You've hit upon a common and somewhat frustrating aspect of working with very high amperage fuses. You are correct, finding dedicated "fuse blocks" for 1600A Class L fuses (and similar high-amp fuses) is extremely rare, if they exist at all.Here's a breakdown of why and what you typically do: Why no dedicated blocks? Current Density and Heat Dissipation

At these amperage levels, the primary concern is managing heat. A traditional fuse block, with its insulating material and confined spaces, can impede heat dissipation. The goal is to provide maximum surface area for cooling.

Direct Connection is Preferable

Direct connections to busbars or substantial conductor terminations minimize connection resistance, which is a major source of heat. Any intermediary block introduces more potential points of failure (resistance and heat).

Custom Installation

Installations at this scale are almost always custom engineered. The specific enclosure, busbar configuration, and conductor routing will dictate the best mounting solution. A pre-fabricated block would be restrictive.

Cost

A fuse block capable of handling 1600A would be very expensive due to the specialized materials and construction required. It's more cost-effective to design a custom solution using readily available components.

How are Class L fuses installed above, say, 800 amps?1. Busbar Mounting

This is the most common method. The fuse clips are designed to bolt directly to busbars.

Fuse Clips

You purchase fuse clips rated for the fuse size and designed for bolting onto busbars. Companies like Ferraz Shawmut (Mersen), Littelfuse, and Bussmann offer these.

Busbar Material and Size

You must size your busbars appropriately to handle the 1600A continuous current and the potential fault current. Copper or aluminum busbars are typical. Consult engineering tables for ampacity ratings based on material, size, and ambient temperature.

Enclosure

The busbar assembly and fuse are then housed in a suitable enclosure (panelboard, switchboard, or a dedicated enclosure). The enclosure must be rated for the voltage, current, and environmental conditions.2.

Direct Bolting to Lugs/Conductors

In some situations, you might bolt the fuse directly to appropriately sized lugs connected to your conductors. This is less common than busbar mounting but can be used in specific applications. Again, the main concern is proper conductor sizing, termination, and heat dissipation.3.

Custom Fabricated Mounting

For very specific installations, you might need to fabricate a custom mounting solution using copper or aluminum bar stock. This is typically done by a qualified electrical contractor or a custom metal fabricator.

Important Considerations for your 1600A Class L Installation



Engineering Design

This is not a DIY project! You need a qualified electrical engineer to design the system and specify the components. They will consider:

Fault Current

Crucially, the available fault current at the location of the fuse must be known. The fuse's interrupting rating (the maximum fault current it can safely interrupt) must be higher than the available fault current.

Coordination

The fuse must be properly coordinated with upstream and downstream protective devices.

Conductor Sizing

Conductors must be sized according to the NEC (National Electrical Code) or your applicable local codes, taking into account ampacity derating factors for ambient temperature, number of conductors in a raceway, etc.

Enclosure Selection

The enclosure must be rated for the voltage, current, environmental conditions (indoor/outdoor, temperature, humidity, etc.), and have sufficient space for the busbars, fuses, and terminations.

Heat Dissipation

You will need to ensure proper airflow and ventilation to prevent overheating.

NEC Compliance

The installation must comply with all applicable sections of the NEC and any local electrical codes.

Proper Installation Techniques

Connections must be torqued to the manufacturer's specifications. Use appropriate tools and follow best practices for electrical terminations.*

Qualified Personnel

Only qualified electricians should perform the installation and maintenance.

In summary: Don't expect to find a simple "fuse block" for a 1600A Class L fuse. You'll need to design a custom solution, most likely using busbars and appropriately rated fuse clips. Consult with a qualified electrical engineer to ensure a safe and code-compliant installation. Consider reaching out to fuse manufacturers like Mersen, Littelfuse, or Bussmann. Their application engineers can often provide guidance on proper mounting and termination techniques for their products. Flag for review