The 1P+N configuration switches the phase and provides a switched neutral — common in single-phase final subcircuits where you need to isolate both conductors. The D0.3 rating is unusual: 0.3 A is a low current for an MCB, so this is likely protecting a control transformer primary, a signaling circuit, or a small power supply, not a general lighting or socket outlet circuit.
Siemens 5SY4514-8CV MCB, 1P+N D0.3, 15kA Icu 230/400V
MPN5SY4514-8CV
Siemens 5SY4514-8CV, MCB, 1P+N, D0.3 A, Icu=15 kA at 230/400 V, current lifecycle stage.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Product details
Frequently asked questions
What is the breaking capacity of 5SY4514-8CV?
The ultimate breaking capacity (Icu) is 15 kA at 230/400 V, which is the maximum fault current the breaker can safely interrupt.
MPN
5SY4514-8CV