Fixed-mounted circuit breaker, UL1066/IEC60947-2, FS 3, 4-poles, N-pole left, In=4000A up to 635V AC 50/60Hz, breaking capacity M, 85/65kA at 508/635V AC, Trip unit ETU300 LSI optimized for standard applica- tions, without display Protection LT, ST, INST, include N-protection, (internal N-sensor available), incl. trip/bell alarm (1xCO), rear vertical connection,