The 3RA2115-1AA16-2BB4: This is a Siemens SIRIUS direct (on-line) starter in size S00 — a fully assembled combination of a contactor, a thermal bimetallic overload relay, and a magnetic short-circuit trip, all pre-wired through a link module. The 550 W rating at 400 V and 1.6 A at 480 V tell you the motor load it can handle continuously in AC-3 duty; the 0.75 hp figures at 460/480 V and 575/600 V confirm it fits fractional-horsepower motors common in conveyor, pump, and fan applications across North American and 400 V line voltages. The thermal bimetallic design tracks motor heating; the magnetic short-circuit trip handles fault clearing. Both main and auxiliary/control terminals are screw-type — no special tooling needed, just a standard slotted or Pozidriv driver.
DIN rail mounting and panel clearance
The dimensions — 97 mm depth, 45 mm width, 167 mm height — fit the S00 footprint that shares the same rail pitch as other SIRIUS S00 components. Clearance requirements: 50 mm upwards, 20 mm forwards, 20 mm at the side, 10 mm downwards, and 0 mm backwards. That 0 mm backwards clearance means the back of the unit can sit flush against the panel backplate — useful when you're packing components on a tight gland plate.
Supplied components — what's in the box
The starter ships with three pre-selected components: the contactor 3RT2016-1BB42, the circuit-breaker 3RV2011-1AA15, and the link module 3RA1921-1DA00 that ties them together. This is a coordinated assembly — you don't pick the overload or breaker separately. If you're swapping a failed unit, order the whole 3RA2115-1AA16-2BB4; the individual sub-components are available as spares but the coordination curve is factory-set.