Panel fit and coil voltage
The Mitsubishi SN25CXAC400V is an AC-operated contactor with a 400 V coil — that coil voltage tells you it's meant for a 400 VAC control circuit, common in European and Asian 400 V line-to-line panels. It's not a 24 VDC or 230 V coil; if your control transformer taps off 400 V, this is the right pull-in voltage.
