Fuse Trucks; Installing Fuse Trucks; Dsl-206 Breaker Front View (Dsl-416 Similar); Dsl-416 Breaker Side View - Eaton DS-206S series Instructions Manual

Instruction Booklet IB 33-790-1J
Effective November 2010
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).
Fig. 79 DSL-416 Breaker Side View.
70
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Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL

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.