Full definition
Electromechanical braking device using an electromagnetic coil to engage or release friction surfaces. Two main configurations: (1) Power-on (spring-released): coil energized to brake, springs release — used for dynamic stopping. (2) Power-off (spring-applied, fail-safe): springs apply braking force, coil energization releases — critical for cranes, hoists, elevators, and servo motors where the brake must hold on power loss. Response time: engagement 15-50 ms, release 20-100 ms depending on size. Torque range: 0.5-5,000 Nm. Air gap adjustment required as friction lining wears (typical: 0.2-0.5 mm initial). Per IEC 60947-4. Brands: Mayr, Lenze, Warner Electric, Stromag, Intorq. Coil voltage: 24 VDC common for industrial, 205 VDC for larger sizes.