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3. Technical informations
3.1 Introduction
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Gerapid is a high-speed DC circuit breaker. This is a sin-
gle-pole DC breaker, primarily designed for use in rail-
way propulsion-power distribution systems with operat-
ing currents up to 8000A (code nr: 1) and operating volt-
ages up to 3600V (code nr: 2). Additional application ar-
eas are special industrial plants as electrolysis plants,
mines or steel mills.
•
The breaker type Gerapid has a very high interruption
capacity combined with a current limiting characteristic.
The arc chute works on the basis of an asbestos-free arc
splitting principle.
•
A wide variety of accessories and spares are available
for maintenance, repair, or as a possible extension. The
breaker shall be configured by using PST coding sys-
tem, available at the end of this instruction or as an ex-
cel file, free of charge.
•
Closing of the circuit breaker is performed through a
high-power solenoid drive (code nr: 3).
•
During inspections, opening and closing may be carried
out by means of a hand lever (code nr: 16), which is
mounted onto the armature of the closing drive.
•
Overload tripping is obtained directly via OCT device
(code nr: 7) or, optionally by electro-dynamic coil (code
nr: 12). Indirect remote tripping can be achieved by
means of a shunt trip or exclusively, by a zero voltage
release (code nr: 11).
•
Gerapid breakers have a compact and enclosed con-
struction [Fig. 4]. They are IP 00 protected. All parts are
mounted on thick-walled, non-breakable and fireproof
insulation panels.
Fig. 4 Modular construction overview
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3.2 Components and accessories
3.2.1 Contact system
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•
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3.2.2 Arc chute (code nr: 2)
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Design and specifications are subject to change without notice
Gerapid breakers are equipped with a two-stage con-
tact system [Fig. 5], consists of a main contact and an
arcing contact. With this proven design of the contact
system, the main contact is not subjected to any wear or
tear.
The main contacts are coated with a silver, composite
material. The arcing contact and link braid are made
from copper and can be easily replaced.
The flexible bend is linked to the arcing contact by
means of very tight braid.
Arc runner
Arcing contact
Braid
Flexible band
Fig. 5 Contact system: new (upper) and old (lower) type
Compact and modular design of the arc system requires
no additional magnetic support and allows smaller
safety distances with high breaking capacity.
Because of the new compact dimensions these breakers
can be installed in extremely small enclosures (from
600mm; 2ft) and offers a cost-effective solution for re-
placements.
An adaptor is used to mount the various arc chutes for
different operating voltages to the breakers.
The arc chutes consist of a highly durable, arc-proof ma-
terial, wherein the arc plates have been integrated.
The arc plates split the arc into partial arcs and increase
the arcing voltage by multiplying the anode and cath-
ode voltage drop. Because of their high heat capacity,
the plates and arc chute walls absorb a large amount of
the arc's energy.
Main contact
S47183-e 01/2008
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