Description
Dependable 30A MIDI Fuse Protection for Dual Battery, Caravan, and Automotive Electrical Circuits.
Product Overview
The OEX ACX6503 is a pack of 10 bolt-on MIDI fuses rated at 30A and 32V DC, designed to protect lower to mid-current circuits in automotive, 4WD, caravan, and marine electrical installations. Made from copper with a tin-plated finish for corrosion resistance, each fuse features a visible element window for fast, non-removal fault diagnosis a practical advantage in enclosed battery boxes, underbonnet fuse panels, and any installation where access is limited.
Using the SF30 form factor with 30mm centre-to-centre bolt mounting, the ACX6503 is compatible with standard MIDI fuse holders including the OEX ACX6514. The pack of 10 suits workshop stock replenishment and multi-circuit builds requiring consistent 30A protection. A single-pack variant is also available as ACX6503BL for individual replacement needs.
Key Specifications
- Fuse type: MIDI, bolt-on
- Current rating: 30A
- Voltage rating: 32V DC
- Type designation: SF30
- Conductor material: Copper, tin-plated
- Feature: Fuse element window (visible blow indicator)
- Mounting: Centre to centre 30mm
- Pack quantity: 10
- Single pack variant: ACX6503BL
- Length: Not specified — confirm with OEX
- Weight: Not specified — confirm with OEX
- Warranty: Not specified — confirm with OEX
Features & Benefits
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30A Circuit Protection — Provides reliable overcurrent protection for mid-current automotive circuits including solar charge controller feeds, auxiliary lighting, refrigeration compressors, secondary battery chargers, and accessory wiring rated at or below 30A.
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Fuse Element Window — A transparent window in the fuse body lets you confirm visually whether the element has blown without removing the fuse from its holder — saving time during fault diagnosis in enclosed installations and hard-to-reach fuse panels.
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Copper Tin-Plated Construction — Tin plating over the copper element resists corrosion at the contact surfaces, maintaining low contact resistance and reliable performance in humid, coastal, and marine-adjacent environments over the life of the installation.
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32V DC Rated — Covers both 12V and 24V automotive, caravan, and marine electrical systems with voltage headroom, making it suitable across all standard vehicle and off-grid power configurations.
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30mm Centre-to-Centre Bolt Mounting — Standard MIDI fuse mounting pitch ensures broad compatibility with SF30-format MIDI fuse holders across the market, including the OEX ACX6514.
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SF30 Form Factor — An industry-standard MIDI fuse format widely used in automotive, caravan, and marine applications, ensuring straightforward replacement sourcing across Australia.
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Pack of 10 — Suited to workshop stock, multi-circuit vehicle builds, and caravan electrical fitouts where multiple circuits require the same 30A protection rating. Individual replacement fuses available as ACX6503BL.
Technical Specs
| Specification |
Detail |
| Brand |
OEX |
| Part Number |
ACX6503 |
| Fuse Type |
MIDI |
| Type Designation |
SF30 |
| Mounting |
Bolt-On |
| Current Rating |
30A |
| Voltage Rating |
32V DC |
| Conductor Material |
Copper, Tin-Plated |
| Fuse Element Window |
Yes (visual blow indicator) |
| Mount Centre to Centre |
30mm |
| Pack Quantity |
10 |
| Length |
Not specified |
| Weight |
Not specified |
| Warranty |
Not specified — confirm with OEX |
| Single Pack Variant |
ACX6503BL |
Compatible With / Goes Well With
Suitable applications:
- Solar charge controller and battery-to-battery charger circuit protection
- Auxiliary lighting and LED light bar wiring
- Caravan refrigerator and compressor fridge circuits
- Dual battery secondary circuit protection
- Marine and caravan auxiliary power fusing
- Accessory wiring for 4WDs and touring caravans
- Fleet vehicle and commercial auto electrical installations
Pairs well with:
- OEX ACX6514 single MIDI fuse holder (matching SF30 holder)
- OEX ACX6505 50A MIDI bolt-on fuse (higher current rating in the same range)
- OEX 6 B&S battery cable (ACX0902L black / ACX0903L red)
- OEX distribution blocks and busbars
- ACX6503BL single-pack variant for individual replacement fuses
Frequently Asked Questions
What circuits is a 30A MIDI fuse typically used for?
A 30A rating suits mid-current circuits such as solar charge controller feeds, compressor fridge wiring, auxiliary lighting, and secondary battery charger connections. Always confirm fuse rating against your cable gauge and circuit load with a qualified auto electrician.
What does the fuse element window do?
The element window is a transparent section in the fuse body that lets you visually inspect whether the fuse element has blown without removing it from the holder — useful for quick fault diagnosis in hard-to-access locations such as battery boxes and enclosed fuse panels.
Is the ACX6503 compatible with the OEX ACX6514 MIDI fuse holder?
Yes. The ACX6503 uses the SF30 form factor and 30mm centre-to-centre bolt mounting, which is compatible with the OEX ACX6514 single MIDI fuse holder and other SF30-format MIDI holders.
What is the difference between the ACX6503 and ACX6503BL?
The ACX6503 is sold as a pack of 10 fuses, suited to workshop stock and multi-circuit builds. The ACX6503BL is the same 30A MIDI fuse sold individually as a single unit for replacement or single-circuit use.
How do I choose between the 30A ACX6503 and the 50A ACX6505?
Fuse selection depends on the continuous current draw of your specific circuit and the rating of the cable being protected. The 30A ACX6503 suits lower to mid-current circuits, while the 50A ACX6505 is suited to higher-current feeds. A qualified auto electrician can confirm the correct rating for your application.
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