What 1SDA058308R0001 actually is
The ABB 1SDA058308R0001 is a Sace Emax E2S air circuit-breaker, type E2S 08 W MP, rated In 800 A on a four-pole withdrawable chassis. It ships as a moving-part execution rather than a fixed pattern, which means a cassette/cradle is part of the swap path whenever it goes in or out of a cubicle. Protection is handled by the PR121-LSIG electronic trip unit, giving L, S, I and G functions on the same module — the unit a controls integrator reads first when verifying selectivity against the upstream transformer or the downstream feeder.
Icu is listed at 85 kA, which is the short-circuit breaking capacity a panel designer matches to the prospective fault level at the bus. Above 85 kA available fault current the breaker is not the right frame for the job, so that figure is the gate, not the headline In. At 800 A the Emax E2S sits below the upper end of its frame range. Holding rating headroom rather than running the frame at maximum is the conservative read here. Shipping mass is 70 kg, which is what dictates the rigging plan — a two-person lift with the breaker still on its pallet, and a panel baseplate rated for that mass with the withdrawable cassette seated.
Where this class of breaker is used
Emax-frame air circuit-breakers are specified as the main incomer or bus-tie on low-voltage switchboards feeding large motor centres, process MCCs and the auxiliary distribution of generation plants. With four poles and a withdrawable execution, 1SDA058308R0001 fits where the neutral is switched and the breaker has to be racked out for maintenance without disturbing the busbar.