Which transformer rating can be connected to a 4160 V, 3-phase, 4-wire system?

The transformer rating that can be connected to a 4160 V, 3-phase, 4-wire system is one that is compatible with the system voltage and configuration. The transformer rated at 2400/4160Y - 120/240 is designed for use on a 4160 V system because it has the capability to step down the voltage from 4160 volts to 240 volts in a four-wire configuration, where one of those phases can serve as a neutral for connecting residential or light commercial loads at 120 volts.

This rating signifies that the transformer can handle the system's line-to-line voltage of 4160 V (as part of the 'Y' connection configuration, which allows for a neutral) and can provide the necessary secondary voltage for typical residential and commercial applications (120/240V).

Other transformer ratings listed may not be appropriate for a 4160 V system due to their voltage ratings being either too low, incompatible with a 3-phase configuration, or not having the ability to provide the required line-to-neutral or line-to-line voltage for the applications intended on a 4160 V service. The nameplate voltages and configurations need to match the system they are connected to for safe and effective operation.