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 mo...
Read MoreThe 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.
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Features
- Spring-force power-off design holds the load whenever the 24Vdc supply is removed — the axis stays put on power loss with no holding current
- Engages in just 5ms — the fastest in the spring-force power-off range — and clears in 20ms, catching the load the instant power drops and releasing promptly when it returns
- 0.2Nm nominal holding — the lightest spring-force build, sized for small axes a higher-torque brake would over-brake
- Insensitive to temperature and load changes, so holding stays predictable through duty cycling and thermal swings
- The most compact spring-force brake — Ø38mm, 23mm long and 0.12kg — for tight motor stacks where a larger brake won't fit
- IP20 as supplied, or up to IP65 with covers or inside a brushless motor's profile housing — one brake for open or sealed installs
- 300mm UL style 1569 AWG 24 flying leads for direct wiring, no adapters or extra tails
Specifications
| POWER-OFF BRAKE SPECIFICATIONS | ||
|---|---|---|
| Nominal voltage | Vdc | 24 |
| Nominal torque(1) | Nm | 0.2 |
| Torque range(1)(2) | Nm | – |
| Nominal current(1) | A | 0.20 |
| Nominal input power(1) | W | 5 |
| Activation time | ms | 5 |
| Deactivation time | ms | 20 |
| Protection class | IP | 20 |
| Weight | kg | 0.12 |
| Noise | – | – |
| Diameter (Ø) | mm | 38 |
| Length (L) | mm | 23 |
| Strand colour GND | – | grey |
| Strand colour Vdc | – | grey |
| Strand length | mm | 300 |
| Strand type / cross section | – | UL style 1569 AWG 24 |
| (1) Values valid in run-in condition | ||
| (2) Over the temperature | ||
Warranty & Returns
Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.
FAQs
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- Nominal Torque: 0.148 - 0.263 Nm
- Nominal Speed: 3680~4660rpm
- Voltage: 12~24Vdc
- Power: 86 ~ 159W
- Torque: 16.1 ~ 25Ncm
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- Nominal Current | 0.41 A
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- Nominal Torque | 4.5 Nm
- Nominal Current | 0.54 A
- Nominal Input Power | 13 W