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Clutches & Brakes Spring applied brakes
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SPRING APPLIED DISC BRAKES FROM INTORQ

ELECTROMAGNETIC SAFETY BRAKES FOR INDUSTRIAL MACHINERY

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INTORQ spring applied electromagnetic brakes are normally engaged and are released by DC voltage applied to the coil.  Braking is by dry friction in a range 0.1 to 2400Nm.  They are used for dynamic stopping and holding duties in a wide range of industrial machinery, particularly in safety critical industrial applications such as brake motors, cranes, hoists, fork lifts, wind turbines and medical machinery.  INTORQ brakes have previously used Lenze and Simplatroll brand names. Most common models are the BFK457 and BFK458 brakes

Spring applied brakes (sometimes known as safety brakes) are used for the dynamic stopping and holding of loads.  When the supply power is off, the brake is on.  Brake release occurs when a dc current of 12 to 205V is applied to the coil creating a magnetic force that opens the brake. This type of brake is commonly found in the brake motors.  A manual release can be fitted.

Spring applied brakes give a high level of safety and B10 data is available to aid the assessment of the safety levels in industrial machinery.  Safety is achieved through the brake design, the multiple springs and the quality of materials and machining.  However ultimately no brake can give safe operations if incorrectly maintained.  For use in sensitive industrial applications such as passenger lifts, special brake designs with increased safety are available.


spring applied brakes modular spring applied brakes spring applied brakes, intorq bfk468

STANDARD SPRING APPLIED SAFETY BRAKES 0.12 TO 125NM

INTORQ type BFK457
Simple and economic pre-assembled multi-spring brakes in 9 sizes. These single disc friction brakes are easy to mount.  A hand released is optional.  BFK457 spring applied brakes are robust and reliable with multiple springs to give safe stopping and holding of machinery.  Whilst the machine is running they are held in a released state by magnetic flux from a DC voltage with options from 12 to 205V.

MODULAR SPRING APPLIED SAFETY BRAKES 2 TO 600NM

INTORQ type BFK458, BFK458-L (Long life)

The BFK458 is a modular range of single disc friction brakes with electromagnetic release.  There is a wide range of options including adjustable brake torque, manual release, microswitches and high environmental protection.


The BFK 458 brake is known worldwide with millions in service in many safety critical applications such as cranes, lifts and hoists.  Other industrial uses include brake motors, wind turbines and powered carriages.  The single brake disc has friction materials on both sides and operates under dry conditions.

MULTI-POLE HIGH TORQUE SPRING APPLIED BRAKES 100-2400NM

INTORQ type BFK468
The BFK468 brakes use multiple coils to achieve a higher density of magnetic flux which generates higher torques in a given size.  Switching times are fast due to low inductance.

spring applied brakes intorq type bfk470

ROBUST IP66 SPRING APPLIED BRAKES 2 TO 370 NM

INTORQ type BFK470
Developed for wind turbines and dockside applications, the BFK 470 offers protection up to IP66. CCV versions suit -40oC.  A wide range of options includes different types of friction material.

MULTI-POLE SPRING APPLIED CALIPER BRAKES UP TO 10000NM

INTORQ Type BKF466.

INTORQ caliper brakes are designed to brake rotating discs.
Multi-pole and multi-spring technology generates high torques with a high level of safety.

HIGH TORQUE SPRING APPLIED BRAKES WITH HIGH ENCLOSURE 750 TO 1500NM

INTORQ type BFK471
Developed for port and marine applications, the BFK471 is enclosed to IP66 including the manual release.  750Nm is achieved with one brake disc, 1500Nm with two.

spring applied calliper brakes High torque spring applied brakes

SPRING APPLIED BRAKES FOR SERVO MOTORS INTORQ

INTORQ type BFK417
Designed specifically for volume applications on servo motors, the BFK417 has high torques, small dimensions and low backlash.  Torques 2 to 100Nm

INTORQ is a company formed by a management buy-out from Lenze in 2003. They have  a world leading expertise in electromagnetic clutches and brakes used in industrial machinery and manufacture 800,000 units per year.

INTORQ spares and service are available in the UK through Techdrives and our regional distributors.  Brakes used dynamically will wear and often the friction disc (rotor) will need to be replaced.  If other parts are damaged it is often best to replace the complete brake.  Refer to the downloadable manuals on our product pages.


Part of the Lenze selection range supported internationally by the Lenze Group