Siemens 5SY8415-7 SENTRON 4-pole MCB, C-curve, 1.6 A
The Siemens 5SY8415-7 is a 4-pole miniature circuit breaker from the SENTRON series, rated 1.6 A at 45 °C with a C-curve tripping characteristic. For a 1.6 A rating, that means magnetic trip between 8 A and 16 A. The 76 mm depth includes the terminal arc; installation depth is 70 mm.
Breaking capacity and standards compliance
The 70 kA rating at 400 V AC per IEC 60947-2 is the headline figure for industrial panels — it means the breaker can safely interrupt a fault current up to 70,000 A without welding contacts or rupturing the case. For UL 1077 / CSA C22.2 No. 235 listed applications, the interrupting capacity is 5 kA at 400 V AC; this is a supplemental protector rating, not a branch-circuit rating per UL 489. The DC rating per IEC 60947-2 is 15 kA, relevant for battery-backed DC bus or UPS output circuits.
The 1.6 A rating is at 45 °C ambient. At 50 °C it derates to 1.57 A, at 55 °C to 1.53 A. The breaker can operate from -40 °C to 75 °C, with humidity limits of 95% at 55 °C, 55% at 70 °C, and 35% at 75 °C.
For a BOM freeze or second-source review, the closest functional peer within the SENTRON 5SY series is the 5SY6332-7CC — a 3-pole C-curve breaker with a different current rating and pole count. The 5SY8415-7 is 4-pole; a panel wired for 4-pole cannot accept a 3-pole unit without rewiring the neutral leg. The 5SY4304-7CV and 5SY6602-8 are also in the same family but differ in poles and curve. Always verify the pole count, rating, and curve before substituting.