Product description:
Siemens WLS2F312 circuit breaker; cat # S2F312KVXXXXXBN, 1200 amp, 600 volt AC, 3 pole, 600 amp rating plug, manually operated (M/O), fixed-mount (F/M). With ETU776 trip unit. Used tested with report.
MC-CB# 1837-- LOC: S5F2 MC-CB # 1858 -- LOC: S5E1
MC-CB # 2142 -- LOC: S3F1