The Siemens 5SY4502-8CV is a 1-pole+N miniature circuit breaker (MCB) with a D2 tripping characteristic and a rated short-circuit breaking capacity (Icu) of 15 kA at both 230 V and 400 V. The 1P+N configuration switches the phase and provides overcurrent protection on the phase only, with the neutral switched but not protected.
Integration & Deployment
The 1P+N width occupies two modular spaces (2 x 18 mm). The D2 curve provides selectivity upstream of a downstream MCB with a lower I²t let-through — coordinate with the upstream device's short-time withstand.