Product Center

Home / Product Category / Insulator / High-voltage Disconnector / Drop-out Fuse Cutout

Drop-out Fuse Cutout

Drop-out fuse cutout is an outdoor expulsion-type protection device used in overhead distribution networks to protect transformers, capacitor banks, cables, and feeder lines from overloads and fault currents. Covered by IEC 60282-2 for AC systems above 1,000 V, it serves as a compact pole-mounted isolation and protection point: the fuse link carries normal current and operates during faults, causing the holder to drop open for easy isolation and maintenance. It is commonly available in voltage classes from 4.16 kV to 34.5 kV, with porcelain or polymer insulation, flexible mounting and connector options, and compatibility with loadbreak tools in certain designs.

Quantity:
Availability:





Inquire Add to Basket

Product Accessories

Mounting brackets such as NEMA Type B, extended, or D-shape styles are commonly offered to match different pole-top installation needs.

Connector options such as parallel-groove connectors and eye-bolt connectors are available on selected cutout families to simplify line connection and field interchange.

Fuse links and fuse tubes are core accessories, with some published designs using removable buttonhead fuse links and interchangeable fuseholder constructions.

Loadbreak tool compatibility is available on selected cutouts, including units equipped with hooks for the portable loadbreak tool.

Cutout-arrester combination units are also offered by major manufacturers for locations that need both overcurrent and surge protection in one compact assembly.

Get a Quote

Product Specifications

Product type

Outdoor expulsion drop-out fuse cutout.

Installation style

Single-pole, pole-top, overhead distribution mounting.

Voltage class range

4.16 kV to 34.5 kV family coverage in published utility cutout lines.

Common nominal voltage classes

14.4/15 kV, 25/27 kV, and 34.5 kV class configurations.

Continuous current rating

100 A and 200 A fused versions are commonly published; 300 A disconnect blade options appear in some interchangeable cutout families.

Interrupting rating

up to 16,000 A asymmetrical in published Type XS ratings, with model-dependent 10,000 A and 12,000 A options also shown.

Basic insulation level (BIL)

110 kV, 125 kV, 150 kV, and 170 kV depending on voltage class.

Insulator material

Porcelain and polymer designs are both available in major cutout families.

Fuseholder / operating compatibility

Removable buttonhead fuse links are used on some designs, and selected cutouts are compatible with load switching.

Standards / design basis

IEC 60282-2 for expulsion fuses, with IEEE C37.41 test basis cited by major manufacturers; ISO 9001 quality systems are also noted in manufacturer literature.

Product Applications

Economy is more affordable

on overhead feeders, where fast fault isolation is needed right at the transformer primary.

Pole-mounted distribution transformers
on solidly grounded systems, especially where dependable clearing and sectionalizing are required.

Grounded-wye capacitor banks
on solidly grounded 26.4 kV to 34.5 kV systems.

Single-phase-to-neutral overhead lines and transformer taps
that need compact, pole-top overcurrent protection close to the protected section.

Overhead distribution cables and feeder laterals

Product Advantages

Clear fault isolation

the dropout action gives crews a practical way to identify and isolate a faulted section after operation.

Field-friendly handling

manufacturer literature highlights easy fuse link installation, easy fuse tube insertion/removal, and reliable closing behavior even in adverse weather.

Stronger protection package

single venting down and away, Loadbuster® compatibility on selected designs, and broad voltage/current coverage make the cutout a flexible utility protection solution.

WellDone Drop-out Fuse Cutout Plan Drawing

FAQ

What does a Drop-out Fuse Cutout do?

It protects distribution equipment from overcurrent and fault conditions.
How is it operated?

The fuse link opens during a fault, and the tube drops to show the circuit is isolated.
Where is it used?

It is mainly used on overhead pole-mounted distribution lines and transformers.