Coil voltage and amp rating
The SDN21CXULDC24V: Coil is 24 VDC — standard for PLC-driven panels where you want to avoid AC hum and keep the coil dropout predictable. The 32 A rating covers most small-to-medium motor starters up to about 15 HP at 460 V three-phase, but always confirm the motor full-load amps against the contactor's AC-3 rating.