Siemens SENTRON 5SU1354-6LB20 RCBO — 20 A, Type B, 1P+N
The 20 A rating is at 30 °C ambient; derate to 18.8 A at 40 °C, 17.4 A at 50 °C, and 14.6 A at 70 °C — important when packing multiple RCBOs into a warm enclosure. The short-time delayed G design (super resistant K) means the residual-current element tolerates brief leakage pulses from equipment like VFDs or UPS filters, reducing nuisance trips on sensitive circuits. Rated insulation voltage (Ui) is 264 V, surge voltage resistance is 4 kV, and overvoltage category III applies — this RCBO is designed for fixed-installation distribution boards, not portable equipment.
Mounts in any position on DIN rail; supply top or bottom. Installation depth 70 mm, overall depth 77 mm. Width 36 mm (2 MW). Halogen-free and silicon-free.