1.8. 33-790-11
circuit before the blown limiter is replaced, the breaker
will be immediately reopened and held trip-free. The
solenoids are isolated from the primary circuit voltage by
three transformers located above the limiters. See Fig-
ures 77 and
79.
Fig.
78
DSL-206 Breaker Front View
(DSL-416 Similar)(388445)
Fig.
79
DSL-416 Breaker Side View (391073)
Effective October 1998
Page 69
9.3 FUSE TRUCKS
DS-3200 and DS-4000 Fuse Trucks provide drawout
mounting for Class L current limiting fuses when installed
in
type DS switchgear. These drawout trucks physically
fit
in
the same compartments as the DS-632 and DS-840
circuit breakers respectively. They are moved
in
and out
of
the compartment using a similar levering mechanism
as provided on the DS circuit breakers. See Figures
81
and 82.
9.3.1 Installing Fuse Trucks
The fuse truck is normally installed in series with a circuit
breaker
of
the same current rating. When this is done the
fuse truck should be
in
the circuit ahead
of
the circuit
breaker in order to provide maximum protection
of
the
equipment. The fuse truck must never be permitted to
close the current circuit
or
to open it when levering the
truck
in
or out
of
the cell, because the primary disconnect
contacts are not designed for this service. For this reason
a key interlocking system is always provided which pre-
vents opening
of
the fuse truck
door
unless the associ-
ated circuit breaker has been opened, pulled out and
held
in
essential disconnected position. This key interlock
is installed on the
door
of
the fuse truck compartment, not
on the fuse truck itself.
Courtesy of NationalSwitchgear.com
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