What the 25 A AC-3 rating means for motor control
The 3RA2220-4DD27-0BB4: The supplied contactor is a 3RT2027-1BB40, and the link module is 3RA2921-1BA00 — these are the matched components that make the reversing pair and interlock. The S0 feeder size tells you the physical frame and the short-circuit breaking capacity range; it shares the same mounting footprint as other S0 devices in the SIRIUS family.
Mounting on 60 mm busbar systems — panel integration constraints
This reversing starter is designed for snapping onto 60 mm busbar systems, not for standard DIN rail. The mounting position is vertical only. Dimensions are 260 mm height, 90 mm width, and 165 mm depth — the depth is the critical dimension for enclosure depth selection, especially when the busbar system is mounted on a backplate. Clearance requirements: 50 mm upwards, 32 mm forwards, 10 mm downwards, and 10 mm at the side. Backwards clearance is 0 mm — the unit sits flush against the mounting surface. These are the minimum free air spaces for heat dissipation and arc containment; crowding them derates the thermal performance.
Active production — sourcing posture for this BOM line
No separate UL or CSA listing is stated in the spec record; confirm the specific approval mark required for your jurisdiction at RFQ.