AllSpark Circuit Breakers - Surface Mount 300A

AllSpark Circuit Breakers - Surface Mount 300A AllSpark

AllSpark Circuit Breakers - Surface Mount 300A

SKU AS-CB300SM

$69.00

Operating temperature: −32°C to +85°C

All specifications

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Questions? for expert advice, or read our buying guides

Key features

300A rating, manual push-to-trip and hand reset with no consumable fuse element
Surface mount on an F-style base
IP67 sealed for high-moisture and marine environments
Ignition protected for use where fuel vapour may be present
Terminates on 3/8-16 threaded studs — minimum 000 B&S cable, 95mm lug with a 10mm hole
Rated 12–48V DC with 3000A interrupt capacity at 30V DC
DC only — never fit to a 240V AC circuit
Certified to ABYC E-11 and SAE J1171 External Ignition Protection, and SAE J553

Overview

A 300A manual-reset circuit breaker for 12–48V DC systems, sized for battery-to-busbar main feeds and large inverter runs. It resets by hand, so a fault costs you a button press rather than a spare fuse you did not pack.

The F-style base mounts on the surface, the body seals to IP67, and it is ignition protected — so it can live in an engine bay or battery box where fuel vapour is a possibility. The push button opens the circuit on demand for isolation; resetting is a separate, deliberate action. Size the cable to the breaker, not to today's load: the breaker protects the cable, so the cable has to carry what the breaker will pass.

Common questions

Is 300A more breaker than anyone needs?

For most touring vehicles, yes. This is the top of the range and it belongs on 000 B&S cable with 95mm lugs — motorhome inverter feeds, large lithium banks, machinery. On a wagon with a fridge and a light bar it protects nothing, because the cable would fail first.

How do I support cable that heavy?

Clamp it, do not let it hang. 000 B&S has real weight, and its leverage on the 3/8-16 studs works nuts loose over corrugations. Secure the cable within a short distance either side of the breaker, bolt the base to something structural, and re-check the torque after the first long trip.

Will it clear a short on a big lithium bank?

It is rated to interrupt 3000A at 30V DC, which is the figure that matters when a large bank dumps into a dead short. Mount it as close to the battery terminal as the cable allows — the length between the battery and the breaker is the part nothing protects.

Delivery, returns & warranty

Shipping & Returns

Shipping

Outdoor Camping Australia operates a nationwide distribution network, with items shipping from:

Our warehouse in Bendigo, Victoria
Partner supplier warehouses on the East Coast
Partner supplier warehouses on the West Coast

This multi-location approach allows us to provide efficient delivery across Australia. Use our shipping calculator on the product pages for accurate delivery times and costs to your location.

Important Shipping Notes:

We cannot deliver to PO Boxes, Private Mail Bags or Parcel Lockers
Depot pickup options may be available at reduced rates (contact us to discuss)
Off-mainland deliveries require additional shipping fees (custom quoted)
Missed deliveries may incur a redelivery fee set by the courier
All shipments managed through our trusted delivery partners including Border Express, VicTas, DHL, StarTrack, AusPost, Sendle and Aramex

Returns

As outlined in our Refund Policy, we follow the Australian Consumer Law (ACL) which protects consumers by providing certain guaranteed rights when buying goods and services.

You can return items if:

The product is faulty or not of merchantable quality
The product is not fit for its intended purpose
The product does not match the description
You can present proof of purchase

For change of mind returns:

Item must be in original condition with tags attached
Must be returned within 30 days of purchase
Original proof of purchase required
Return shipping is at customer's expense
Original delivery charges are non-refundable unless due to our error

Refunds will be processed within 10 business days of receiving and inspecting the return.

For full details, please refer to our:

Warranty Details

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Warranty & Returns

Limited 12 Month Manufacturer Warranty

If you experience issues with your gear, please contact us for support.

What’s Covered?

Manufacturing defects
Faults in materials or workmanship

What’s Not Covered?

Damage caused by misuse, neglect, or improper use
Incidents occurring during delivery
Normal wear and tear from usage

How to Initiate a Warranty Claim

If you need to file a warranty claim, please follow these steps:

Contact us via email or the via the contact us
Provide the following details:
- Order ID
- Detailed description of the issue
- Images/videos clearly showcasing the fault (ensure they meet the recommended format and size for optimal review)
Our team will assess your claim and get back to you as soon as possible.

Note: Do not open a PayPal dispute, as this may delay the resolution process. Please follow the official claim process for quicker results.

⚠ Important Note:
We recommend testing your purchased product within one year of purchase. We cannot help process warranty claims beyond this period.

For full details, please refer to our other policies:

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Specifications

Rating	300A
Mounting	Surface mount (F-style base)
Termination stud	3/8-16 threaded
Minimum cable size	000 B&S
Lug	95mm
Cable lug hole	10mm
Voltage range	12–48V DC
Interrupt rating	3000A @ 30V DC
Operating temperature	−32°C to +85°C
Storage temperature	−34°C to +149°C
IP rating	IP67
Materials	Black UL 94V-0 rated thermoset plastic
Torque rating	50 in-lbs (5.6 N•m) max
Certification	ABYC E-11, SAE J1171 External Ignition Protection, SAE J553
Warranty	5 year manufacturer warranty
In the box	1 × AllSpark 300A surface-mount circuit breaker
Range available	20A, 25A, 30A, 40A, 50A, 60A, 70A, 80A, 100A, 120A, 150A, 175A, 200A, 250A, 300A