The ROBA-stop M Size 60 Type 891.104.1 S Safety Brake (Article No: 8227854-1) is a high-performance electromagnetic fail-safe brake manufactured by Mayr Power Transmission (Germany) – the global leader in safety brakes and motion control solutions.

1. Fail-Safe Operational Principle:
Operating on the proven spring-applied principle, the ROBA-stop M ensures absolute safety. Under power-off conditions or in the event of emergency power failure, pre-stressed helical springs apply pressure to the armature disk, instantly generating a powerful holding braking torque of 100 Nm to secure the motor shaft or load. When 24 Vdc power is supplied to the electromagnetic coil, the magnetic field overrides the spring force, releasing the brake rotor completely for frictionless rotation.

2. Special Custom Design Features:
Engineered tailored to Mayr's specialized technical drawing No. E07006274000210, this custom version incorporates premium mechanical modifications:
- Threaded Holes in Coil Carrier: Specially machined mounting holes directly on the coil carrier body for direct, rigid, and precise alignment on motor housings or machine frames without needing extra mounting adapters.
- Precision Hub Bore: Precision-machined hub bore of Ø30 mm with H7 tolerance fit, designed to withstand high radial loads and torque transmission.
- Integrated Cabling: Factory-installed heat-resistant power connection cables measuring 400 mm in length for seamless control cabinet wiring.

3. Key Advantages & Industrial Applications:
- Exceptional mechanical wear resistance and thermal endurance due to advanced friction lining material.
- Fast switching times providing rapid engagement and disengagement during high-frequency stop-start duty cycles.
- Widely utilized in vertical Z-axes of CNC machines, industrial hoists, AGV/AMR warehouse automation, robotic pick-and-place units, and safety-critical drive engineering systems.

• Manufacturer: Mayr (Mayr Power Transmission)
• Product Series: ROBA-stop M Safety Brake
• Frame Size: Size 60
• Type Designation: 891.104.1 S
• Article Number (Art-No): 8227854-1
• Nominal Braking Torque: 100 Nm
• Operating Voltage: 24 Vdc
• Precision Hub Bore: Ø30 mm (H7 tolerance fit)
• Power Cable Length: 400 mm
• Special Mechanical Feature: Integrated threaded mounting holes in coil carrier
• Technical Drawing Specification: Drawing No. E07006274000210
• Operating Principle: Spring-applied electromagnetic fail-safe brake
• Quality Standards: ISO 9001, CE compliant, international industrial safety standards