System for separating breast meat from at least a part of a keel bone of a carcass part of slaughtered poultry, which carcass part comprises: - a keel bone, which has a longitudinal direction and a first flank and a second flank which both extend generally in the longitudinal direction of the keel bone, - breast meat which is located against the first flank of the keel bone, and breast meat which is located against the second flank of the keel bone, which system comprises: - a product carrier for supporting the carcass part, which product carrier is moveable in a transport direction along a conveying path, - a pair of breast meat cutter blades (20, 40) comprising a first breast meat cutter blade and a second breast meat cutter blade, wherein the first breast meat cutter blade is adapted to separate the breast meat from at least a part of the first flank of the keel bone by making an incision along the keel bone in the longitudinal direction of the keel bone, and wherein the second breast meat cutter blade is adapted to separate the breast meat from at least a part of the second flank of the keel bone by making an incision along the keel bone in the longitudinal direction of the keel bone, the product carrier being moveable in the transport direction relative to the breast meat cutter blades (20, 40), and wherein the first and second breast meat cutter blades (20, 40) are moveable relative to each other between and open position and a closed position, wherein the distance between the first and second breast meat cutter blades (20, 40) in a direction perpendicular to the conveying path of the product carrier in the open position is larger than in the closed position, and wherein the breast meat cutter blades (20, 40) are biased towards the closed position, - a blade actuator (35, 35*, 44), which comprises a closing assembly (25, 25*, 60) which is adapted to apply a biasing force to the first and second breast meat cutter blades (20, 40) to bias the first and second breast meat cutter blades (20, 40) towards the closed position, and an opening assembly (30, 30*, 70) which is adapted to apply an opening force to the first and second breast meat cutter blades (20, 40) to hold the first and second breast meat cutter blades (20, 40) in the open position, - a control system, which controls a release of the first and second breast meat cutter blades (20,40) from the open position when a leading tip of the keel bone has passed the first and second breast meat cutter blades (20,40). - a keel bone, which has a longitudinal direction and a first flank and a second flank which both extend generally in the longitudinal direction of the keel bone, - breast meat which is located against the first flank of the keel bone, and breast meat which is located against the second flank of the keel bone, - a product carrier for supporting the carcass part, which product carrier is moveable in a transport direction along a conveying path, - a pair of breast meat cutter blades (20, 40) comprising a first breast meat cutter blade and a second breast meat cutter blade, wherein the first breast meat cutter blade is adapted to separate the breast meat from at least a part of the first flank of the keel bone by making an incision along the keel bone in the longitudinal direction of the keel bone, and wherein the second breast meat cutter blade is adapted to separate the breast meat from at least a part of the second flank of the keel bone by making an incision along the keel bone in the longitudinal direction of the keel bone, the product carrier being moveable in the transport direction relative to the breast meat cutter blades (20, 40), and wherein the first and second breast meat cutter blades (20, 40) are moveable relative to each other between and open position and a closed position, wherein the distance between the first and second breast meat cutter blades (20, 40) in a direction perpendicular to the conveying path of the product carrier in the open position is larger than in the closed position, and wherein the breast meat cutter blades (20, 40) are biased towards the closed position, - a blade actuator (35, 35*, 44), which comprises a closing assembly (25, 25*, 60) which is adapted to apply a biasing force to the first and second breast meat cutter blades (20, 40) to bias the first and second breast meat cutter blades (20, 40) towards the closed position, and an opening assembly (30, 30*, 70) which is adapted to apply an opening force to the first and second breast meat cutter blades (20, 40) to hold the first and second breast meat cutter blades (20, 40) in the open position, - a control system, which controls a release of the first and second breast meat cutter blades (20,40) from the open position when a leading tip of the keel bone has passed the first and second breast meat cutter blades (20,40).