It mounts directly onto a contactor — the fastening method is contactor mounting — and uses a thermal bimetallic release to protect against overload conditions. The integrated auxiliary switch provides a "Tripped" signal message, so the relay reports its state back to the control system without a separate auxiliary block.
The auxiliary contact ratings are given per voltage: 2 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 signal circuit, not the main power path. The main current circuit connects via spring-loaded terminals accepting 2 × (0.5 to 2.5 mm²) solid or stranded wire, so no screw tightening is needed on the power connections.
Size S00 is the smallest SIRIUS frame — 45 mm wide, 87 mm tall, 70 mm deep. It mounts directly onto the matching S00 contactor, saving DIN-rail space. Storage and transport range extends to -55 to +80 °C.