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Siemens 5SY4540-8CV — 1-Pole MCB (DIN Rail)

Siemens 5SY4540-8CV MCB, 1P+N D40, 15kA Icu 230/400V

MPN5SY4540-8CV

Siemens 5SY4540-8CV, MCB Icu=15kA 230/400V 1P+N D40.

Siemens 5SY4540-8CV datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Product details

What the rating means for your panel

The Siemens 5SY4540-8CV is a single-pole-plus-neutral miniature circuit breaker with a D40 trip curve and a 15 kA ultimate short-circuit breaking capacity (Icu) at 230/400 V. The D40 characteristic (40 A rated current, D curve) provides a high magnetic trip threshold — typically 10 to 20 times rated current — so it tolerates the inrush of motor loads, transformers, or welding equipment without nuisance tripping. It's a standard DIN-rail mount, sized for the usual panel enclosure.

Frequently asked questions

Where can I buy 5SY4540-8CV and how do I get a price?

Sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.

What is the closest pin-compatible alternative to 5SY4540-8CV in this component family?

No official successor or cross-reference is listed for this order code. If you need a substitute, the closest functional match would be another Siemens 5SY4-series MCB with the same pole count, D40 curve, and 15 kA breaking capacity — but verify physical fit and any accessory compatibility against your specific panel layout.

What is 5SY4540-8CV's listed description?

MCB Icu=15kA 230/400V 1P+N D40 — a single-pole-plus-neutral miniature circuit breaker rated 40 A with a D trip curve and 15 kA ultimate breaking capacity.

MPN
5SY4540-8CV