It mounts directly onto a size S0 contactor, forming a compact motor starter package. The adjustable current response value spans 4.5 to 6.3 A, set via a dial on the front face. Rated operational current is 6.3 A at up to 690 V, 50/60 Hz. The relay is purely thermal — a bimetallic strip bends with heat from the motor current, actuating a snap-action contact on the auxiliary circuit. It supports both manual and automatic reset, selectable via a slide switch on the housing.
Fastening method is contactor mounting — the relay clips directly onto the front of a SIRIUS S0 contactor (e.g., 3RT1034 or 3RT1036 frame). No DIN rail footprint is consumed; the relay rides on the contactor. The main circuit uses screw-type terminals, top and bottom, accepting 2× (0.5 to 1.5 mm²) solid/stranded or 2× (0.75 to 2.5 mm²) fine-stranded with ferrules. AWG equivalents: 2× (16 to 12) solid, 2× (14 to 8) stranded. Tightening torque for main contacts is 2 to 2.5 N·m. Auxiliary and control circuits also use screw terminals, accepting 2× (20 to 16) or 2× (18 to 14) AWG. Required spacing to grounded parts at the side is 6 mm. The relay measures 85 mm deep, 45 mm wide, and 85 mm high. For a panel OEM wiring up a motor starter row, this means the relay adds no extra width to the contactor footprint — the width is the same as the S0 contactor itself.
Environmental and electrical ratings
Relative humidity during operation: 0 to 90 %. Installation altitude is limited to 2000 m above sea level without derating. Surge voltage resistance is rated at 6 kV, and insulation voltage at AC with pollution degree 3 is 690 V. Shock resistance per IEC 60068-2-27 is 8 g for 11 ms. Total typical power loss is 5.7 W; at rated current in AC hot operating state it reaches 6.6 W. Per-pole dissipation is 2.2 W. The auxiliary contact ratings: 2 A at 24 V, 0.22 A at 110 V, 2 A at 230 V — these are the switching capacities for the internal N/C and N/O contacts that signal a trip to the PLC or cut the contactor coil.
Substance prohibitance date per RoHS/REACH is 05/01/2012, confirming compliance with the EU directive. The relay carries no explicit UL/CSA listing in this evidence, but the SIRIUS family is typically UL/CSA recognized when ordered with the appropriate suffix; verify the specific variant for your jurisdiction.