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Kendrion N.V.

Kendrion N.V. is a public limited liability company incorporated under the laws of the Netherlands, with its registered office in Zeist.

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Kobra safety brake

KOBRA - The brake for the green drive

Energy-saving spring-applied brake

With the launch of the KOBRA spring-applied safety brake, Kendrion Industrial Drive Systems is following the market trend towards compact drives with high power density and high torques.

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Specifications & technical details

Nominal torque rangemin. 0,2 Nm bis max. 800 Nm
Voltage24 VDC, 230 VAC, 400 VAC, 200 VAC, 120 VAC
Protection ClassIP54 und IP65

About KOBRA

KOBRA – the safety-disc brake for innovative drives

  • Holding brake with emergency stop function: spring-set technology based on proven safety engineering solution
  • Controlled braking in the event of emergency stops
  • Guaranteed high torques, up to 80% above market standard
  • Complete modular system from the full-range provider
Perfect design for the ideal drive solution.

With the launch of the KOBRA spring-applied safety brake, Kendrion Industrial Drive Systems is following the market trend towards compact drives with high power density and high torques.

  • Reduced heat generation enables installation without temperature problems.
  • All specified torque values apply right from the first use.
  • Size, torque and energy efficiency are perfectly balanced.

Physical correlations

The mode of operation and characteristics of spring-applied brakes are based on simple physical correlations. Magnetic force, for example, is proportional to the magnetic flux, which in turn is proportional to power consumption. Moreover, the magnetic force is also proportional to the magnetic permeability and hence to the inverse of the magnetic resistance. The latter is almost entirely determined by the size of the air gap. The larger the air gap is, the stronger the magnetic fi eld needs to be. Consequently, the amount of energy required for switching is high when the air gap is large, whereas it is signifi cantly lower when the air gap is small. Brake specialists at Kendrion have used precisely this correlation as a starting point in the development of the new KOBRA brake. The power density of a spring-applied brake results from the interaction between torque and permitted wear and/or lifecycle. In this interaction, the torque is proportional to the spring force, and the permitted wear is proportional to the difference between the rated air gap and the air gap at the wear limit, which is equivalent to the point of intersection of magnetic force and spring force (the limit at which brake operation is still possible). The rated air gap is defined by the minimum air gap required to enable operation of the open brake at zero residual torque plus all production-related tolerances.