Friction brake unit WL series

springmanual releaseelectromagnetic release

Product overview
A power-off brake is a spring-applied, electrically released fail-safe braking device for industrial and automation equipment. When power is applied the electromagnetic coil generates magnetic force to release the brake and allow normal motor operation. When power is interrupted internal springs automatically engage the friction plates to stop or hold the rotating shaft. The design is compact and modular for direct integration with motor shafts or gear reducers, providing stable torque output and fast response.

Key features

• Fail-safe spring-applied, electrically released design
• Rapid power-off braking response time (≤ 0.2 s stated)
• Stable and consistent braking torque
• Compact, modular construction for direct installation on motor or reducer shafts
• Durable, asbestos-free friction plates
• IP-rated housings for dust and moisture protection (example: IP54)
• Low-power coil options and simple electrical control
• Optional manual release for maintenance
• Over-temperature protection function

Performance & design

• Rapid engagement on power loss to prevent uncontrolled movement
• Designed for frequent start-stop cycles with high reliability
• Available in modular sizes and torque ranges to suit different shafts and mounting arrangements
• Thermal considerations recommended for high duty-cycle applications

Applications

• Automation lines: conveyors, packaging machines, robotic systems for emergency stopping and precise positioning
• CNC machinery: axis positioning and tool protection
• Hoists, cranes, elevators and lifting equipment for secure holding during power interruptions
• Renewable energy: rotor stopping and maintenance (e.g., wind turbines)
• Automated guided vehicles (AGVs), stacker cranes and warehousing systems
• Textile, printing, food processing and other industrial equipment requiring precision stopping and load-holding

Advantages

• Automatic fail-safe engagement on power loss
• Fast response and stable torque for precise stopping
• Compact integration with motors and gear reducers
• Durable friction materials and low maintenance requirements
• Simple control and multiple voltage options

Disadvantages / considerations

• Friction components wear over time and require periodic inspection and replacement
• Heat generation during frequent braking cycles; requires proper thermal design and duty-cycle assessment
• Some models may produce noise during engagement
• Requires continuous power to remain released, implying minor continuous energy consumption during operation

How to select a power-off brake

• Determine required braking torque: calculate maximum load torque from motor power, speed and transmission ratios, then apply a safety factor (commonly 1.5–2× for vertical loads)
• Verify shaft diameter, keyway and mounting configuration to match brake hub and installation space
• Confirm electrical specification: choose voltage/coil compatible with control system (examples: 24VDC, 48VDC, 110VAC, 220VAC)
• Assess duty cycle and thermal performance: for frequent cycles select higher heat dissipation capacity and robust friction materials
• Consider environmental rating: select IP54 or higher for dusty/humid conditions; choose coated or stainless housings for corrosive environments
• Review safety standards, certifications and torque/temperature curves as required

Technical specifications

• Operation principle: spring-applied (engage on power loss), electrically released (coil holds brake open)
• Typical response time: ≤ 0.2 seconds (power-off braking)
• Friction material: asbestos-free wear-resistant plates
• Protection rating: example IP54 (dust and moisture protection)
• Protection features: over-temperature protection
• Voltage options (examples): 24VDC, 48VDC, 110VAC, 220VAC
• Low-power coil options and optional manual release for maintenance
• Mounting: modular design for direct installation on motor or reducer shaft ends