The SB400 safety brake is a normally-closed, spring-applied, hydraulically-released heavy-duty disc brake, primarily used as an emergency/holding brake for low-speed shafts in cranes, port machinery, mine winders, and belt conveyors, with fail-safe operation as its core advantage. It offers higher braking torque than the SB315, rapid response, integrated safety interlocks, and durable friction components for harsh industrial environments.
Core Technical Specifications
| Parameter | Typical Value | Notes |
|---|---|---|
| Braking Principle | Spring-applied, hydraulic-released (normally closed) | Fail-safe: brakes on power loss/hydraulic failure |
| Disc Diameter | 400 mm | Standard for SB400 series |
| Rated Braking Torque | 3000–6000 N·m | Adjustable via spring preload |
| Clamp Force | 60–90 kN | Depends on model variant |
| Release Pressure | 12–18 MPa | Matches standard hydraulic power units |
| Brake Clearance | 0.8–1.2 mm | Manual or automatic adjustment |
| Friction Lining | Non-asbestos hard material | Friction coefficient ≥0.35, water/salt resistant |
| Limit Switches | Release + wear limit | PLC interlock for safety shutdown |
| Working Temp | -25℃ to +50℃ | Suitable for most industrial sites |
| Protection Class | IP54/IP55 | Dustproof and water spray resistant |
| Weight (w/o bracket) | ~60–75 kg | Compact for easy mounting |
Key Structural & Functional Features
Fail-Safe Normally-Closed Design
Spring-set braking: disc springs provide constant clamping force when hydraulic pressure is off, ensuring immediate braking on power loss or system failure.
Hydraulic release: pressure pushes the piston to overcome spring force, separating pads from the disc for equipment operation.
Fast response: typical braking time ≤0.6 s, release time ≤0.4 s.
Integrated Safety Interlocks
Equipped with release limit switches and wear limit switches for real-time monitoring of brake status.
Interlocks with PLC systems to prevent equipment operation if the brake is not fully released or linings are worn beyond safe limits.
Durable Friction Components
Non-asbestos hard friction linings offer stable performance, high wear resistance, and insensitivity to water, salt, and other environmental factors.
Excellent sealing ensures long service life even in harsh conditions.
Easy Installation & Maintenance
Compact design with standardized mounting interfaces for straightforward installation.
Simple adjustment of spring preload and brake clearance, with accessible components for quick maintenance.
Applications
Cranes and hoists (lifting and luffing mechanisms)
Port handling machinery (container cranes, gantry cranes)
Mine winders and elevators
Belt conveyors and cable cars
Foundry and heavy industrial equipment requiring reliable emergency braking
Installation & Maintenance Tips
Mounting
Ensure the brake is aligned with the disc to avoid uneven wear and noise.
Use torque wrenches to tighten bolts to manufacturer specifications.
Adjustment
Set spring preload according to the required braking torque.
Maintain brake clearance within 0.8–1.2 mm to ensure optimal performance.
Inspection
Regularly check friction lining wear and replace when thickness is below the minimum limit.
Verify limit switch functionality and hydraulic system pressure for consistent release.
Lubrication
Lubricate guide pins and moving parts periodically to prevent corrosion and ensure smooth operation.
The SB400 safety brake combines robust construction with advanced safety features, making it an ideal choice for critical applications where reliable emergency braking is essential. Its high torque capacity and durable design ensure long-term performance in demanding industrial environments.
