YW-K500/E121 Series Normally-Open Electro-Hydraulic Drum Brake

YW‑K500/E121 Series is a normally‑open, electro‑hydraulically actuated drum brake specially designed for frequent service braking in cranes, hoists, conveyors and other mechanical transmission systems.

Basic Identification

Model: YW‑K500/E121 Series

Type: Normally‑open electro‑hydraulic drum brake

Brake drum diameter: 500 mm

Actuator: E121 series electro‑hydraulic thruster

Operation mode: Normally open → brakes when powered

Working Principle

Normally open (power off):Brake shoes are retracted; no braking force.

Braking (power on):The electro‑hydraulic thruster pushes the brake arms to close the shoes and apply braking torque.

Suitable for active service braking rather than fail‑safe holding.

Key Features

Normally‑open structure, dedicated for frequent working braking

Fast response, stable braking force

Adjustable braking torque and shoe clearance

Asbestos‑free friction linings, long service life

Low noise, reliable for heavy‑duty operation

Easy installation and maintenance

Typical Applications

Hoisting and luffing mechanisms on cranes

Winches, conveyors and metallurgical machinery

Equipment requiring service braking during operation

Mechanical systems with active braking control

Short version 

YW‑K500/E121 series normally‑open electro‑hydraulic drum brakes are 500 mm drum diameter service brakes, actuated by E121 thrusters for frequent braking in cranes and industrial machinery.

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