Page 208 - B_ELSB_Cat_2022_01_MCBs

1/208 ELECTRICAL INSTALL ATION SOLUTIONS FOR BUILDINGS - TECHNICAL DETAILS 9AKK 107991 A8329
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MCBs technical details
S 200 MUC series AC/DC Applications

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

voltage between conductors U n 220 V– 440 V– 440 V– 440 V– 440 V– (voltage reversal)
voltage between U n 220 V– 220 V– 440 V– 220 V– 220 V–
conductor and earth
MCB 1-pole 2-pole 2-pole 2-pole 4-pole
S 201 MUC S 202 MUC S 202 MUC S 202 MUC S 204 MUC
supply from below

supply from above

Examples for different voltage levels betweeen conductor and earth in the case of identical voltage between conductors:
voltage between conductors U 440 V– all-pole disconnection 440 V– 1-pole disconnection 440 V– all pole disconnection
n
voltage between U n 220 V– circuit symmetrically 440 V– circuit unsymmetrically 440 V– circuit unearthed or
conductor and earth earthed earthed unsymmetrically earthed
MCB 2-pole 2-pole 4-pole
S 202 MUC S 202 MUC S 204 MUC

➀ in the circuit diagram, the negative pole is earthed. ➁ in the circuit diagram, the positive pole is earthed.