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GENERAL DESCRIPTION Page 7
The Toshiba HV6AS vacuum circuit breakers
described in this manual are suitable for use on
systems of 4.8kV and 7.2kV voltage classes
which require interrupting ratings of 16kA and
14kA respectively and a continuous current
rating of 630A. The circuit breakers are intended
for use in limited applications requiring small
physical size and low maintenance.
These breakers are designed for fixed panel
mounting and are available with upper main
circuit terminals (U, MU types) or rear terminals
(L, ML types).
The breakers are available as both manual and
motor-operated types. Motor-operated breakers
use a motor to charge the closing springs and to
close the breaker upon command. Both types
can be tripped electrically and also include
undervoltage release.
Arc interruption is accomplished inside sealed
vacuum interrupters mounted on track-resistant
insulators. Vacuum interrupters use low-surge
contact materials which exhibit low current
chopping levels reducing switching overvoltages.
Fig. 1 and Fig. 2 illustrate and identify the major
components of the circuit breakers.
COMPONENTS LEGEND:
1) Manual closing handle
2) Manual trip lever
3) On-Off indicator
4) Spring charge indicator (MU and ML only)
5) Operations counter
6) Secondary control circuit terminal block
7) Main circuit terminals
8) Auxiliary switch
9) Grounding terminal
Fig. 1 U and MU Type Circuit Breaker (Upper
Main Circuit Terminals)
Fig. 2 L and ML Type Circuit Breaker (Rear
Main Circuit Terminals)