Basler Electric BE3-74SL-7F5A2 9320800100 (155-2) Trip Relay is a BE3-series protective relay component used in electrical protection schemes for generators and transformers. The BE3-74SL, along with BE3-74SH and BE3-74SD, is documented in instruction manual 9320800990 Rev C for installation, operation, and testing. Basler's BE3 series options have been discontinued and are superseded by ES-series protection relays. The manual describes input connections for BE3-74SH, BE3-74SL, and BE3-74SD and provides guidance on applying trip voltage and timing checks.
