Page 206 - B_ELSB_Cat_2022_01_MCBs

1/206 ELECTRICAL INSTALL ATION SOLUTIONS FOR BUILDINGS - TECHNICAL DETAILS 9AKK 107991 A8329
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MCBs technical details
S 200 UDC series DC Applications

DC = Direct Current For DC incoming supply from above S 200 UDC-… MCBs
S 200 UDC MCBs can be used in the one-pole version as have, in the area of arc chutes, permanent magnets, it is
60 V DC (125 V DC up to 40 A), and in the 2-pole version with therefore necessary to take into account the polarity during
series connection of two poles up to 125 V DC (250 V DC up the installation process.
to 40 A). Doing so ensures that in the case of a short circuit the
magnetic field of the permanent magnets corresponds
S 200 UDC contains fitted permanent magnets, which with the electromagnetic field of the short-circuit current,
assists in the forced extinguishing of the arc. therefore safely leading the short circuit into the arc chute.
If voltages to earth exceeding 60 V DC may occur, 2-pole S Incorrect polarities may cause damage to the MCB. This is
200 UDC is to be used for one-pole disconnection. why – in the case of top-fed devices – terminal 1 must be
connected to (-) and terminal to 3 (+).

Example for permissible voltages between the conductors depending on the number of poles and circuit layout:
voltage U n 60 V DC 125 V DC 125 V DC 125 V DC
between (125 V DC up to 40 A) (250 V DC up to 40 A) (250 V DC up to 40 A) (250 V DC up to 40 A)
conductors
voltage U n 60 V DC 60 V DC 125 V DC 60 V DC
between (125 V DC up to 40 A) (125 V DC up to 40 A) (250 V DC up to 40 A) (125 V DC up to 40 A)
conductor
and earth
MCB 1-pole 2-pole 2-pole 2-pole
S 201 UDC S 202 UDC S 202 UDC S 202 UDC
supply from below

supply from above