Fixed-mounted circuit breaker, UL1066/IEC60947-2, FS 1, 4-poles, N-pole left, In=1200A up to 508V AC 50/60Hz, breaking capacity N, 50kA at 508V AC, Trip unit ETU300 LSIG optimized for standard applica- tions, without display Protection LT, ST, INST, GF, include N-protection, (internal N-sensor available), incl. trip/bell alarm (1xCO), rear vertical connection,