What the 20 A AC-3 rating means for the BOM line
The 3RA2120-4BA26-0BB4: That 20 A figure governs the full-load current of the motor it can start and stop under load, not the resistive heating current. Maximum operating voltage for AC-3 is 690 V, so the 400 V rating is well inside the device's insulation envelope. The 24 V DC coil is consistent with modern control-voltage architectures in PLC-driven panels. The starter ships as a pre-assembled unit combining a 3RT2026-1BB40 contactor with a 3RA2921-1BA00 link module, reducing wiring and panel space compared to a contactor-plus-overload built from loose components.
Mounting and thermal clearance for panel layout
The S0 form factor — 45 mm wide, 193 mm tall, 107 mm deep — fits standard 200 mm deep enclosures. Clearance requirements are specified: 50 mm above, 20 mm below, 20 mm at the sides, and 20 mm forward. Zero clearance behind the unit, so it can sit flush against the back panel.
Active production and compliance documentation
Substance prohibited date of 10/01/2009 confirms RoHS compliance per the EU directive. The operating temperature range of -20 to +60 °C and storage range of -50 to +80 °C cover most industrial and warehouse environments.