What it is and what it does
The Siemens 5SV3347-3 is a SENTRON residual current circuit breaker (RCCB) — 4 poles, rated 80 A, with a 30 mA trip threshold and Type F characteristic, meaning it detects AC residual currents plus pulsed DC and high-frequency AC from variable-speed drives or EV chargers. It's short-time delayed (selective), so it coordinates downstream with standard RCCBs to keep only the faulted branch off the bus. The 10 kA short-circuit current rating (SCCR) at 400 V AC means it can safely interrupt a fault up to that level without welding contacts or cascading upstream — critical for panel coordination studies.
Where it fits
Snaps onto DIN rail (REG) — 4 modular width units (72 mm wide), 70 mm deep, 90 mm tall. Mounting position any orientation. Supply feeds top or bottom. IP20 with conductors connected inside a distribution board — standard for enclosed panel use, not outdoor or washdown.
Thermal derating and real-world current
Full 80 A rating holds at 40 °C ambient. At 45 °C it derates to 77.57 A; at 50 °C to 74.59 A; at 55 °C to 70.22 A; at 60 °C to 64.47 A; at 65 °C to 57.35 A; at 70 °C to 48.8 A. If your panel runs hot — say 55 °C inside — this RCCB can only carry 70 A continuously. The operating range is -25 °C to 45 °C; storage range -40 °C to 75 °C.
Lifecycle and sourcing
Current production — no end-of-life notice on record. Sourced to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time.