The Siemens SENTRON 5SV3647-5KK14 is a 4-pole selective RCCB (residual current circuit breaker) rated for 80 A at 50/60 Hz, with a 300 mA residual tripping threshold. The Type B+ classification means it detects AC, pulsating DC, smooth DC, and high-frequency AC residual currents — covering VFD-fed loads, UPS systems, and EV charging circuits where pure sine-wave RCDs would be blind. The selective (S-type) design introduces a short intentional delay, so this unit coordinates downstream with standard RCCBs: on a fault, the nearest device trips first, keeping upstream circuits live. Mounts on DIN rail (REG) in any position, occupying 4 modular width units. The 70 mm depth matches standard distribution board cutouts. Rated short-circuit current withstand is 10 kA per IEC 61008-1, with a let-through current of 7 000 A and an I²t value of 60 000 A²·s — figures that matter when coordinating with an upstream MCB or fuse. The surge current resistance is rated at 5 kA (8/20 µs), covering lightning-induced transients common in industrial supply lines.
The 80 A rating holds up to 45 °C ambient. Above that, derate linearly: 72 A at 55 °C, 64 A at 60 °C, 56 A at 65 °C, and 48 A at 70 °C. If the RCCB is enclosed in a non-ventilated panel, expect the internal temperature to run 10–15 °C above ambient — factor that into the effective current capacity.
Silicon-free construction is noted for applications where silicone outgassing can contaminate contacts or optical surfaces — relevant in automotive paint shops or clean-room adjacent panels.