Comparison - Explosion Drum Brakes
| Feature | DYW250-400 | BYWZ5 (legacy Ex) | YWZ5 (standard) | YWZ4-200 |
|---|---|---|---|---|
| Drum Ø | Ø250 | Ø250 | Ø250 | Ø200 |
| Torque class | 400 (315–500) | 400 | 400 | ~200 |
| Whole-brake Ex cert | Yes (body + thruster) | Yes (older) | No | No |
| Thruster | BEd50/6 | BEd / BYT1 | Ed50/6 | Ed30/5 |
| Auto wear compensation | Yes | Limited | Yes | Yes |
| Equal clearance | Yes (linkage) | Partial | Yes | Yes |
| Mounting holes | Same as BYWZ5/YZW5 | Reference | Same | Smaller |
| Typical application | Mine conveyor / Ex crane | Legacy mine | General crane | Light crane |
One-line decision
DYW250-400 = BYWZ5-level Ex protection + modern auto-compensation and equal-clearance linkage, on the same mounting envelope as YWZ5/BYWZ5. If the project needs a certified Ex assembly and the wheel is Ø250 → DYW250-400. If no Ex zone → save cost with YWZ5-400.
Installation - do / don't
Must do
Mount on horizontal, rigid base; align to brake wheel center
Set equal clearance on both shoes (linkage adjusted)
Confirm Ex certificate matches project Zone / gas group
Verify thruster voltage (380/660/1140V) before energizing
Never do
Weld or tie the push-rod - destroys fail-safe
Run without Ex certificate matching the gas group
Reverse shoe lining material (must be Ex-rated)
Adjust spring preload beyond 315–500 N·m range
