Active production — what that means for your BOM line
The 3RA2220-4NB27-0BB4: The 24 V DC control voltage is common across modern PLC outputs, keeping the control transformer and wiring consistent. The unit ships with the contactor 3RT2027-1BB40, the circuit breaker 3RV2021-4NA10, the link module 3RA2921-1BA00, and the RH assembly kit 3RA2923-1BB1 — all pre-assembled and tested as a matched set. This eliminates the procurement and assembly coordination of sourcing each component separately.
Mounting and panel integration — size S0 footprint
The reversing starter measures 90 mm wide by 265 mm high by 130 mm deep, fitting the standard S0 feeder format. It mounts on a 35 mm DIN rail via the supplied adapter, or directly with screws — the adapter supports both snap-on and screw-fixed installation. Clearance requirements are specified: 50 mm upward, 32 mm forward, 10 mm downward, 10 mm at the side, and 0 mm backward. For a panel layout, this means the unit can sit flush against the backplane but needs 50 mm above for cable entry and arc deflection, and 32 mm in front for the operator access. Mounting position is vertical only, with an operating temperature range of -20 to +60 °C. The thermal bimetallic overload relay includes temperature compensation across that same range, so the trip curve stays accurate regardless of enclosure ambient temperature.
Trip class and protection coordination
This is the standard for standard-start induction motors — it allows the starting inrush to pass while protecting the motor winding from a locked-rotor condition. The short-circuit trip is magnetic (instantaneous), paired with the supplied circuit breaker 3RV2021-4NA10. For coordination purposes, this breaker provides Type 2 coordination with the contactor, meaning after a short-circuit fault the starter can be re-energized without replacing the contactor — only the breaker may need resetting. Both main and auxiliary/control circuits use screw-type terminals, rated for the S0 current range. The product extension allows adding an auxiliary switch block if the application needs additional status feedback beyond the built-in contacts.
Procurement — availability and documentation
Compliance documentation includes RoHS substance prohibition dated 10/01/2009, and the NEMA rating is classified as 'other' — this unit is designed to IEC/EN standards, not NEMA. For audit purposes, the manufacturer provides a declaration of conformity covering the applicable directives. The unit operates at 50/60 Hz, rated for AC-3 duty up to 690 V maximum. The 24 V DC coil draws from a standard 24 VDC control supply — confirm the control transformer sizing includes the inrush of both contactors in the reversing pair.