Panel fit — 45 mm wide, 165 mm deep, screw-and-snap DIN rail
The 3RA6120-0BP30 measures 45 mm wide by 170 mm tall by 165 mm deep — it takes two standard DIN-rail modules and leaves room for gland plates in a 200 mm deep enclosure. Fastening is screw and snap-on mounting to a horizontal standard mounting rail, so it wires up clean without extra brackets. The main circuit connects via plug-in without terminals — no screw torque to check, just seat the contact blades and latch.
Breaking capacity and motor protection — 53 kA at 400 V, adjustable trip class
Rated 53 kA at 400 V, this compact starter coordinates with upstream MCCBs and fuses up to that fault level — the SCCR headroom covers most 400 V distribution panels without a series-rating sticker. Trip class is adjustable between CLASS 10 and CLASS 20 (IEC 60947-6-2), so you set the overload relay to match the motor start profile: CLASS 10 for short acceleration times on pumps and fans, CLASS 20 for high-inertia loads like conveyors or crushers. Continuous operation per IEC 60947-6-2 means the thermal memory tracks motor heating during repeated starts — no nuisance tripping on a restart after a brief stop.
No direct pin-compatible replacement exists — this is the active SIRIUS compact starter for 400 V motor circuits up to 370 W at 400 V.