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Product features
OEX ACX3212 300A Single Rail Distribution Block 4x M10 Stainless Steel Terminals Tin Plated Copper Bus Black 48V DC
The OEX ACX3212 is a 300A single-rail distribution block in black, featuring four M10 stainless steel stud terminals on a tin plated copper bus bar, with a nylon base and clear protective cover. Unlike the combined red/black bus bar boxes (ACX3160, ACX3162), this is a single-polarity block all four terminals share one common bus, suited to use as a dedicated negative/earth distribution rail or a positive supply rail where a single-polarity block is preferred. Rated at 300A continuous and up to 48V DC, it suits 12V, 24V and 48V DC systems. Covered by a one year warranty.
Product overview
A distribution block distributes one polarity across multiple circuits from a single common bus all four terminals connect together, making this suited to either a positive supply rail or a dedicated negative/earth distribution rail, but not both simultaneously. Where both polarities are needed in a single unit, the ACX3160 (400A, 8 studs) or ACX3162 (600A, 4 studs) combined bus bar boxes are the appropriate alternative.
The 300A continuous rating sits between the ACX3160 (400A) and the 150A distribution blocks (ACX3210/ACX3211), suited to main earth return distribution, positive supply rails for medium-high-current installations and solar, inverter and lithium battery system distribution panels. Tin plated copper bus provides low-resistance current distribution across all four terminals. M10 stainless steel studs and nuts resist corrosion in underbonnet, marine and caravan environments. The clear cover protects the bus and terminals from accidental contact, dust and moisture while allowing visual inspection without removal.
Features and benefits
300A maximum continuous rating: High-current single-rail distribution for dedicated positive or negative/earth rails. Total combined current across all four terminals must not exceed 300A.
4x M10 stainless steel stud terminals: Accepts M10-compatible ring terminals (10.5mm ID or larger). Stainless steel studs and nuts for long-term corrosion resistance.
Single-rail configuration: All four terminals share one common bus. Suited to a dedicated positive or negative distribution rail. Not configured for simultaneous positive and negative use.
Tin plated copper bus: Low-resistance current distribution across all four terminals for efficient power transfer.
Nylon base with clear cover: Electrically insulating nylon base. Clear cover protects terminals from accidental contact, dust and moisture while allowing visual inspection without removal.
48V DC maximum operating voltage: Compatible with 12V, 24V and 48V DC systems including lithium battery banks and solar storage installations.
Black: Standard colour for negative/earth distribution per automotive convention. Can also be used for positive supply distribution as a standalone single-polarity rail.
One year warranty: Covered by a one year OEX warranty.
Technical specs
| Specification | Detail |
|---|---|
| SKU | ACX3212 |
| Brand | OEX |
| Type | Distribution Block |
| Colour | Black |
| Maximum Continuous Current | 300A |
| Maximum Operating Voltage | 48V DC |
| Number of Terminals | 4 |
| Terminal Stud Size | M10 |
| Terminal Material | Stainless steel |
| Hardware | Stainless steel nuts |
| Bus Material | Tin plated copper |
| Base Material | Nylon |
| Cover | Clear |
| Pack Quantity | 1 |
| Warranty | One year |
| Sold As | Single unit |
Goes well with
OEX ACX3057, Ring Crimp Terminal 10.5mm ID Blue, suits M10 stud, pack of 100
OEX ACX3057BL, Ring Crimp Terminal 10.5mm ID Blue, suits M10 stud, pack of 14
OEX ACX3160, 400A Combined Red/Black Bus Bar Box (combined positive and negative distribution)
OEX ACX3145BL, 250A Single Stud Terminal M8 Red (positive supply counterpart)
Frequently asked questions
What is the difference between a distribution block and a bus bar box? A distribution block is a single-rail unit where all terminals connect to the same common bus, distributing one polarity across multiple circuits. A bus bar box such as the ACX3160 or ACX3162 combines both a red positive rail and a black negative rail in one enclosure. Select a distribution block for a dedicated single-polarity rail, and a bus bar box when both polarities are needed in one unit.
Can this block be used for both positive and negative connections simultaneously? No. All four terminals share a single common bus, so the block is wired as either a positive distribution point or a negative/earth distribution point, not both at once. For combined positive and negative distribution in one unit, the OEX ACX3160 or ACX3162 bus bar boxes are the appropriate choice.
What ring terminal size suits the M10 studs? The M10 studs are 10mm in nominal diameter and require ring terminals with a 10.5mm or larger ID hole. The OEX ACX3057 (10.5mm ID, blue, pack of 100) and ACX3057BL (pack of 14) are suitable options. Always confirm the ring terminal ID matches the stud diameter before purchasing.
What does the clear cover do? The clear cover protects the bus bar and terminal connections from accidental contact, dust and moisture while allowing visual inspection of connection quality without removal. This is useful in enclosed panel installations where periodic inspection is needed.
What is the maximum current for this block? The ACX3212 is rated at 300A maximum continuous current. The total combined current across all four terminals must not exceed this rating. For higher-current applications, the OEX ACX3160 (400A) or ACX3162 (600A) may be more appropriate.
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