Siemens SENTRON 5SL4 series, 5SL4404-0RC miniature circuit breaker, 4 A, 4-pole, Z characteristic, 10 kA breaking capacity.
The 5SL4404-0RC: Four poles means it simultaneously disconnects all three phases plus neutral in a TN or TT system, meeting the disconnection requirements for a 4-wire final subcircuit without a separate neutral-link fuse.
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Z-curve breakers trip between 2.5× and 4× rated current (10 A to 16 A magnetic trip threshold). This narrow band is chosen for circuits where a B-curve would nuisance-trip on moderate inrush and a C-curve would not clear a hard fault fast enough — common on control transformers, PLC power supplies, and semiconductor loads.
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