The CR1F630Q7: The 630 A rating is in AC-4 duty (plugging, inching, reversing motor starts), which is the most demanding switching category. For AC-3 (normal motor starts) or AC-1 (resistive loads), the contactor can handle higher currents — the same frame is rated for 1000 A thermally (Ith) at 50 Hz. The 335 kW motor power at 400 V AC (AC-4) gives a direct motor-sizing reference: this contactor handles a 335 kW motor under reversing or jogging duty on a 400 V line. Rated breaking capacity is 6300 A at 220...440 V, dropping to 3200 A at 1000 V. Short-time withstand current (Icw) is 5.05 kA for up to 10 seconds at 104 °F (40 °C). The associated fuse rating is 630 A aM or gG at up to 440 V, or 1000 A BS88 — important for coordination when sizing upstream protection. Insulation voltage is rated at 1000 V per IEC 60947-4 and BS 775, and 1500 V per VDE 0110 Group C.
Operating temperature range is -15 to 70 °C (5...158 °F). Storage range is -60 to 80 °C (-76...176 °F). Maximum operating rate is 120 cycles per hour at 104 °F (40 °C).
Coil and control circuit details
The control circuit is AC 50/60 Hz at 380 V nominal. Latching and unlatching both require 0.85 to 1.1 times Uc (323...418 V). Average consumption is 8 VA unlatching and 2100 VA latching — the latching inrush is substantial, so the control transformer must be sized for that peak. Power dissipation per pole is 48 W in AC-3 duty and 120 W in AC-1 duty; factor that into enclosure heat load calculations.