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Description
I n addition to the performance achieved by combining
the MCCB and LVPCB technologies, several 1nstallat1on,
operation, and safety features have been incorporated
into the SB breakers.
Insulated - Encased Construction
The SB breaker's housing, internal barrier, and front cover
are molded from a thermoset material with a high-dielectric
strength (electrical i nsulation). The one piece mol
(base and housing) provides enhanced structural 1ntegnty.
A midbarrier provides outer wall reinforcement, Integral
arc baffling, and i nsulation/isolation between the two com
partments of the circuit breaker. This patented construction
has allowed for a higher interrupting capac1ty w1th1n a
smaller size than could have been achieved by more con-
800 A SB Enc ase d Sys tem s Bre ake r Pict ure d Abo ve (Ph
4
ventional construction . The electrical insulation property of
the thermoset material enhances the safety of operation .
The insulated case physically isolates and electrically
insulates the user from the internal high voltage contacts .
The arc chambers and main contact structure are encased
in the back compartment. The trip unit, controls, springs of
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the stored energy mechanism, and optional internal ac
cessories are located i n the front compartment. Access
ed case
to the front compartment is by the removable front cover.
Since the barrier between the two compartments is made
from the same insulating thermoset material as the hous
ing, the user is physically isolated and electrically insulated
from the main breaker mechanism and contacts when the
front cover is removed.
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