ABB CI840A 3BSE041882R1 Analog module industrial system controller

Description

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According to IEC 60364-5-53, to ensure discrimination between two residual
current protective devices in series, these devices shall satisfy both the following
conditions:
– the non-actuating time-current characteristic of the residual current protective
device located on the supply side (upstream) shall lie above the total operating
time-current characteristic of the residual current protective device located
on the load side (downstream);
– the rated residual operating current on the device located on the supply side
shall be higher than that of the residual current protective device located on
the load side.
The non-actuating time-current characteristic is the curve reporting the
maximum time value during which a residual current greater than the residual
non-operating current (equal to 0.5.I∆n) involves the residual current circuitbreaker without causing the tripping.
As a conclusion, discrimination between two RCDs connected in series can be
achieved:
– for S type residual current circuit-breakers, located on the supply side,
(complying with IEC 61008-1 and IEC 61009), time-delayed type, by choosing
general type circuit-breakers located downstream with I∆n equal to one third
of I∆n of the upstream ones;
– for electronic residual current releases (RC211/212, RC221/222, RCQ) by
choosing the upstream device with time and current thresholds directly greater
than the downstream device, keeping carefully into consideration the tolerances
(see Vol. 1, Chapter 2.3: Type of release).
For the protection against indirect contacts in distribution circuits in TT system,
the maximum disconnecting time at I∆n shall not exceed 1 s (IEC 60364-4-41,§
413.1)