Fuses and circuit protection
Blue Sea Systems MRBF terminal 300 A marine fuse
A terminal-mount fuse for the branch circuits, not a substitute for the Class-T at the bank.
Specifications and model checks
This profile identifies a brand and rating or model family. Confirm the precise variant and current datasheet; voltage, monitoring and environmental limits can vary between versions.
| Rating | 300 A |
| Type | MRBF terminal fuse |
| Interrupt rating | 10,000 A at 14 V DC |
| Fits | Directly on a battery terminal |
Suitable boat applications
Protecting individual charge sources and feeds close to the battery.
Compatibility limits to check
You are considering it as the main bank fuse — its interrupt rating is not the Class-T's.
For how to size this against your own boat rather than against a spec sheet, read fuses and circuit protection.
Sized for your boat
400 A
Fuse rating for a 400 Ah bank
A starting point, not a specification. The correct fuse rating comes from the cable you actually run and its length, not from the bank alone. Have a suitably qualified person check the design against AS/NZS 3004.2 and the licensing rules that apply to your vessel and jurisdiction.
Closest rating we list
Before choosing Blue Sea Systems MRBF terminal 300 A
Fuse interrupt ratings and cable protection
A fuse or switch is selected for its role in the actual circuit. Physical fit and the printed current rating do not establish suitability for the available fault current, voltage or connected cable. Ask for the protection schedule in the final system documents and obtain the exact approved spare part numbers before remote travel.
Confirm specifications against the exact model and revision offered by the supplier. A listed price band is a planning reference; request a current written quote with installation and commissioning separated from equipment supply.
Compared with
The rest of the category
| Product | Fuse rating | Price band |
|---|---|---|
| Blue Sea Systems Class-T 200 A | 200 A | $90–$150 |
| Blue Sea Systems Class-T 400 A | 400 A | $130–$210 |