Its interrupting capacity is rated at 15 kA at 400 V AC — sufficient for high-fault-current panelboards where standard 10 kA breakers would not clear a bolted fault. The D-curve (10–20× In) suits loads with high inrush, such as small transformers, solenoid banks, or motor control circuits where nuisance tripping on start-up must be avoided.
Siemens 5SY4404-8CV MCB, 15kA Icu 400V 4P D4
MPN5SY4404-8CV
Siemens 5SY series MCB, 4-pole D-curve 4 A, Icu=15 kA at 400 V AC, order code 5SY4404-8CV.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Product details
Frequently asked questions
What is the breaking capacity of 5SY4404-8CV?
The MCB has an Icu of 15 kA at 400 V AC, meaning it can safely interrupt fault currents up to 15,000 A at that voltage without damage to the panel.
Where can I buy 5SY4404-8CV and get a price?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
5SY4404-8CV