Technical Parameters Parameter / Feature Specification / Detail Model / Type A300D‑30‑11 (3‑pole AC contactor) Main Contacts (Power) 3 poles — 3 × Normally‑Open (3 NO) Auxiliary Contacts 1 × Normally‑Open (NO) + 1 × Normally‑Closed (NC) auxiliary contact block Rated Main‑Circuit Voltage (Ue) Up to 690 V AC (IEC rating) Rated Operational Current (AC‑1, Ie) Up to ~ 500 A at 690 V (at 40 °C free air rating) Current at Higher Temperatures / Derating e.g. 400 A @ 55 °C, 325 A @ 70 °C (depending on configuration) Motor Duty Rating (AC‑3, Ie) ~ 300 A at 415 V AC (motor‑load switching) Rated Operational Power (AC‑3, Pe) e.g. 160 kW @ 400–440 V, up to 250 kW at 690 V (depending on supply & load) Making / Breaking Capacity (AC‑3) Making capacity 10× Ie; Breaking capacity 8× Ie (per IEC 60947‑4‑1) Short‑Circuit / Withstand Current (Icw) / Capacity High short‑circuit and making capacity — suitable for strong industrial loads / motor starts / inrush currents Coil / Control Circuit Available in various coil voltages depending on variant (AC coil; many common coil‑voltage versions exist) Insulation & Impulse Withstand Voltage (Ui / Uimp) Insulation rating per IEC: Ui ≈ 1000 V; impulse‑withstand approx 8 kV Terminals / Connections Screw / bar‑type main‑circuit terminals (for heavy cables / busbars); standard auxiliary‑contact terminals for control wiring Mechanical Durability / Lifetime Designed for industrial heavy‑duty use, high cycle life and robust mechanical construction Typical Applications Three‑phase motor control (start/stop), heavy machinery, industrial load switching, power distribution panels, load isolation/bypass, pump/compressor control, general 3‑phase AC circuits