Fuses and circuit protection
Blue Sea Systems Class-T 400 A marine fuse
The size most cruising boats end up at once a 2000 W inverter is on the bus.
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 | 400 A |
| Type | Class-T |
| Interrupt rating | 20,000 A at 125 V DC |
| Fits | Bank terminal or holder |
Suitable boat applications
400 Ah and larger banks with a substantial inverter.
Compatibility limits to check
Your cable cannot carry 400 A — the fuse must protect the cable, not the battery.
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 Class-T 400 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 MRBF terminal 300 A | 300 A | $45–$80 |