In one embodiment, a surgical instrument comprises a handle assembly. The handle assembly comprises a first translatable member defining a notch, a lockout lever comprising a cam surface and a detent, a closure trigger, a jaw position sensor comprising a switch in a first state, and a translatable cam operatively coupled to the closure trigger. The detent of the lockout lever is configured to engage the notch of the first translatable member. In response to actuation of the closure trigger, the translatable cam is configured to slidably interface with the cam surface of the lockout lever to cause the lockout lever to: (i) disengage the detent of the lockout lever from the notch of the first translatable member, and (ii) actuate the jaw position sensor switch to a second state.