ZWZA300-250 Electromagnetic Drum Brakes

ZWZA300-250 electromagnetic drum brakes

The ZWZA-250/300 is a DC Electromagnetic Block Brake. It is a heavy-duty, "normally closed" braking system designed for industrial applications requiring high torque and reliable holding power. The model number indicates the physical size of the brake wheel and the power of the electromagnetic actuator.

The model number breakdown is as follows:

ZWZA: The series designation for DC Electromagnetic Block Brakes.

250: The Brake Wheel Diameter of 250 mm.

300: The Rated Thrust of the Electromagnet, which is 3000 N (approx. 300 kgf).

💡 Key Features & Characteristics

DC Electromagnetic Actuation:

Power Supply: This series typically operates on DC 220V (often requiring a rectifier if connected to AC mains).

Operation: It is a normally closed brake.

Braking (Power Off): A main compression spring applies force to the brake shoes, clamping the drum to stop or hold the load.

Releasing (Power On): When DC power is applied, the electromagnet generates a magnetic field that pulls the armature, compressing the spring and retracting the shoes to release the drum.

High Torque Capability:

Thrust: The "300" designation indicates a powerful 3000 N thrust force.

Torque: According to technical data for the ZWZA-250/300 model, the rated braking torque is approximately 450 N·m (at 25% duty cycle) or 355 N·m (at 40% duty cycle).

Maintenance-Free Linkage:
The main pivot points are equipped with self-lubricating bearings. This design eliminates the need for manual greasing, reduces wear, and ensures smooth operation in dusty environments.

Adjustable Performance:

Torque Adjustment: The main spring compression can be adjusted to vary the braking torque.

Stroke: The brake shoe clearance (stroke) is adjustable (typically around 3 mm to 4.5 mm for this size), allowing for consistent performance as the linings wear.

Robust Construction:
Designed for harsh industrial environments, the brake features a heavy-duty cast or welded steel frame capable of withstanding high vibration and shock loads.

🏭 Typical Applications

The ZWZA-250/300 is used in medium-to-heavy industrial applications where DC control is preferred:

Metallurgy: Steel rolling mills and heavy cranes.

Port Machinery: Gantry cranes and loaders.

Mining: Conveyors and hoists.

Construction: Tower cranes and material lifts.

General Industry: Transportation machinery and chemical drive units.

📋 General Technical Specifications

Note: The ZWZA series is distinct from the TJ2 or JZ series primarily due to its DC power requirement. Ensure your electrical cabinet has the appropriate rectifier or DC power supply. The "250/300" configuration is a high-thrust setup for a 250mm wheel, providing strong holding power for heavy loads.

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