ABB VD4 Installation And Operating Instructions Manual page 15

M E D I U M V O LTA G E P R O D U C T S
5.4.2 Circuit breakers for UniSec switchgear with
rh or lh lateral operating mechanisms
(230 mm distance between centers)
The coded basic version of the circuit breakers for
UniSec switchgear is the same as that of the fixed
circuit breakers, with the following specific
exceptions and equipment:
• the dustproof enclosure of the operating
mechanism is equipped with a specific side
frame for the UniSec switchgear
• the base is equipped with wheels to make the
switchgear easier to move and rack-in to the
compartment
• the wiring ends at the terminal box equipped
with a withdrawable part and can be accessed
without removing the operating mechanism's
dustproof enclosure. The terminal box is actually
situated at the front and projects over the upper
edge of the enclosure
• the front enclosure has a transparent sliding
shutter over the mechanical indicators, the
operating pushbuttons and the hand lever that
loads the closing spring. This protection
prevents hot gas from escaping if an arc forms
in the UniSec circuit breaker compartment. On
request, this shutter can be equipped with a
padlock to prevent it from sliding and thus
inhibit the opening and closing buttons from
being used
• 9 auxiliary contacts are available on request,
with a surcharge, as an alternative. Since each
shunt opening device uses an NO auxiliary
contact to shut off its power supply after having
opened the circuit breaker, there is an
unavailable NO auxiliary contact for every
opening release installed
• on request, this version can be supplied with
just the REF 601 protection device.
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