The "Top" variant upgrades from standard 6204 deep-groove ball bearings to high-clearance C3 bearings with heavy-duty grease (e.g., Mobil Polyrex EM). For the 524 frame, the drive-end bearing is often larger (6305) to handle belt tension or gear coupling forces.
Model: ESA VTwin (Safety Light Curtain) Protected Height: 524 mm Number of Beams: 36 (This determines the resolution/protection level). Resolution: Typically 14mm or 30mm depending on the specific sub-version. esa vtwin 524 36 top
Note: "Top" usually refers to the mounting bracket orientation or identifying the unit as the top half of a cascaded system. The "Top" variant upgrades from standard 6204 deep-groove