The Parallax FB11 provides a separate 12V DC fuse distribution point for RV electrical systems that do not already include a suitable DC load panel. It has 11 fused branch positions and three common, non-fused positive supply terminals. This guide shows what each group does and how to distinguish an FB11 from the fuse panel included with a MagneTek 6345 converter upgrade.
FB11 12V power distribution at a glance
12V positive distribution
Circuits shown as numbers only; actual fuse ratings are determined by each connected circuit, not by its position in this illustration.
12V negative return
The FB11 distributes and protects branch circuits. It is not a battery charger or an AC shore-power breaker panel.
FB11 fuse, wire and enclosure details
| Part of assembly | What it does | Selection detail |
|---|---|---|
| 11 DC fuse positions | Individually protect 12V branch circuits | Standard blade-style fuses; 20A DC maximum per branch position, subject to the connected circuit's permitted fuse rating |
| Three common positive terminals | Accept appropriately protected converter/battery positive connections | Non-fused terminals; manufacturer's FB-series guidance lists 2–14 AWG conductors |
| Branch-circuit terminals | Connect the load-side positive wiring | FB-series terminal range is 12–16 AWG; wiring and fuses must be sized together |
| Negative terminal bar | Provides separate low-voltage return connections | Never treat the negative bar as a fourth positive supply terminal |
| Metal chassis and hinged lid | Encloses the DC circuit positions | FB11 product listing specifies that fuses are not included and there is no fuse-failure status indicator |
FB11 versus the 6345RU fuse panel
The FB11 is a separate fuse-distribution product for a suitable system without a built-in panel. The Parallax 6345RU is a converter upgrade for a MagneTek/B-W 6345 and comes with the required replacement DC distribution board, including blown-fuse indication. Matching 11 positions alone does not establish that their boards can be exchanged.
FB11 panel and related converter product photos
Start with the FB11's own listing. The 4445 and 4455 are separate deckmount converter examples; any combination requires the proper DC distribution and wiring design. The 6345RU is shown to clarify the different retrofit kit, not as an FB11 substitute.
Parallax manufacturer information
See the manufacturer's FB-series fuse-panel overview for common supply terminals and branch limits, plus specifications for the 4445 converter, 4455 converter and 6345RU upgrade.