Projecta IFB-250 Fuse Box with 250A ANL Fuse

Projecta IFB-250 Heavy-Duty Fuse Box with 250A ANL Fuse

A heavy-duty ANL fuse box from Projecta, the IFB-250 provides overcurrent protection for high-power inverter installations and high-current DC circuits, designed for placement in the positive DC line close to the battery to protect the cable from fire risk during a short circuit.

Product overview

Projecta IFB-250 Fuse Box delivers overcurrent protection for high-power inverter installations and high-current DC circuits, helping prevent cable fires and equipment damage. The ANL fuse holder with included 250A fuse protects the positive DC line between battery and inverter, interrupting current flow during a short circuit before the cable can overheat.

The 250A rating suits high-power inverter installations up to approximately 3000W continuous power, ideal for powering household appliances, air conditioners, microwaves, power tools, and multiple simultaneous loads in caravans and motorhomes. It also protects other high-current DC circuits including high-output DC-DC chargers, solar charge controllers, high-power amplifiers, and auxiliary battery systems.

Recommended installation is close to the battery, within 450mm maximum, using an appropriate cable gauge for 250A continuous current, typically 00 AWG (70mm²) or larger copper cable. The transparent cover allows the fuse condition to be visually inspected without disassembly, and brass terminals provide a reliable, corrosion-resistant connection.

Features and benefits

Heavy-duty ANL fuse holder with 250A fuse: Provides immediate overcurrent protection using the industry-standard ANL format, suited to high-power inverters up to approximately 3000W continuous power.

Fire prevention safety component: Interrupts current during a short circuit, helping prevent the cable from overheating and reducing fire risk.

Installs in the positive DC line close to the battery: Designed for placement within 450mm of the battery terminal, protecting the maximum length of cable.

Time-delay ANL fuse technology: Prevents nuisance tripping during inverter startup surge while providing fast interruption during sustained overload or short circuit.

Transparent cover with visual inspection: Allows the fuse condition to be checked without disassembly, simplifying troubleshooting.

Brass terminals: Provides a reliable, corrosion-resistant connection suited to vibration and moisture exposure in automotive and marine environments.

Suitable for high-power inverters up to 3000W: Provides appropriate protection for larger inverter installations without nuisance tripping during normal operation.

Robust automotive and marine construction: Built to withstand vibration, temperature extremes, moisture, and corrosion for permanent vehicle, caravan, or boat installation.

Technical specs

Compatible with

The IFB-250 is compatible with DC electrical systems requiring high current circuit protection, including high-power inverter installations up to approximately 3000W, DC-DC charger protection, solar charge controllers, high-power amplifiers, and other high-current accessory circuits. Suited to caravans, motorhomes, 4WD vehicles, and boats. A replacement ANL fuse is available separately as the Projecta IF-250.

Frequently asked questions

Where should the IFB-250 be installed in a high-power inverter setup?
Install in the positive DC line between the battery positive terminal and the inverter positive input, as close to the battery as practical, within 450mm maximum. Use an appropriate cable gauge, typically 00 AWG (70mm²) or larger for 250A applications. It should not be installed in the negative line.

How do I know if 250A is the right fuse rating for my inverter?
The 250A rating suits inverters up to approximately 3000W continuous power. Larger inverters above this rating require a higher-rated fuse. Confirm the correct rating for your specific inverter with us before installation.

Can the IFB-250 be used instead of a circuit breaker?
An ANL fuse provides equivalent overcurrent protection to a circuit breaker for high-power inverter applications. A fuse is typically lower cost and simpler to install, while a circuit breaker offers resettable operation without a replacement part.

What happens when the fuse blows and how do I replace it?
A blown fuse interrupts power to the inverter. To replace it, disconnect the battery negative terminal, remove the fuse box cover, replace the blown fuse with a genuine 250A ANL fuse such as the Projecta IF-250, then reassemble and reconnect the battery. Investigate the cause of the fault before restoring power.

Do I need to add a fuse if my high-power inverter didn't come with one?
Yes. Proper fusing is an important safety component that helps protect the cable from overheating during a short circuit. Many inverters are sold without external fusing, expecting the installer to provide appropriate protection between the battery and the inverter.