What it is and what it does
The Siemens SENTRON 5SV3617-3 is a 2-pole residual current circuit breaker (RCCB) rated for 80 A continuous load at 40 °C, tripping on a 300 mA residual current. The Type F designation means it handles sinusoidal AC faults plus composite and smooth DC fault currents up to 10 mA — common on variable-speed drives, washing machines, and other inverter-fed loads where standard AC types can blind. The short-time delayed switching function gives it a deliberate trip delay, so it coordinates downstream with instantaneous RCCBs and avoids nuisance trips from short-duration leakage spikes like those from connected electronics.
Mounting and panel fit
Snaps onto DIN rail (REG) and takes up 2 modular width units (36 mm wide). Depth is 70 mm, height 90 mm. Mounting position is any orientation, and the supply can land top or bottom — no forced polarity for the line/load side. That 70 mm depth is the same as most SENTRON MCBs and RCCBs, so it rows cleanly in a standard distribution board without protruding past the gland plate. IP20 rating applies once installed with conductors connected; the enclosure provides the rest of the ingress protection.
Thermal derating and short-circuit performance
At 40 °C ambient it carries the full 80 A. Above that, the rated current drops: 77.87 A at 45 °C, 74.77 A at 50 °C, 70.26 A at 55 °C, 64.32 A at 60 °C, 56.96 A at 65 °C, and 48.2 A at 70 °C. The short-circuit current rating is 10 kA per IEC 61008-1, with an I²t let-through of 110 000 A²·s. The surge current resistance is rated at 3 kA, which covers most inrush from motor drives or switching power supplies without welding the contacts.
What the approvals tell you
Rated according to EN 60898 (0.8 kA rated value) and IEC 61008-1 (0.8 kA). Overvoltage category III. Silicon-free construction. The 50 Hz supply frequency is fixed — not suitable for 60 Hz systems without checking the manufacturer's frequency range. The minimum test voltage for the test circuit is 100 V.