Blue Sea Systems Class T Fuse - 400 Amp
SKU BLUE-5121
- Amperage
- 400A
- Maximum Voltage
- 125V DC
- Stud Size
- 190; 3/8"
- Interrupt Capacity
- 20000A @ 125V DC
- Weight
- 0.30lb (0.14 kg)
- Voltage
- 125V DC
- Function
- Class T Fuses
- Fuse Type
- Class-T
Stocked items typically ship the next business day from our US warehouse. 30-day returns on unused stocked items. Exclusions apply. Return policy · Shipping policy
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About this product
Class T Fuse - 400 Amp. Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC).
Key features
- Extremely fast short-circuit response
- 20,000 Ampere Interrupt Capacity (AIC)
For installation planning, check the manufacturer's ratings: amperage: 400A; maximum voltage: 125V DC.
Manufacturer part 5121. Confirm the circuit rating, mounting arrangement, and required accessories against the manufacturer specifications before selecting this part.
Manufacturer specifications
- Amperage
- 400A
- Maximum Voltage
- 125V DC
- Stud Size
- 190; 3/8"
- Interrupt Capacity
- 20000A @ 125V DC
- Weight
- 0.30lb (0.14 kg)
Product details
- Voltage
- 125V DC
- Function
- Class T Fuses
- Fuse Type
- Class-T
- Device Type
- Class T Fuses
- Manufacturer
- Blue Sea Systems
- Product Type
- Class T Fuses
- Voltage Rating
- 125V DC
Shipping & returns
- Stocked items typically ship the next business day from our US warehouse.
- 30-day returns on unused stocked items. Exclusions apply. See policy
- Custom and quoted items are non-returnable once production begins.
Warranty
Backed by the original manufacturer’s warranty plus our workmanship guarantee on assembled harnesses. Contact us with your invoice and we’ll coordinate any covered repair or replacement.
Read the full warranty termsTechnical support
Need help choosing the right part?
Our marine electrical team can review your setup and recommend compatible products. Send a photo, a sketch, or your circuit list and we'll come back with a parts list that fits the boat.
Certifications & training
- ABYC-aware build practices
- OEM-grade marine wire & terminals
Additional capabilities are based on hands-on experience building marine wiring systems rather than third-party certification.
Share your project
Have you used this product in a project? Send us photos of your install for consideration in our project gallery.
Why buy from Common Ground Marine
- 20+ years building marine wiring harnesses, panels, and shore-power systems.
- Engineers — not a phone tree — review every custom build before parts are cut.
- OEM-grade components: tinned copper, sealed connectors, marine-rated jackets.