Eaton SBN-508 Instructions For Installation, Operation And Maintenance

Also see for Magnum SB Series: Technical product guide

Contents

55Instructional L eaet IB2C12063H03Effective March 2012Instructions for Installation, Operation andMaintenance of Magnum SB Insulated CaseLow Voltage Power Circuit BreakersEATON CORPORATION www.eaton.comSection 4: Drawout Circuit Breaker AndCassetteGeneralSection 3 discussed topics and features common to allMagnum SB circuit breakers, no matter what the mountingconfiguration or type In this section, features unique tothe drawout type circuit breaker and drawout cassette, notcovered elsewhere, are discussed Drawings and dimensionsassociated with all circuit breakers, drawout cassettes andany appropriate primary bus connections can be found in aseparate document entitled Engineering Data TD01301004EThe installation and levering of a drawout circuit breaker werediscussed in Section 2 If necessary, review that information,since it will not be repeated hereFigure 80. Drawout Circuit Breaker in CassetteDrawout CassetteA drawout circuit breaker is used in combination with a fixeddrawout cassette (Figures 80 and 82) The drawout circuitbreaker is equipped with automatic primary disconnects(Figure 81) The cassette provides all of the necessaryinterfaces to the drawout circuit breaker including automaticprimary and secondary connections For the narrow framecircuit breaker a single cassette style using horizontal stabsand horizontal customer bus bar terminals is available (Figure83) For the standard and double-wide circuit breakers threecassette styles, all with vertical stabs, are available: basic,standard, and universal The standard cassette supplies verticalstab/terminals only (Figure 85) The basic cassette omits thecopper stab/terminals so that these pieces can be integratedwith vertical bus bars provided by the switchgear builder(Figure 84) The universal cassette provides a set of flat padterminals on the rear of the cassette that can be adapted tovertical, horizontal or front connection (Figures 86) Mountinglocations for cell (TOC) switches, safety shutters, mechanicalinterlocks and key interlocks are provided on the cassetteFigure 81. Drawout Circuit Breaker with Automatic PrimaryDisconnects