The 5SP3420-3: E-curve means the magnetic trip operates between 10× and 20× In — designed for transformer inrush or high-inductive loads where a C-curve would nuisance-trip. The 25 kA breaking capacity (per EN 60898) at 400 V gives selectivity headroom downstream; it also carries a 25 kA rating per IEC 60947-2, so it's rated for industrial distribution panels, not just residential. Snap it onto 35 mm DIN rail per EN 60715; 6 MW wide (108 mm) leaves room for a 2-pole isolator alongside in a standard 12-MW enclosure. Terminal capacity accepts 2.5–50 mm² solid or stranded, saddle terminals included. Lockable via integrated slide (padlock, wire seal, or cable tie).
Lifecycle stage is current — no phase-out notice, no successor assigned.