Specification

and Homeline

Load Centers and Enclosures

General Information and Application Data

03/2007

Single-Phase, 12–42 Circuits, 300–400 A, Fixed Mains

UL Listed

 File E-6294

 Suitable for use as service equipment

 75 °C wire rating (see Technical Information on page 20)

Short Circuit Current Rating

 Main lugs: up to 65,000 AIR

 Main circuit breaker: 42,000 AIR fully rated (see Technical Information

on page 20)

Mains

 Factory-installed main lugs and main circuit breaker

 Multiple wire terminals for phases and neutral

 Top or bottom mains positioning (see Technical Information on

page 20)

Cover

 Flush- and surface-mount covers sold separately

Interior

 Available in single-phase construction

 Interiors accept QO

and QOB-VH 110 150 A maximum circuit

breakers (QOB-VH circuit breakers require connector kit PK3CA)

 Tin plated aluminum bus

 Tin plated copper connector fingers

 Neutral assemblies positioned opposite the mains compartment

Enclosures

 20 in. (508 mm) wide galvanized steel

 Embossed 0.25 in. (6 mm) standoffs

 End walls, one blank and one with knockouts, are standard; both are

removable and interchangeable

 Embossed keyholes centered at both ends and in visual positioning

 Multiple grounding bar mounting locations

 Wire management braces

QON42MS400 and MH68

QON42LS400 and MH53