BOM / RFQ

Siemens 5SY4414-8CV — Miniature Circuit Breakers (MCB)

Siemens 5SY4414-8CV MCB, Icu=15kA 400V 4P D0.3

MPN5SY4414-8CV

Siemens 5SY4414-8CV, miniature circuit breaker, 4-pole, D characteristic, 0.3 A rated current, 15 kA breaking capacity at 400 V AC.

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Siemens 5SY4414-8CV datasheet (PDF)

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Product details

At 0.3 A this is an unusually low-rated D-curve MCB, so confirm the downstream load's inrush duration and magnitude stay below the magnetic trip threshold before specifying.

Where it is used

Snap-on DIN-rail mounting for standard 35 mm rail. The 4-pole format (3 phases + neutral) suits three-phase industrial control panels where the neutral requires overcurrent protection. The D0.3 rating is typical for control transformers, contactor coils, or PLC power supplies in a machine-tool or conveyor line.

Frequently asked questions

Where can I buy 5SY4414-8CV and get a price?

The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer.

What is the breaking capacity of 5SY4414-8CV?

The rated short-circuit breaking capacity (Icu) is 15 kA at 400 V AC, per the specification.

What does D0.3 mean on this MCB?

D0.3 means a D-curve magnetic trip (10–20× In) and a 0.3 A rated current. The D curve is intended for loads with high inrush, and the 0.3 A rating is the continuous current the breaker carries without tripping.