A clutched joint module (106a-d) of a robotic assembly , comprising: an output member operable to couple to a first support member (104a-d) of a robotic system; an input member operable to couple to a second support member (104a-d) of the robotic system; a primary actuator operable to apply a primary torque to the output member to rotate the first and second support members relative to one another about an axis of rotation of the clutched joint module; a quasi-passive elastic actuator coupled to the input member and operable to apply an augmented torque to the output member that combines with the primary torque applied by the primary actuator to rotate the output member about the axis of rotation; and a clutch mechanism operably coupled to the primary actuator and the quasi-passive elastic actuator, the clutch mechanism operable in an engaged state, a semi-engaged state, and a disengaged state, the clutch mechanism comprising: a clutch housing coupled to the input member; a plurality of input plates retained by the clutch housing; a plurality of output plates rotatably supported by the clutch housing and rotatably interfaced with the plurality of input plates in an alternating manner; and an electromagnetic actuator coupled to the clutch housing and operable to apply selective, variable compression to the output plates and the input plates to cause the clutch mechanism to function in the engaged or semi-engaged state where at least one of a braking force is generated or the augmented torque is applied to the output member; wherein, in the engaged state, the clutch mechanism operates to place the quasi-passive elastic actuator in an elastic state, and to facilitate application of the augmented torque, and wherein in the disengaged state, the clutch mechanism operates to place the quasi-passive elastic actuator in an inelastic state. an output member operable to couple to a first support member (104a-d) of a robotic system; an input member operable to couple to a second support member (104a-d) of the robotic system; a primary actuator operable to apply a primary torque to the output member to rotate the first and second support members relative to one another about an axis of rotation of the clutched joint module; a quasi-passive elastic actuator coupled to the input member and operable to apply an augmented torque to the output member that combines with the primary torque applied by the primary actuator to rotate the output member about the axis of rotation; and a clutch mechanism operably coupled to the primary actuator and the quasi-passive elastic actuator, the clutch mechanism operable in an engaged state, a semi-engaged state, and a disengaged state, the clutch mechanism comprising: a clutch housing coupled to the input member; a plurality of input plates retained by the clutch housing; a plurality of output plates rotatably supported by the clutch housing and rotatably interfaced with the plurality of input plates in an alternating manner; and an electromagnetic actuator coupled to the clutch housing and operable to apply selective, variable compression to the output plates and the input plates to cause the clutch mechanism to function in the engaged or semi-engaged state where at least one of a braking force is generated or the augmented torque is applied to the output member; wherein, in the engaged state, the clutch mechanism operates to place the quasi-passive elastic actuator in an elastic state, and to facilitate application of the augmented torque, and wherein in the disengaged state, the clutch mechanism operates to place the quasi-passive elastic actuator in an inelastic state. <EOS>