Equally important to the selection of the proper fuse is the correct selection of the proper fuseholder or fuse block for a given application. Fuseholders are available using most of the same Selection Considerations outlined for UL fuse classes.

Considerations for fuseholders include:

• Current Rating
• Voltage Rating
• Interrupting Rating
• Physical Size
• Indication

Additional selection considerations for fuseholders and fuseblocks include:

• Number of poles
• Mounting configuration
• Connector type

Current Limiting Fuses:
Class CC, Class J, High Speed Class J, Class RK, Class L, Class T

General Purpose Fuses:
Class M Midget and Small Dimension

Special Purpose Fuses:
PLC Spare Fuses and GS Drives Fuse Kits / Spare Fuses

Connector Type
For fuseblocks, a choice of three connector types or wire terminations is available:

• Screw – for use with spade lugs or ring terminals.
• Screw with Pressure Plate – for use with solid or stranded wire without terminal and recommended for applications where vibration will be a factor.
• Box Lug – the most durable of the three options and used with all types of solid wire and Class B and Class C stranded wire.

Number of Poles
The number of poles for each set of fuses is determined by the characteristics of the circuit. Most fuse block series are available in 1, 2, or 3 pole configurations, although some are also available with four or more poles. The option to gang individual fuseblocks into longer strips will be determined by the available space and type of wire being used.

Mounting Configuration
Depending on the fuse block design, another selection consideration to evaluate is how the fuseblock is mounted or inserted into the panel. Historically, fuseblocks simply screwed into the back of the panel, but many newer designs have now added (or replaced the screw-in design with) a DIN rail mounting capability. The DIN rail mounting feature allows the blocks to be quickly installed and removed from the rails.

PCB board mounting fuse holder

Panel Mount Fuse Holder

Wire harness fuse

Automobile fuse holder