Dual MRBF Terminal Fuse Block | 30–300A, 58V DC, 5/16" (M8) Battery Stud
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SKU: 191286330:-2#30-400A;210200070:-2#58V
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Dual MRBF terminal fuse block, 30–300 A, 58 V DC, 5/16" (M8) stud. Mounts directly on the battery post and takes two MRBF (marine-rated battery fuse) elements, putting overcurrent protection within inches of the battery as ABYC E-11 requires — the standard approach for lithium banks and 24/48 V systems where 32 V ANL and MEGA fuses are not acceptable. Direct class cross for Blue Sea Systems 5191.
| Fuse type | MRBF terminal fuse, 30–300 A (fuses sold separately unless noted) |
|---|---|
| Voltage | 58 V DC |
| Interrupt rating (MRBF) | 10,000 A at 14 V DC; 2,000 A at 58 V DC |
| Stud | 5/16" (M8) battery terminal |
| Body | Tin-plated copper contacts on flame-retardant base |
Cross-reference
| Manufacturer | Part No. | Notes |
|---|---|---|
| Blue Sea Systems | 5191 | Dual MRBF Terminal Fuse Block, 5/16" stud |
| Eaton Bussmann | CBBF class | Battery terminal fuse holder family |
Where it's used
- Battery-post protection for two feeds (e.g., inverter and DC distribution) on 12–48 V banks
- LiFePO4 banks where a 10 kA interrupt rating is needed at the battery
- Solar, van, RV, and marine installs meeting the ABYC 7-inch rule without an extra enclosure
How to install
Mount on the positive post under the cable lug, torque the post nut per the battery maker, land each feed lug on its fuse stud with a serrated flange nut, and size each MRBF to the downstream wire. Fuse-family guide: DC Power Distribution for 12/24/48 V Systems.
Ships from Oxnard, CA. Volume and trade pricing through the trade desk.
Why Pros Buy Direct from Conversions Tech
Engineered in the USA. Our U.S.-based engineering team designs and specifies our core product lines, and every product we carry — designed in-house or built to our exact specifications by certified partner factories — is quality-verified before it ships. UL/CSA listed where required, NEC compliant.
Cross-reference savings. Direct equivalents to Burndy, Hubbell, and other OEM part numbers at up to 30% less — same specs, same certifications, without the big-brand markup.
Real technical support. Need a torque spec, die reference, or an OEM quote? You’ll speak directly with the Conversions Tech engineering desk — not a script reader — for instant answers, custom kitting, and private-label options.
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