The ASCO Model 425 Surge Protective Device is a hard-wired electrical surge protector designed to protect main distribution panels, electrical systems, and connected equipment against transient voltage surges. It uses thermally protected metal-oxide varistors (MOVs) and is suitable for specified main-disconnect line-side or load-side installations.
The ASCO Model 425 belongs to the ASCO 400 Series of surge protective devices (SPDs). It is designed for installation in electrical distribution systems to divert transient surge energy away from protected equipment.
The device features a weather-resistant NEMA Type 4X enclosure, LED status indication, and optional remote alarm contacts, depending on configuration. It was designed for commercial and industrial power distribution applications, including electrical systems supplying CCTV servers, network cabinets, security equipment, and building infrastructure.
Key Specifications
Parameter
Specification
Brand
ASCO
Series
400 Series
Model
425
Product type
Main Electrical Surge Protective Device
Operating voltage range
120–600 V AC, model-dependent
Surge capacity
Up to 100 kA per phase
Maximum surge current
50 kA per mode / 100 kA per phase
Surge protection technology
Thermally protected MOVs
Installation type
UL 1449 Type 1 or Type 2, configuration-dependent
Enclosure rating
NEMA Type 4X
Status indication
LED indicators
Remote monitoring
Optional alarm contacts
Typical installation
Main distribution panel or electrical switchboard
Product status
Discontinued
Specifications depend on the exact model suffix and voltage configuration.
Common Uses
Main electrical distribution panel surge protection.
Protection of CCTV server and network equipment power supplies.
Commercial and industrial buildings.
Security system and building infrastructure power distribution.
Electrical systems requiring transient surge suppression.