Skip to main content
Log in
Siemens 5SY4520-8CV — 1-Pole MCB (DIN Rail)

Siemens 5SY4520-8CV MCB, 1P+N D20, 15kA Icu 230/400V

MPN5SY4520-8CV

Siemens 5SY4 series MCB, 1P+N, D20, Icu=15kA at 230/400 V AC.

Siemens 5SY4520-8CV datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Product details

What this MCB delivers

The Siemens 5SY4520-8CV is a 1P+N miniature circuit breaker rated D20 — a 20 A D-curve thermal-magnetic trip that handles inrush from motor starters, solenoid valves, or transformer primaries without nuisance tripping. The 1P+N form factor switches both phase and neutral, with the neutral pole opening after the phase pole and closing before it — a detail that matters for single-phase loads where a switched neutral simplifies isolation during maintenance.

Panel integration and DIN-rail fit

The 1P+N width is two modular units (36 mm), so it occupies one extra slot versus a 1P breaker — plan your enclosure fill factor accordingly.

Frequently asked questions

What is the interrupting rating of the 5SY4520-8CV?

The 5SY4520-8CV is rated for a 15 kA interrupting capacity (Icu) at 230/400 V AC, which covers most industrial panel secondary feeds and distribution sub-mains.

Where can I buy the 5SY4520-8CV?

This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time.

What does the D20 rating mean on this MCB?

D20 means a 20 A rated current with a D-curve magnetic trip characteristic (10–20× In), designed for loads with high inrush such as motors, transformers, and solenoid valves.

MPN
5SY4520-8CV