The 5SY4440-6: Used in mechanical engineering and industrial switchgear, this MCB protects three phases and the neutral with a single 4-module wide footprint.
What the ratings mean for your panel
10 kA interrupting rating at 400 V AC for final distribution; 15 kA rating provides headroom for industrial panels. B-curve trips at 3–5 times rated current, so it handles resistive loads and light motor starts without nuisance tripping. For general-purpose protection in commercial or light industrial panels, this is the curve to spec. Rated for 400 V AC across all poles, with 440 V capability in single- or multi-phase operation. The DC side is rated 72 V max, covering control circuit isolation if needed.
Compliance and environmental specs
Certified to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077. That triple listing streamlines approvals for export panels or multi-national skids. Pollution degree 3 and overvoltage category III mean it holds up in dirty power environments. Halogen-free and silicon-free — relevant for cleanroom or semiconductor fab panels where outgassing can contaminate optics or wafers. IP20 with conductors connected is standard for enclosed panelboard mounting.
Sourcing reality
Lifecycle is current production. Source through standard distribution; quote to order.