The Siemens SENTRON 5SM3621-4KK14 is a 2-pole residual current operated circuit breaker (RCCB), type B+, rated 16 A with a 300 mA trip sensitivity at 230 V AC. The short-time delayed switching function (selective type) allows coordination with downstream devices, so that only the faulted branch clears on a ground fault — useful for maintaining supply to critical loads in a panel.
Selectivity and fault coordination
The short-time delayed design (type B+, selective) means this RCCB withstands a brief inrush or transient without tripping, giving downstream MCBs or RCCBs time to clear a fault first.
Depth is 70 mm, height 90 mm. Mounting position is unrestricted.
Listed as current production. No official successor has been issued for this order code.
Environmental and installation notes
Silicon-free construction. Overvoltage category III.