EI802F ABB distributed control system industrial DCS module card

Description

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Selective and current-limiting circuit-breakers
Selective (non current-limiting) circuit-breakers are classified
in class B (according to the IEC 60947-2 Standard). It is important to know their Icw values in relation to any possible delayed
trips in the event of short-circuits.
The current-limiting circuit-breakers E2L and E3L belong to
class A. The short-time withstand current Icw is not very important for these circuit-breakers, and is necessarily low due to the
operating principle on which they are based. The fact that they
belong to class A does not preclude the possibility of obtaining
the necessary selectivity (e.g. current-type or time-type selectivity).
The special advantages of current-limiting circuit-breakers
should also be underlined. In fact, they make it possible to:
– significantly reduce the peak current in relation to the prospective value;
– drastically limit specific let-through energy.
The resulting benefits include:
– reduced electrodynamic stresses;
– reduced thermal stresses;
– savings on the sizing of cables and busbars;
– the possibility of coordinating with other circuit-breakers in
the series for back-up or discrimination.

All the circuit-breakers are available in fixed and withdrawable,
three-pole or four-pole versions.
Each series of circuit-breakers offers terminals made of silverplated copper bars, with the same dimensions, regardless of
the rated currents of the circuit-breakers.
The fixed parts for withdrawable circuit-breakers are common
to each model, regardless of the rated current and breaking
capacity of the relative moving parts, except for the E2S circuitbreaker which requires a specific fixed part.
A version with gold-plated terminals is available for special requirements, linked to use of the circuit-breakers in corrosive
environments.
The availability of various types of terminals makes it possible
to build wall-mounted switchgear, or switchgear to be accessed
from behind with rear connections.
For special installation needs, the circuit-breakers can be fitted
with various combinations of top and bottom terminals.
Furthermore new dedicated terminal conversion kits give Emax
maximum flexibility, allowing horizontal terminals to be changed
to vertical or front ones and vice versa.