MD5011: 1/2 HP Medium Duty Drawbar Commercial Door Operator

The Nortek Security & Control Family of Brands

Installation and Owner’s Manual –
(Post 2010 UL requirements)
Flyer/Architectural Spec
Fraba Safety Devices Brochure

The Model MD5011 is a 1/2 HP, 115-volt, medium duty drawbar commercial door operator (for standard lift sectional doors) with a 12-foot rail. Not to exceed 10 cycles per hour, 75 cycles per day.


  • 115 VAC, Single phase, 1/2 HP only
  • Maximum duty cycle: 10 cycles per hour, 75 cycles per day
  • Maximum door height: 14 feet


  • Solid state control circuit¬†
  • Constant pressure required to close if no entrapment devices are installed¬†
  • All steel frame
  • V-Belt drive from motor to clutch shaft
  • Adjustable friction clutch
  • Full #65 roller chain drive
  • Quick release door arm for manual door operation
  • Standard door speed is approximately 11 inches per second
  • Standard rail and chain assembly for door up to 12′ 6″ high
  • Motor overload protection
  • Wired to accept reversing devices
  • Internally adjustable limit switches
  • 1/2 HP rigid base permanent split capacitor motor
  • 24-Volt control circuit with OPEN, CLOSE and STOP 3-button station
  • OPEN button (and single button) will automatically override down travel and reverse door to the full open position
  • External terminals for single button (residential type) radio control

Additional Rail

  • Rail for up to 14′ 6″ high door

Common Options

  • Linear Photo Beam Kit: HAE00056
  • Solenoid brake: Add -BK to model number
  • MVP-MR 3-channel open-close-stop modular receiver installed: P/N 2650-159


  • 2 years
MD50111/2115V 1PDrawbar
Quick release door arm
14 FT.