B767-400 CAPT ACCIDENTALLY TURNED OFF THE STANDBY ELECTRICAL SWITCH; INSTEAD OF THE FORTIFIED COCKPIT DOOR UNLOCK SWITCH. THE COCKPIT DOOR SWITCH IS JUST ABOVE THE STANDBY POWER ELECTRICAL SWITCH AND BOTH ARE OF SIMILAR DESIGN.

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I WAS FLYING ONE OF THE FIRST OF OUR B767-400 ACFT TO BE EQUIPPED WITH THE NEW SECURE COCKPIT DOOR. THE FO HAD GONE TO THE BACK. I WAS SITTING THERE IN MY FULL FACE OXYGEN MASK THINKING THAT WHEN THE FO CALLED TO RETURN; I NEEDED TO SELECT CABIN MIC TO BE ABLE TO TALK TO HIM. HE CALLED AND I SELECTED CAB MIC AND ANSWERED HIM. I THEN RESELECTED MIC FOR VHF #1 AND HEARD HIM KNOCK. I REACHED UP TO UNLOCK THE DOOR; BUT INSTEAD TURNED THE STANDBY ELECTRICAL POWER SWITCH TO OFF. THE AUTOPLT AND AUTO THROTTLES DISENGAGED. I IMMEDIATELY REALIZED WHAT I HAD DONE AND RETURNED THE STANDBY POWER SWITCH TO AUTO. I MANUALLY TOOK CONTROL OF THE ACFT AND MOVED THE COCKPIT DOOR SWITCH TO UNLOCK. BOY DID I FEEL FOOLISH! THE NEW COCKPIT DOOR CTLR IS JUST ABOVE THE STANDBY POWER SWITCH AND BOTH SWITCHES ARE SIMILAR. THE THING THAT DISTURBS ME THE MOST ABOUT THIS INCIDENT IS THE CAPT'S INBOARD DISPLAY WAS INOP FOR THE REMAINDER OF THE FLT AFTER THE POWER INTERRUPTION. AT THE LEAST; I FEEL THE CREW BULLETIN DESCRIBING THE OP OF THE COCKPIT DOOR CTLR SHOULD WARN OF THE CLOSE PROXIMITY AND SIMILARITY OF THE TWO SWITCHES. NEEDLESS TO SAY; I SHOULD MAKE SURE THE SWITCH I HAVE SELECTED IS THE CORRECT SWITCH.