The Siemens SIRIUS 3RU2126-4PB0 is a thermal overload relay in the S0 frame size, rated for CLASS 10 trip characteristics. It is designed to mount directly on SIRIUS contactors (fastening method: contactor mounting) and protect motor circuits up to 690 V. An integrated auxiliary switch provides a separate "Tripped" signal — useful for remote indication without an external aux block.
Mounting and Connections
Mounts directly on the matching SIRIUS contactor (any mounting position). Main circuit connections use screw terminals (M4) accepting 2×(0.5…1.5 mm²) or 2×(0.75…2.5 mm²) solid or stranded. Strip length follows standard screw-terminal practice. A Pozidriv PZ2 screwdriver is specified for the terminals.