The 415 V AC 50 Hz coil is a wide-range AC control circuit, with a drop-out threshold of 0.3 to 0.6 Uc and an operational range of 0.7 to 1.25 Uc across -5 to 55 °C, so it holds in reliably on a nominal 415 V line and drops cleanly on undervoltage.
The 4-pole arrangement (2 NO + 2 NC) gives flexibility for switching two independent resistive loads or combining a load with a signalling contact — no auxiliary contact block needed for basic feedback. Screw-clamp terminals on both power and control circuits accept flexible wire with or without ferrules (1 to 4 mm²) and solid wire up to 4 mm²; tightening torque is 1.2 N.m for both circuits, so one driver setting covers the whole install.