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Miniature Circuit Breakers
(lower Rating) |
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GENERAL DESCRIPTION |
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Abrol Engineering Company Pvt. Ltd. (AECO) is a renowned
name in electrical protection for nearly four decades. We are now proud to
announce the introduction of MCBs in current ratings of 0.5 Amps, upto 63
Amps. from 1 upto 4 poles. These MCBs are manufactured with the latest
state-of-the-art production and testing techniques Whatever may be the
application, AECO offers a perfect MCB for overload and short circuit
protection. These MCBs meet international standards on all counts. They are
designed for and conform to many national and international specifications
including ISI, lEG, CEE, NBN, VDE, BS and AS. A truly outstanding range from
a group with an international reputation for high quality and technical
innovation. |
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FEATURES |
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Rated current from 0.5 Amps to 63 Amps available in B, C & D
.characteristics as per IS:8828 -1996 & lEG Pub 898 -1995. |
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Line terminals are
designed to take simultaneously incoming cable and the busbar so that cable
clamps on busbars are eliminated. |
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Mounting by a two
stop location clip which allows easy adjustment while assembly on the DIN
Rail. |
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Very safe to
install and use: Incorporates built-in shrouds to prevent finger contact
with terminals. |
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Box' type terminals with serrated terminal clamps for firm grip on
conductors. Line terminals can take upto 35sq. mm and load terminals upto
25sq. mm copper or aluminium cables directly. |
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Quick snap-on mounting on standard 35mm top hat DIN-rail. Din-rail clips are
of unique locking design. Hence there is no ' need to hold clip continuously
for disengaging MCB from DIN rail. This allows removal of a number of MCBs
from distribution board with one hand. |
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Low let through
energy due to extremely efficient current limiting action. |
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DIN-rail clip is
provided on the bottom side of MCB-MCB remains on the DIN-rail even when
clips are pushed back (passive position). |
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Incorporates a
'recess' on the incoming side for direct mounting of busbars. The busbar is
accomodated within the height of the MCB, minimising distribution board
space. |
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Modular, sleek and
symmetric design. Multipoles are coupled together with innovatively designed
spring clips, avoiding long rivets which may result in short circuits. |
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High reliability
due to minimum number of mechanical components. |
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Padlocking facility
in ON -OFF positions. |
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Extremely smooth
operation due to use of self lubricating high performance engineering
thermoplastics. |
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Comprehensive range
with thermomagnetic release for overload and short circuit protection. |
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Fast acting light
weight mechanism. |
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Suitable for
domestic, commercial and industrial installations. |
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'High breaking
capacity- 1 OkA to IS:8828 -1996. |
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Positive contact
indication. |
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Terminals are
provided with captive screws. |
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DESIGN ADVANTAGES |
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Current limiting
design |
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Silver Graphite
Contacts (Innovative contacts metallurgy employed) |
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During short-circuit current breaking of 1 akA, ffi8 MCB
does not allow such high current to pass through it. Current reversal
produces repelling magnetic field and introduces high resistance in circuit
to limit the current to values between 2.5 to 3kA breaking current. This
reduces the let through energy (I't) and opening time, and results in low
arcing and effective arc- quenching. Forced magnetic opening due to the
reversal of current between the fixed and the moving contact further
accelerates in quicker opening time. |
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Contact bounce, when making high short-circuit currents,
results in contact welding in pure silver or ordinary silver alloy contacts.
The contacts in AECO MCBs are tipped with silver graphite, a non melting
sintered material.
The possibility of arc-erosion is also eliminated since
the fibre like graphite grain alignment is perpendicular to the movement of
the arc. Hence the contact life increases manifold. No thermally stable
oxides are formed during arcing and hence contact resistance also remains
low. |
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Housing |
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Trip Free Mechanism |
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The body of AECO MCB is made of flame retardant high
strength plastic which has a high melting point, low water absorption at
saturation, high dielectric strength, high deflection temperature under load
and low co-efficient of linear thermal expansion. |
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The tripping of the MCB is independent of the position of
the knob, that is to say that while the operating knob may be held in the ON
position, the MCB will still open in the event of a fault. |
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Padlocking/Sealing
Arrangement |
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Special Vents |
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Padlocking/Sealing arrangement is possible in both ON and
OFF positions. This eliminates the hazards of closing when personnel are
working on circuits as well as the nuisance of manual tripping when it is
unnecessary. |
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The vents in AECO MCBs
are so designed that they prevent any ingress of dust. The chances of dust
settlement on the contacts are reduced and dust free perfect electrical
contact is made. Hot gases produced are diverted away from the operating
personnel during short-circuit arc breaking. |
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