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Surge Arrester

Surge arrester is a gapless metal-oxide device used in AC power systems above 1 kV to protect equipment from temporary and transient overvoltages by staying non-conductive in normal operation and diverting surge current to ground during lightning or switching events, with selection based on system voltage, continuous operating voltage, rated voltage, discharge current, protective level, and energy duty.

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Product Accessories

Line terminal / line clamp for secure conductor connection.

Bird protection cap / bird cap XL for exposed outdoor installations.

NEMA metal bracket for standard pole or structure mounting.

NEMA insulating bracket for selected voltage ranges, including versions for Ur ≤ 15 kV and Ur > 15 kV.

Silicone rubber insulating bracket for alternate mounting and creepage needs.

Transformer bracket and cross-arm bracket for transformer top or cross-arm mounting.

Ground strap and insulated line/ground lead for grounding connections.

Disconnector and visible fault features on selected distribution designs to isolate a failed arrester from the system.

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Product Specifications

Standard compliance

IEC 60099-4; many product lines are also qualified to IEEE C62.11.

Arrester type

gapless, non-linear metal-oxide resistor type.

Continuous operating voltage

Uc under IEC, MCOV under IEEE.

Rated voltage

Ur, used as the arrester reference voltage in IEC practice.

Nominal discharge current

IEC class values range from 1.5 kA to 20 kA; 5 kA is important for medium-voltage distribution, while 10 kA and 20 kA are common for higher-voltage duties.

Residual / discharge voltage

the voltage appearing across the arrester during discharge current flow; it defines the protective level.

Energy capability

expressed through line discharge class, repetitive charge transfer rating (Qrs), thermal charge transfer rating (Qth), and thermal energy rating (Wth), depending on class and standard.

Housing material

polymer, porcelain, or silicone-composite hollow-core designs are all used in current product families.

Application voltage range

manufacturer portfolios span from medium-voltage distribution duty to EHV service; published families cover roughly 3 kV up to 1,200 kV, with some ranges extending to 612 kV or more depending on the product family.

Safety / overload features

selected designs include pressure-relief behavior, short-circuit capability, disconnector options, and visible fault indication for damaged units.

Product Applications

Economy is more affordable

where the arrester is installed close to the transformer primary to clamp lightning surges before they reach the winding.

Pole-mounted distribution transformers on overhead feeders
in distribution substations and industrial plants that need protection from lightning and switching overvoltages.

Medium-voltage switchgear and feeder panels
where surge energy and insulation coordination must be controlled at the equipment terminal.

Transformer bushings and capacitor banks
where non-gapped or externally gapped line arresters are used on towers or directly on insulators to improve system reliability.

Hazardous stretches of overhead transmission or distribution lines

Product Advantages

Fast, targeted overvoltage protection

the arrester diverts surge current quickly, helping keep the protected equipment below damaging insulation stress.

Flexible construction and mounting

polymer, porcelain, hollow-core, bracketed, and disconnector-equipped versions make it easier to match different utility and industrial installations.

Better field serviceability

selected designs add visible fault indication, grounding disconnectors, and weather-resistant housings that support maintenance and replacement work.

WellDone Surge Arrester 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.