber protective caps cover the stud terminals when not in use, protecting against moisture ingress, contamination, and accidental short circuits at the connection points between the circuit breaker and the connected cable lugs.

Resettable for Long-Term Service Without Consumables: Unlike blade or ANL fuses that must be replaced after a single overcurrent event, the ACX1842 can be tripped and reset repeatedly without replacement, eliminating the need to carry spare fuses for protected circuits and reducing long-term maintenance costs.

Compact 75 x 40 x 50mm Dimensions: The compact form factor enables installation in tight spaces including under-bonnet panels, chassis rail mounting locations, compact electrical enclosures, and 4WD accessory panels where full-size circuit breakers would not fit.

ISO 9001 Certified Manufacturing: Produced under ISO 9001 quality management certification with in-house product testing at OEX's Brisbane facility, ensuring consistent quality and long-term reliability across automotive, marine, RV, mining, and commercial vehicle applications.

Technical Specs

Compatible With / Goes Well With

The OEX ACX1842 suits 12V and 24V automotive, marine, caravan, RV, 4WD, agricultural, and commercial vehicle electrical systems requiring resettable 30A overcurrent protection on individual circuits. Ideal for winch circuits, air compressor feeds, water pump protection, lighting circuit protection, auxiliary battery circuit breakers, accessory panel protection, and any 30A circuit where a resettable breaker is preferred over a replaceable fuse. Compatible with standard cable lugs for 8mm stud terminals across a range of wire gauges appropriate for 30A circuits. Complements OEX fuse holders, distribution blocks, ANL fuse holders, and battery accessories for complete circuit protection and power management solutions.

Frequently Asked Questions

What is the difference between a manual reset and an automatic reset circuit breaker?

A manual reset circuit breaker requires a deliberate operator action to restore the circuit after it trips on an overcurrent event. An automatic reset breaker re-energises the circuit automatically once it cools down. Manual reset is preferred for motor, winch, compressor, and pump circuits where automatic re-energisation after a fault could cause equipment damage or a safety hazard. It also ensures the operator is aware the circuit has tripped and can investigate the cause before restoring power.

Can the ACX1842 be used as a replacement for a blade fuse or ANL fuse?

Yes, in principle. A manual reset circuit breaker performs the same overcurrent protection function as a fuse but can be reset rather than replaced. The key difference is that a blown fuse requires the fault current to physically destroy the fuse element, providing a clear record of the overcurrent event, while a circuit breaker can be reset without any physical evidence of the trip. Both are valid overcurrent protection solutions depending on the application and installation requirements.

What wire gauge is appropriate for a 30A circuit breaker?

For a 30A continuous circuit, a minimum of 4mm² (approximately 11 AWG or 12 B&S) automotive grade cable is typically recommended for runs up to approximately 5 metres. For longer cable runs or high-duty-cycle applications, upsize to 6mm² to reduce voltage drop. Always match wire gauge to both the actual current draw of the circuit and the cable run length for safe, efficient operation.

Is the ACX1842 suitable for marine deck installations?

Yes. The IP67 rating certifies the ACX1842 for complete dust exclusion and temporary water immersion, making it suitable for marine deck-mounted installations, external 4WD body mounting, and other exposed locations subject to rain, splash, and wash-down. For permanent marine deck installations, apply marine-grade sealant around the mounting surface perimeter and ensure cable entry points are sealed against water tracking along the cable into the breaker housing.

Where should the ACX1842 be installed in a circuit?

The circuit breaker should be installed as close as practical to the power source, ideally within 300mm of the battery terminal or distribution point it is protecting. Installing the breaker close to the power source ensures the shortest possible length of unprotected cable between the battery and the overcurrent protection device, minimising the risk of cable damage in the event of a short circuit between the battery and the breaker.