The Siemens 5SY4132-8CV is a 1-pole miniature circuit breaker with a D32 tripping curve and a 15 kA interrupting capacity at 230/400 V. That 15 kA Icu means it can safely clear a fault up to 15,000 amps without welding its contacts or rupturing the enclosure — critical for downstream coordination in high-fault-capacity panels where a standard 6 kA or 10 kA MCB would fail to interrupt and pass the arc upstream.
Panel Integration
Snap-on DIN rail mount, standard 1-pole width (roughly 18 mm per pole).