The ME09 air‑circuit‑breaker is available in three basic frame current ratings. Its rated current ranges from 400 A to 6400 A, with 3‑pole and 4‑pole versions offered. The full product series provides multiple breaking‑capacity classes, and its rated operating short‑circuit breaking capacity equals 100 % of the rated ultimate short‑circuit breaking capacity (Ics = 100 % Icu).

• Frame 1: rated current ranges from 400 A to 2500 A, no derating required at 50 °C. Rated operational voltage up to 690 V. Breaking‑capacity (Ics = Icu) ratings: 50 kA and 65 kA.

• Frame 2: rated current ranges from 800 A to 4000 A, no derating required at 50 °C. Rated operational voltage up to 690 V. Breaking‑capacity (Ics = Icu) ratings: 65 kA and 80 kA.

• Frame 3: rated current ranges from 5000 A to 6400 A, no derating required at 50 °C. Rated operational voltage up to 690 V. Breaking‑capacity (Ics = Icu) rating: 100 kA.