Depending on the type of gear (i.e., switchboard construction versus switchgear construction) and the manufacturer, you may be able to get a main breaker with a "maintenance mode" feature. That will allow for a faster trip time, and therefore a lower arc flash energy, and can be manually selected whenever you need to "interact" with the board. This feature essentially disables any selective coordination you might have established, so that a short circuit in a 100 watt 120 volt light bulb might cause the main breaker to trip. But you must accept that risk, during the time that maintenance is being done, and you must manually return the main breaker to its normal trip mode after the maintenance is finished.
This might reduce fault current but that often (at least in my calculations) results in longer OCPD clearing time and higher PPE requirements.Additionally, you can adjust the impedance of the transformer to reduce the fault current level or you can add a current limiting reactor.
This might reduce fault current but that often (at least in my calculations) results in longer OCPD clearing time and higher PPE requirements.