BUSSMANN

The BUSSMANN KAC series consists of fast-acting, bolt-on fuses rated for AC-only circuits, such as the KAC-70 (70 A, 600 V AC). They are designed for semiconductor protection where bolt-on mounting is required. The FWC series, such as the FWC-32A10F, are fast-acting cylindrical fuses rated for both AC and DC circuits (e.g., 32 A, 600 V AC, 700 V DC). The FWC series is typically used in applications requiring compact cylindrical fuses with DC capability, while the KAC series is suited for AC-only bolt-on installations. Both provide overcurrent protection for power semiconductors, but selection depends on mounting style and voltage type.

BUSSMANN FNQ-R series fuses are time-delay cylindrical fuses with a dual-element design. They are rated for 600 V AC and available in various current ratings, such as 1.3 A (FNQ-R-1-3/10). The fuses have a melamine body and dimensions of 13/32 in x 1 1/2 in. They are non-indicating and compatible with HEB fuse blocks. The time-delay characteristic allows them to withstand temporary inrush currents without opening, making them suitable for control circuits and inductive loads. Always verify the specific part number for exact ratings and certifications.

The BUSSMANN FP-4 fuse puller is designed for cartridge fuses with diameters from 1 3/4 in to 2 1/2 in and current ratings from 225 A to 600 A. It is insulated and has a length of 2 1/2 in. This tool allows safe removal and installation of large cartridge fuses. Note that it is not rated for use with Class J fuses. For other current ranges, the FP-3 (70 A to 200 A), FP-2 (1 A to 60 A), and FP-6 (0 A to 60 A) are available. Always match the puller to the fuse size and type to ensure proper fit and safety.

Yes, some BUSSMANN fuse series are rated for DC applications. For example, the FWC series cylindrical fuses are rated for both AC and DC, with models like FWC-32A10F rated 600 V AC and 700 V DC. These are suitable for protecting power semiconductors in DC circuits, such as those found in industrial drives and power supplies. However, not all BUSSMANN fuses carry DC ratings; the KAC series, for instance, is AC-only. When selecting a fuse for DC circuits, verify the DC voltage rating and time-current characteristics to ensure proper protection. Consult the datasheet for specific part numbers.

The dual-element design in BUSSMANN FNQ-R series fuses combines a time-delay element and a fast-acting element. This allows the fuse to withstand temporary overloads, such as motor starting currents, without opening, while still providing rapid protection against short circuits. The time-delay element is typically a spring-loaded solder joint that melts under sustained overload, while the fast-acting element clears high fault currents. This makes FNQ-R fuses suitable for circuits with inductive loads, like control transformers and solenoids, where inrush currents are common. The dual-element construction helps prevent nuisance openings while maintaining reliable overcurrent protection.

BUSSMANN fuse pullers are insulated tools designed for safe removal and installation of cartridge fuses. However, they are not a substitute for proper lockout/tagout procedures. The insulation provides protection against accidental contact with live parts, but the pullers themselves are not rated for direct contact with live circuits. Always de-energize the circuit before removing or installing fuses, and follow established electrical safety practices. The pullers are intended to facilitate handling of fuses in de-energized panels, reducing the risk of burns or mechanical injury. Refer to the specific puller's specifications for voltage ratings and limitations.