The statement is true. The maintenance bypass switch (MBS) is designed to manually bypass the entire UPS system for service, connecting the load directly to the bypass power source. To prevent severe equipment damage from a short circuit between the inverter output and the bypass source, the UPS5000-H incorporates electrical and mechanical interlocks. These safety features prohibit the closing of the MBS while the UPS is operating in normal (inverter) mode. The UPS must first be transferred to static bypass mode before the MBS can be safely engaged.

This is a true/false question. The statement is factually correct based on the safety and operational design of the UPS5000-H. There are no other options to evaluate.

- Huawei UPS5000-H User Manual, Section: "Operations > Switching the System Operating Mode > Switching to Maintenance Bypass Mode". The procedure explicitly states the prerequisite of transferring the UPS to bypass mode before closing the maintenance bypass switch, confirming the interlock.