What is the maximum amperage rating of the engine-driven generators?

What is the maximum amperage rating of the engine-driven generators?

• A. 200 amps
• B. 600 amps
• C. 800 amps
• D. 400 amps

Answer: (D)

The key idea is that engine-driven generators have a highest current they can safely deliver, which, together with system voltage, sets how much power they can provide to the airplane’s electrical system. On the ERJ-145, each engine-driven generator is rated to supply up to 400 amperes at 28 volts. That means about 11.2 kW per generator, enough to power critical systems, avionics, lights, and air conditioning, and to handle inrush loads during engine start and high-demand periods. Having two generators allows load sharing and redundancy, but each one must stay within its 400 A limit to avoid overloading, overheating, or tripping protective devices. The other values would either understate the capability, risking insufficient power, or exceed what the system is designed to safely handle.

The key idea is that engine-driven generators have a highest current they can safely deliver, which, together with system voltage, sets how much power they can provide to the airplane’s electrical system. On the ERJ-145, each engine-driven generator is rated to supply up to 400 amperes at 28 volts. That means about 11.2 kW per generator, enough to power critical systems, avionics, lights, and air conditioning, and to handle inrush loads during engine start and high-demand periods. Having two generators allows load sharing and redundancy, but each one must stay within its 400 A limit to avoid overloading, overheating, or tripping protective devices. The other values would either understate the capability, risking insufficient power, or exceed what the system is designed to safely handle.