Dunkermotoren E38R Power-Off Brake

The Dunkermotoren E38R is a spring-force power-off brake that holds a motor axis the instant supply voltage is removed, so vertical loads, positioning stages and gravity-loaded axes stay put through an emergency stop or power failure. Because the holding force comes from a spring rather than a permanent magnet, torque stays predictable as the motor heats up or the duty cycle changes, and there's no polarity to get wrong on connection. The E38 brake integrates directly into Dunkermotoren's BG45XI motor housing (BG45x15 and BG45x30 variants) at IP65, with engagement controlled by the motor's own software rather than a separate switching circuit. Where a standalone mount is preferred, it can also be fitted openly or under a cover, connecting via 300mm grey leads (UL style 1569 AWG 24) to a 24Vdc supply. Its combination of fast engagement and compact Ø38mm body suits small servo and stepper axes where a vertical load, clamp or positioning stage must not drift the moment power is lost, typical in general motion control, factory automation and small robotic axes. It's part of Dunkermotoren's full power-off brake series, which spans the permanent-magnet E22R and E100R through to the higher-torque spring-force E90R, E310R and E600R for larger axes, plus the power-on E46A to E605A range for applications requiring a normally-braked default state. All rated values apply in the run-in condition.