SMAA model Magnetic DC Voltage Drum Brake

Spring applied / Electrically Released


GDA500 General Duty DC Magnet Drum Brakes

Spring applied / Electrically Released, US Navy High Speed Hoist Brakes

Spring Set DC electrically Released Drum Brakes:

Industry Type:

  • General Industrial Code, Prefix: GDA
  • Steel Industry Standard, Prefix: SDA
  • High Integrity Nuclear, Prefix: HDA


  • Metric as DIN standard code: DL
  • Imperial as A.I.S.E. standard code: SMAA
  • Also non-standard drum sizes and base fixings


  • Fabricated steel mechanism
  • Ductile iron brake shoes
  • Major pivots non-ferrous bushed
  • All pins ground stainless steel (lubricators optional)
  • Friction linings high temperature non asbestos


  • -DC tractive type with encapsulated coil

Special Options:

  • Self adjusting mechanism (compensating for wear)
  • Mechanical release lever
  • Limit switches to monitor release/ set or wear
  • Hydraulic override by remote pedal
  • Special materials and finishes as required including high integrity specifications
  • Separate enclosed control units for DC or AC supplies


  • Mechanical handling equipment, cranes, winches, elevators, lifts, also rolling mills, mixers etc.


  • Design and selection assistance available always

    DIN Brake Model Data:

    DIA. “D”
    mm Nm kg
    GDA100 100 DA100 32 11
    GDA160 160 DA160 80 28
    GDA200 200 DA200 213
    GDA250 250 DA250 362 64
    GDA315 315 DA315 565 100
    GDA400 400 DA400 1487 246
    GDA500 500 DA500 1900 264
    GDA630 630 DA630 5885 620



    AISE Brake Model Data:

    DIA. “D”
      in   Lbft Lb
    SMAA4 4 DA100 24 25
    SMAA6 6 DA160 59 62
    SMAA8 8 DA200 157 101
    SMAA10 10 DA250 267 141
    SMAA13 13 DAH315 626 220
    SMAA16 16 DA400 1097 542
    SMAA19 19 DAH500 2620 816
    SMAA23 23 DA630 4000 1367
    SMAA30 30 DA710 9000 1500

    Magnetic Brake Actuator Data:

    • Short stroke DC tractive type, all fabricated steel construction
    • Resin encapsulated coil with Class F insulation
    • Optional replaceable coil arrangement
    • 100% continuously rated up to 40ºC
    • Airgap dust and drip protected by neoprene qaiter
    • Terminal Box IP55 standard enclosure

    Brake Selection:

    Characteristics of DC Magnetic Drum Brakes

    All DC magnets tend to inherently show reponse due to build up and decay of the magnetic field. The actual times are dependent on brake magnet size and vary with excitation voltage, coil temperature and spring loading (torque). The magnet stroke which increases as the brake linings wear will also influence set and release times.

    Coil Forcing DC Magnets (Shunt wound voltage operated)

    Brake release and set times can be reduced by using an economy circuit. This separate brake control unit will initially apply full voltage to release the brake magnet, after a set time period the circuit will drop voltage to only hold off the brake. Control units are enclosed ventilated drip proof IP22 for DC supplies or totally enclosed IP55 with rectifier for 1 or 3 phase AC supplies.

    Series Wound DC Magnets (Current Operated, usually inline with motor drive)

    For use with crane rated DC series hoist motors to release the brake at 40% motor full load current and hold off at 10% current.
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