Instructions for Installation, Operation and Maintenance of Low Voltage Power Circuit Breakers Types DSII and DSLII
● GENERAL INFORMATION
▲ Type DSII and DSLII Power Circuit Breakers are horizontal dra-wout magnetic air circuit breakers utilizing an electronic tripping system. They are designed for use in metal enclosed switchgear assemblies having maximum voltages of 635 volts AC for Type DSII breakers and 600 volts AC for Type DSLII breakers. Depend-ing on the specific breaker being considered, DSII and DSLII breakers are available in frame sizes from 800 through 5000 amperes with interrupting ratings as high as 85,000 amperes rms symmetrical for Type DSII and 200,000 amperes rms sym-metrical for Type DSLII breakers. (Figure 1-1, Tables 1.1 and 1.2). The breaker nameplate provides complete rating information and all DSII breakers conform to applicable NEMA, ANSI and IEEE standards (Figure 1-2).
▲ Each DSII and DSLII breaker consists of a basic breaker as-sembly, three interrupter assemblies (arc chutes), barriers and an electronic trip unit. DSLII breakers have integrally mounted, series connected current limiters. The purpose of the current limiters is to extend the interrupting rating of the standard DSII breaker (Figure 1-3)
▲ The Type DSII breaker is a four position drawout (Connect, Test, Disconnect and Remove) design supplied with either a manually or electrically operated, two-step stored energy mechanism. This type of mechanism assures positive control at the instant of closing the main contacts.
▲ Controls and indicators are functionally grouped on the front of the breaker. The faceplate, in conjunction with a closed breaker compartment door, provides a double steel safety barrier.
▲ DSII breakers can be withdrawn on extension rails for inspec-tion, minor maintenance or a visual inspection of the inside of the breaker compartment. The captive extension rails are a permanent part of the breaker compartment (Figure 1-4)
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Types DSII 、 Types DSLII 、 DSI1-308 、 DSII-508 、 DSII-608 、 DSII-516 、 DSII-616 、 DSII-620 、 DSII-632 、 DSII-840 、 DSLII-308 、 DSLII-516 、 DSLII-620 、 DSLII-632 、 DSLII-840 、 DSIl-632 、 DSll-840 、 DSIl-850 、 DSII-FT32 、 DSlI-FT40 、 DSll-308 、 DSIl-508 、 DSIl-608 、 DSIl-516 、 DSIl-616 、 DSIl-620 、 DSII-308 |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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July 2010 |
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IB694C694-03 |
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10.8 MB |
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