The WB1GA380 is a replacement coil from the Schneider Electric TeSys range, designed specifically for the CV1B and CV3B contactors. It's a low-consumption AC coil rated at 380 V AC at 50 Hz, pulling 130 to 160 W on inrush and settling to 16 to 25 W holding power. The coil's average resistance is 85.48 ohms at 68 °F (20 °C), and the closed-circuit inductance sits at 6 H. It's good for 1.2 million mechanical cycles.
The 380 V AC 50 Hz coil voltage is specific — not a 400 V or 415 V nominal. The operational limits are 0.85 to 1.1 Uc at 50 Hz below 131 °F (55 °C), so it holds in from about 323 V to 418 V. If your control voltage sags outside that band, the contactor drops out. The inrush-to-hold ratio is about 6:1 on power (130-160 W inrush vs 16-25 W hold), which is typical for AC coils. Your control transformer needs to handle that surge without drooping below the dropout threshold.