A surgical apparatus includes a handle, an elongate member and a switch actuator. The switch actuator includes an activation link and a switch plunger coupled to the activation link. An electric switch is mounted to the elongate member. A rotatable lock member is mounted to the elongate member and adapted for rotational movement between an unlocked condition and a locked condition. The rotatable lock member includes an actuator stop dimensioned to operatively engage the switch actuator to prevent movement of the switch actuator from a first longitudinal position to a second longitudinal position when in the unlocked condition, and to permit movement of the switch actuator to the second longitudinal position when rotated to the locked condition such that the switch plunger activates the switch. A loading unit is releasably couplable to the rotatable lock member and is secured relative to the elongate member when the rotatable lock member is in the locked condition.
