What this SIRIUS load feeder is
The Siemens 3RA1120-1ED24-0AP0 is a SIRIUS non-fused load feeder in size S0, built as a direct starter with bimetal motor protection. It ships as a pre-assembled unit containing the supplied contactor 3RT1024-1AP00, link module 3RA1921-1AA00, circuit-breaker 3RV1021-1EA10, and busbar adapter 8US1251-5DM07 — all matched for 60 mm busbar center-to-center spacing. Rated at 1.5 kW at 400 V with an insulation voltage of 690 V, this feeder is sized for motor loads up to that power on a 400 V three-phase line. The IP20 front protection keeps fingers out of the live terminals inside the panel — standard for enclosed switchgear.
Fastens by snapping onto 60 mm busbar systems — the busbar adapter is included. Solid or stranded wire from 1 to 6 mm² for the main circuit; dual-wire capability supports 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²). AWG equivalents for main contacts are 2x (14 to 10). Clearance requirements: 30 mm upwards, 10 mm forwards, 9 mm backwards, 0 mm downwards, 30 mm at the side — plan your enclosure depth at 148 mm plus the forward clearance.
Shock resistance rated at 12.5g. Lifecycle status is current production. The 3RA1120-1ED24-0AP0 remains an active catalog item from Siemens, not subject to phase-out or last-time-buy as of the latest manufacturer data.