Selective main MCB for branch-circuit coordination
What the E-curve and 25 kA mean for your coordination study
The E-characteristic is a deliberate choice for main or feeder positions where you need time-delayed tripping to ride through motor inrush or transformer magnetizing current without nuisance opening. It sits between the standard K and Z curves in its magnetic-trip threshold — typically 8 to 12 times In — so a 16 A unit holds through a short-duration 128 A to 192 A surge. The 25 kA rated short-circuit capacity (Icn) per IEC 60898 is the full interrupting rating at 230 V AC; that is a full order of magnitude above the 4.5 kA or 6 kA common on downstream B- or C-curve MCBs, which is exactly what selective coordination demands.
Panel fit and mounting constraints
Depth of 76.3 mm and height of 128 mm — verify against your enclosure's internal clearance, particularly if a busbar or cover is tight. Saddle terminals accept conductors up to the rated cross-section; sealable cover is provided for metering-lock applications. IP20 with connected conductors — that is typical for a distribution board interior, not for wet or dust-laden environments.
Listed as current-production (active lifecycle stage) from Siemens. No official successor has been published, and the part remains in the SENTRON catalog for new installations and replacement.