LiftMaster SUB300K

  • LiftMaster branded underground double gate opener kit
  • Extremely quiet and smooth operation
  • Clean and maintenance-free
  • Suitable for gate leaves up to 600kg (with a 2.5m gate leaf)

Unfortunately, this product has either been discontinued, or we no longer stock it.

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SKU: SUB300K Category: Tag:


LiftMaster SUB300K 230v double underground gate opener kit, part of the LiftMaster SUB series. Motors in this kit support gates that are up to 4.0m in length, with a smaller gate length (2.5m) it allows for support of a gate up to 600kg in weight.

Extremely quiet motors with clean, maintenance-free operation make this system ideal for residential and commercial use.


Smart Solutions:

  • Powerful performance thanks to underground drive system
  • Installed under the gate, set in secrecy, great for installations that don’t affect the aesthetic of a stylish gate
  • Smooth operation thanks to soft-start / soft-stop technology, resulting in no harsh banging/clattering of gates
  • Can be partially opened with the pedestrian mode for times when the full opening is not required
  • Includes built-in stops, no ground stops needed

Reliable and Quiet:

  • Extremely quiet AC motor eliminates noise and vibrations to provide smooth operation
  • Made from high-quality materials, providing a long service life
  • Clean and maintenance-free electro-mechanical motors ensure less hassle
  • Strong and resistant design

Safe and Secure:

  • Timer-to-close function to automatically closes the gate after a preset amount of time
  • Rolling code radio (security+) transmits a new code with every click of the remote
  • 8.2K safety circuit input for connection of safety edges
  • Separate force setting per gate wing
  • Ideal for gates in residential areas

What’s Included:

  • 2 x SUB300M electro-mechanical underground gate motor (230v)
  • 2 x SUB300B zinc coated, rust-resistant foundation box
  • 2 x SUB-110 110° opening gate arm with stops and release keys
  • 1 x CB11 control panel
    • Radio Board: 801221
  • 2 x TX4UNIS 433 MHz, 2 channel remote controls
  • 1 x 772E pair of adjustable failsafe photocells

Manuals & Guides:

Product Specifications

Physical and Performance Attributes

Weight35 KG
Dimensions (L x W x H)345 × 420 × 225 mm

Click Diagram To Enlarge

LiftMaster SUB Series Typical Installation

LiftMaster SUB Series Typical Installation

LiftMaster SUB Series Motor and Foundation Box Dimensions

LiftMaster SUB Series Motor and Foundation Box Dimensions

LiftMaster SUB Series Installation Dimensions

LiftMaster SUB Series Installation Dimensions

Protection Rating (IP)67
Operating Temperature-20°C to +55°C

Electronics Attributes

Max Absorption2.1 A
Max Power300 (nominal), 350 (max)
Power Supply230 - 240v AC (50 / 60 Hz)

Motor Attributes

Duty Cycle / Work Cycle

60 Cycles Per Day

Motor Voltage230v
Safety Edge Input8K2OHM
Automation TypeUnderground
Kit TypeDouble
Max. Gate Leaf Length (M)4M
Max. Gate Weight (KG)600KG
Motor Model Number(s)


Number of Leafs2
Max Opening Angle110°