Competitive Comparison
| Model | Thrust | Stroke | Ex protection | Standard / mount | Best fit |
|---|---|---|---|---|---|
| BYT1-45Z/6 | 450 N | 60 mm | Ex d I Mb + IIB T4 | Legacy JB/ZQ (YT1 bolt pattern) | Mine / gas Zone, drop-in legacy |
| BEd30/5 (防爆 Ed) | 300 N | 50 mm | Ex (modern Ed) | Modern DIN / JB/T 10603 | New Ex equipment, lower thrust |
| YT1-25ZC/4 | 250 N | 40 mm | None (IP54) | Legacy JB/ZQ 4388 | Non-hazardous, cushioned return |
| Ed30/5 | 300 N | 50 mm | None (IP65) | Modern DIN 15430 | Non-hazardous general duty |
✓ Choose BYT1-45Z/6 when
Hazardous area (methane, coal dust, IIB gas) - Ex certification is mandatory.
Existing YT1 / JB/ZQ 4388 bracket - direct swap, no rework.
Supply is 380 / 660 / 1140 V mine-standard.
Pairing with BYWZ / BJZ / BYZ explosion-proof drum brakes.
✗ Do NOT choose when
Area is non-hazardous - Ed30/5 or YT1-25ZC/4 is cheaper & lighter.
You need long stroke / high thrust - step up to BYT1-90Z/8, 180Z/12 or 320Z/20.
You need a standalone actuator (this is a brake accessory, not a cylinder-with-rod - see DYTZ700 for that).
Working Principle & Safety Logic
① ENERGISE
Motor spins centrifugal pump → oil pressure in cylinder rises
→
② EXTEND
Piston + push rod rise rapidly → lever compresses brake spring → BRAKE RELEASES
→
③ DE-ENERGISE
Pump stops, pressure drops → return spring + gravity retract rod → BRAKE LOCKS
Structural fail-safe: the spring wants the brake locked 100% of the time. Hydraulic pressure is the only thing that overcomes it. Power loss, cable break, short circuit and pump failure all converge on the same safe state - locked. This is why the thruster must never be welded, pinned or bypassed in the extended position.
Installation & maintenance rules
Mount vertically; allowable tilt ≤ 10° from vertical.
Fill oil before first run (units typically ship dry); use the specified hydraulic oil for the ambient range.
Check oil level via sight plug periodically; change per duty-cycle schedule (heavy S1/S3 mine service = shorter interval).
Do not weld, tie or block the push rod - destroys fail-safe behaviour.
Verify Ex cable gland tightness and flameproof joint gap at every inspection (methane ingress invalidates certification).
