Technical Parameters Parameter / Feature Specification / Detail Model / Type A370D‑30‑11 (3‑pole AC contactor) Poles / Main Contacts 3 poles — 3 × Normally‑Open (NO) Auxiliary Contacts 1 × NO + 1 × NC Rated Operational Voltage (Main Circuit) Up to 690 V AC Conventional Free-air Thermal Current (Ith) 600 A at 40 °C Rated Operational Current — AC‑1 600 A @ 690 V (derated 500 A @ 55 °C, 400 A @ 70 °C) Rated Operational Current — AC‑3 370 A @ 380–415 V; 350 A @ 500 V; 315 A @ 690 V Maximum Motor Power (AC‑3) Up to 315 kW depending on voltage & load conditions Coil / Control Voltage Multiple variants (AC or DC) depending on ordering code Terminals / Connections Bar-type main terminals for heavy cables/busbars; screw-type auxiliary terminals Mechanical / Electrical Endurance Designed for industrial heavy-duty use; high cycle life Insulation / Impulse Withstand Voltage Ui = 1000 V; Uimp ≈ 8 kV Standards IEC 60947‑4‑1 compliant Operating Conditions Ambient temperature –25 °C … +50 °C (with overload relay); –40 °C … +70 °C (without overload relay) Typical Applications Three-phase motor control, heavy load switching, industrial machinery, power distribution panels, load isolation/bypass