Its C-curve tripping characteristic handles moderate inrush currents from motor starters and transformer banks without nuisance trips — the standard choice for general-purpose industrial branch circuits where the load isn't purely resistive. Breaking capacity is 10 kA per IEC 60898-1 and 35 kA per IEC 60947-2, with 15 kA at DC per IEC 60947-2. At DC, the 15 kA rating covers 60 V up to 72 V max — relevant for control circuits and battery-backed buswork. The 2-pole design switches both line conductors simultaneously, with no neutral conductor switching. That makes it a straight fit for single-phase 2-wire circuits or two legs of a 3-phase system where you need coordinated overcurrent protection on both poles.
Certification and deployment context
Dual-certified to IEC/EN 60898-1 and IEC/EN 60947-2 plus UL 1077. The UL 1077 listing (5 kA at AC,) qualifies it for North American supplementary protection applications — not as a branch-circuit main, but as component protection inside listed industrial control panels. Occupies 2 modular width units at 36 mm wide. Depth is 76 mm with 70 mm installation depth — check gland plate clearance if the panel is shallow.
Current production. The 5SY4201-7 is an active catalog item in the SENTRON family, not subject to phase-out or last-time-buy.