Siemens 5SY4540-7CV, MCB, Icu=15kA 230/400V, 1P+N, C40.
The Siemens 5SY4540-7CV is a 1P+N miniature circuit breaker rated C40 with a breaking capacity Icu of 15 kA at 230/400 V.
The 1P+N form factor (single-pole switched plus neutral bar) saves one module width versus a 2-pole breaker when the neutral only needs isolation, not overcurrent protection — a common choice for single-phase final subcircuits in European-style panels.
The Icu is 15 kA at 230/400 V, which is the maximum short-circuit current the breaker can safely interrupt under fault conditions.
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
1P+N means the breaker switches the phase (line) conductor only, while the neutral is connected through a solid bar that does not open under overload. This is typical for single-phase circuits where neutral overcurrent protection is not required.
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