It is the overload element that pairs with a SIRIUS contactor to form a motor starter — the relay monitors motor current and trips on overload, opening the contactor via its auxiliary contacts.
For motors with longer acceleration times (high-inertia loads), a Class 20 or 30 relay would be needed; this part is sized for normal conveyor, pump, and fan starts. The S00 frame size (45 mm wide, 92 mm high, 78 mm deep) is the smallest SIRIUS overload relay footprint, designed for direct mounting to SIRIUS contactors in the same frame size. Stand-alone installation is also supported per the evidence, with 6 mm clearance required at the side and zero clearance needed upwards, forwards, backwards, or downwards — a tight-panel advantage. Cage clamp terminals on both the main current circuit and auxiliary/control circuit accept 2× (0.5 to 2.5 mm²) solid or 2× (0.5 to 1.5 mm²) finely stranded with ferrule. AWG equivalents are 2× (24 to 14) for main contacts and 2× (20 to 14) for auxiliary contacts. This spring-clamp termination eliminates routine re-torquing in high-vibration environments. Auxiliary contact ratings: 1 A at 24 V, 3 A at 120 V, 2 A at 230 V, 1 A at 400 V — these are the switching capacities for the relay's built-in N/C and N/O contacts that signal the contactor coil or PLC input. The 6 kV rated surge voltage resistance (impulse withstand) means the auxiliary circuit can handle transient spikes common in industrial environments without false tripping or contact welding. Shock resistance is 8g for 10 ms, adequate for most fixed industrial machinery but not for mobile equipment with repeated high-G impacts. ATEX certification (DMT 98 ATEX G 001) permits installation in potentially explosive gas atmospheres — the relay itself is not an ignition source when properly installed and within its ratings. This is a documented compliance path for Zone 1 or Zone 2 applications, not a generic 'suitable for hazardous area' claim.
Compliance Documentation
The part carries a substance prohibitance date of 07/01/2006, aligning with the original EU RoHS directive (2002/95/EC) effective date. Full declarations of conformity for ATEX, CE, and applicable IEC/EN standards are available from Siemens documentation — the evidence confirms the ATEX certificate number DMT 98 ATEX G 001, which is a Notified Body certification, not a self-declaration.