Victron Busbars and Fuses: MEGA, ANL and MIDI Explained

Victron busbars and fuses are the unglamorous parts that hold a DC system together. Victron sells MIDI, MEGA and ANL fuses with matching holders, plus covered busbars rated from 150A to 600A. The key detail most people miss is the fuse’s voltage rating. Here’s what Victron’s datasheets list and how to pick the right parts.

Victron Busbars and Fuses: Fuse Ranges

Fuse type	Voltage rating	Current ratings
MIDI	32V	60, 80, 100, 125, 150, 200A
MIDI	58V	30, 40, 50, 60, 80, 100A
MEGA	32V	60A to 500A
MEGA	58V	125, 200, 250, 300A
MEGA	80V	40A to 500A
ANL	80V	300, 400, 500A

Source: Victron MIDI, MEGA and ANL fuses and fuse holders datasheet.

Victron also lists the approximate voltage drop and cold resistance for every fuse. A MEGA 200A/32V, for example, drops about 80mV with 0.25mΩ of cold resistance.

Why the Voltage Rating Matters

A 32V fuse suits 12V and 24V systems. A 48V battery can charge to more than 56V, which is above a 32V rating, so a 48V system needs 58V or 80V fuses. Victron makes 58V and 80V MIDI and MEGA versions for exactly this.

Busbars

Victron’s busbar range includes 150A, 250A and 600A models, in 2-, 4- and 6-terminal versions, many with covers. Victron’s datasheet for the 250A 4P and 6P busbar lists:

250A max current, 70V DC max voltage.
M8 (5/16″) stainless studs, tin-plated copper nuts, torqued to 13Nm.
Tin-plated copper strip, 5 × 24mm.
ABS base rated UL 94 V-0, with a cover.

For bigger systems, Victron’s Lynx Distribution system combines busbars, fusing and monitoring in one modular unit.

How to Choose

Size the fuse to protect the cable, following the device manual’s recommended fuse and the cable’s ampacity.
Check the voltage rating against the highest charge voltage, not the nominal voltage.
Pick the format: MIDI for small branch circuits, MEGA for mid to high current in a compact holder, ANL for large mains.
Size the busbar above the total current it will carry.
Lithium banks: many battery makers call for a main fuse with a high interrupt rating, such as Class-T, close to the battery. Check your battery manual.

Good to Know Before You Buy

MEGA and ANL fuses are slower to change than plug-in fuses, and their holders take up panel space. The busbars have no built-in fusing.

You can download the fuses and fuse holders manual and datasheet from Victron Energy’s website.

Full specifications for the busbars are on Victron’s product page.

Worked Example: A 12V Van Distribution Layout

A 12V van with a 200Ah lithium battery, a MultiPlus-II 12/3000, a SmartSolar MPPT 100/30, an Orion XS 12/12-50A and a DC fuse box for lights and the fridge:

Main fuse at the battery: a high-interrupt main fuse sized to protect the main cable, as the battery maker specifies.
Positive busbar: a 250A or 600A busbar collecting every positive feed, depending on total current.
Inverter branch: a 400A MEGA 32V fuse, matching the 400A DC fuse that Victron’s MultiPlus-II 12/3000 manual recommends.
MPPT branch: a 40A MIDI or MEGA fuse sized to the MPPT’s cable and output (example sizing; follow the manual).
Orion XS branch: a fuse sized to the 50A output cable, from the Orion XS manual.
DC fuse box feed: a MIDI fuse sized to the feed cable.
Negative busbar: all negatives return through a shunt to the battery.

Each branch fuse sits at the busbar end of its cable, so a fault anywhere along that cable is protected.

Worked Example: A 48V Cabin

A 48V cabin system can charge above 56V. That rules out 32V fuses everywhere on the DC side:

MIDI 58V fuses (30A to 100A) for MPPT outputs and small DC loads.
MEGA 58V fuses (125A to 300A) or MEGA 80V fuses for the inverter feed.
ANL 80V fuses (300A to 500A) where a larger main or inverter fuse is needed.

At 48V, the same power needs a quarter of the 12V current, so many 48V branches use smaller fuse values than a comparable 12V build.

Worked Example: Fuse Voltage Drop as Heat

Victron’s datasheet lists about 80mV of drop for a MEGA 200A/32V fuse. At a full 200A, that’s 0.08V × 200A = 16W of heat in the fuse itself (estimate). At a typical 50A, it falls to around 1W, because the loss scales with current squared (estimate). That’s normal, but it’s why fuse holders need clean, tight connections and some airflow.

Installation Tips

Torque every stud to the datasheet figure, like 13Nm on the 250A busbar.
Use crimped lugs that match the stud size, M8 on the 250A busbar, and the cable gauge.
Keep washers and nuts in the order the datasheet shows, with the lug against the busbar.
Fit the covers. They protect against tools or loose items bridging terminals.
Label each fuse with its circuit and rating.
Keep spare fuses of each value in the vehicle or boat.

MIDI vs MEGA vs ANL at a Glance

Format	Typical use	Strength
—	—	—
MIDI	Branch circuits, chargers, DC loads	Compact holder, lower currents
MEGA	Inverter feeds, mid-to-high current	Wide range in a small footprint
ANL	Large mains and inverter feeds	High currents at 80V

When to Choose a Lynx System

Once a build has several high-current branches, a Lynx Distributor gives you a busbar with four MEGA fuse positions in one covered unit. The Lynx Power In adds a plain busbar, and the Lynx Smart BMS and Lynx Shunt add battery management or monitoring to the same modular strip. It takes more space up front, but makes later changes tidy.

Spares Kit

Carry at least one spare of each fuse value in your system, plus a spare busbar nut and a small torque wrench or the right socket. On a boat or in a remote van, that turns a blown fuse into a five-minute fix.

FAQ

Can I use a 32V MEGA fuse on 48V?

No. Use a 58V or 80V version.

What torque for Victron busbar studs?

13Nm (110 lbf·in) for the 250A busbar, per the datasheet.

Where should a fuse go?

As close as practical to the power source end of the cable it protects, usually the battery or busbar.

Can a busbar carry more than its rating if the cables are thick?

No. The busbar’s rating is its own limit. Choose one rated above the total current it carries.

Do I need a fuse on the negative side?

Normally the fuses go on the positive side, and the negative goes through a shunt to the battery. Follow your device and battery manuals.

Sources: Victron MIDI, MEGA and ANL fuses and fuse holders datasheet; Busbar 250A 4P and 6P datasheet; busbar and fuse product pages, victronenergy.com, accessed Oct 2026.