Reversing starter for 60 mm busbar systems
The Siemens 3RA2220-1JH24-0BB4 is a SIRIUS reversing starter in size S0, designed to snap directly onto 60 mm busbar systems — no separate mounting plate or DIN rail adapter needed for the busbar feed. It ships as a factory-assembled unit containing a 3RT2024-2BB40 contactor, a 3RA2921-2AA00 link module, and an 8US1251-5NT11 busbar adapter — three components that would otherwise need separate ordering and wiring.
Mounting and clearance envelope
The reversing starter measures 260 mm high by 90 mm wide by 165 mm deep, and mounts vertically on the busbar system — the vertical orientation is specified for proper thermal convection through the bimetallic overload. Minimum clearances around the unit: 50 mm above, 32 mm in front, 10 mm below, 10 mm at the sides, and 0 mm behind (the back sits flush against the busbar adapter). These gaps must be maintained for cooling air flow and arc-flash containment.
Termination and environmental limits
Main current circuit connections use spring-loaded terminals — no screw torque verification needed, and the connection stays tight under vibration. The spring clamp accepts solid or ferruled stranded wire without periodic retightening. Operating temperature range is -20 to +60 °C, with storage and transport tolerance from -50 to +80 °C. The 24 V control voltage is listed as 24... 24 V, indicating a fixed 24 V DC/AC coil — confirm the control supply polarity if DC.
Lifecycle and compliance
No stock-holding claim — quoted per order.