DSTC175 57310001-KN ABB distributed control system industrial DCS module card

Description

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UC = Universal Current = AC/DC
S 200 MUC MCBs can be used in the one-pole version
as 220 V DC, and in the 2-pole or 4-pole version with
series connection of two poles up to 440 V DC.
S 200 MUC contains fitted permanent magnets, which
assists in the forced extinguishing of the arc.
If voltages to earth exceeding 220 V DC may occur,
2-pole S 200 MUC is to be used for one-pole disconnection,
and four-pole S 200 MUC for all-pole disconnection.
For DC incoming supply from above S 200 MUC-… MCBs
have, in the area of arc chutes, permanent magnets,
it is therefore necessary to take into account the polarity
during the installation process.
Doing so ensures that in the case of a short circuit the
magnetic field of the permanent magnets corresponds
with the electromagnetic field of the short-circuit current,
therefore safely leading the short circuit into the arc chute.
Incorrect polarities may cause damage to the MCB. This is
why – in the case of top-fed devices – terminal 1 must be
connected to (-) and terminal to 3 (+).