The 20 A thermal current (Ith) at 50 Hz gives the continuous current capacity; the average power-circuit impedance of 3 mOhm keeps voltage drop low under load. Rated breaking capacity reaches 110 A at 440 V, 80 A at 500 V, and 70 A at 660–690 V per IEC 60947, so it clears faults across standard industrial voltages. Mechanical durability is 5 Mcycles, electrical durability 0.3 Mcycles at 20 A AC-1.
Mounts on a rail or plate — the 57 mm depth and 90 mm width fit a standard DIN-rail footprint, leaving room alongside other TeSys K components for a compact reversing starter or source-transfer assembly. IP20 finger-safe terminals (per VDE 0106) mean it can sit in a control cabinet without additional shrouding, though the solder-pin / busbar connection (1.5 x 0.9 mm) expects a specific wiring method — not a screw-clamp terminal.
Compliance documentation includes VDE 0660, IEC 60947, BS 5424, and NF C 63-110. The insulation system is rated 600 V per UL 508 and CSA C22.2 No 14, and 690 V per IEC 60947-4-1 for the power circuit.