The 30 mA sensitivity covers personnel protection against direct contact (IEC 60364-4-41), while the C-curve handles moderate inrush from motor and lighting loads without nuisance tripping. This is the 'Super resistant K' design variant, built for environments where nuisance tripping from transient surges or lightning-induced currents is a concern — the short-time-delayed K characteristic allows brief high-frequency leakage (like from VFDs or switching supplies) to pass without dropping the load, while still clearing a genuine ground fault at 30 mA.
Panel fit and physical integration
The unit occupies 11 modular width units on a standard DIN rail (198 mm wide, 77 mm deep, 90 mm tall) with an installation depth of 70 mm behind the panel face. The IP20 rating applies once the distribution board is installed and conductors are connected; the board itself provides the environmental seal.
Surge voltage resistance is 4000 V, and the unit handles a 3 kA surge current (8/20 μs waveform), which is the standard impulse for lightning-induced transients on low-voltage mains. Energy limitation class 3 means the RCBO limits let-through energy during a fault, reducing stress on downstream equipment and wiring. The test circuit requires a minimum of 195 V to verify the residual-current function — important to know if you're commissioning on a reduced-voltage supply.