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Chapter 2.0: General Description
2.1: Mondel type MST/E spring applied, Hy-Thrust actuated general purpose brakes are designed for
use on cranes and other severe braking applications in heavy industry. They can be used with
any drive type applied to hoisting or horizontal travel motions.
2.2: There are two basic models of this versatile, high-speed, AC operated brake: Type MST with
fixed value internal torque spring, and Type MST/E with an adjustable external torque spring.
2.3: The type MST brake spring is contained within the actuator. The brake can be arranged to
deliver a percentage of the maximum torque by rearranging the brake pivot pins to provide a
different lever ratio.
2.4: The type MST/E has an external torque spring, which is infinitely adjustable down to less than
50% of maximum torque.
2.5: Construction and operation of both models is similar; they are available for wheel sizes 6” to 16”.
A limited range of shunt-wound DC motor actuators is available.
2.6: A wide range of options is available; consult factory.
2.7: When the load cycle requires a larger than normal size, as is frequently the cause on crane
bridge drives, type MST and MST/E brakes can be provided with torques lower than traditional for
a given wheel size.
Except when specifically engineered and used in conjunction with Mondel Braketronic
Controllers, type MST/E are more suited to crane bridge brakes.
2.8: The type MST and MST/E brakes can be supplied as “drop-ins”, with footprints and shaft heights,
to replace a wide range of competitor’s brakes, including some metric sizes.
2.9: The standard actuator is weatherproof and dust proof. The electric motor is TENV construction,
and the hydraulic section is fully sealed and self-contained. Electric motors for certain hazardous
areas are available as options.
2.10: An optional breather unit can be installed to replace the standard filler plug for environments,
which experience large temperature swings. The breather prevents pressure build-up within the
actuator.
2.11: For more demanding environments, special hardware, enclosures, paint and surface treatments
are available.
IF YOU HAVE AN UNUSUAL APPLICATION, OR REQUIRE A RECOMMENDATION FOR A BRAKE
SIZE AND TYPE CONTACT MAGNETEK.
8/17/2006 Page 7 of 33 MST/E Electric Shoe Brakes Manual
560022-R6