Introducing the ZBM20 series of 12V, 15V and 24V 20A open frame buffer (hold-up) modules

Posted by David on May 11, 2021
Posted in: News, Products

The ZBM20 series of buffer modules provides 380ms additional hold-up or up to 448W peak power for loads connected to 12V, 15V and 24Vdc AC-DC power supplies. Multiple modules can be paralleled for longer buffer times. This extended hold-up time allows the equipment to shut down safely during AC power interruptions to avoid data loss. Typical applications for these open frame modules, which come with a five-year warranty, include semiconductor fabrication equipment, industrial machinery, robotic automation, and test and measurement equipment.

The ZBM20 series uses electrolytic capacitors to store the hold-up energy rather than batteries, removing the need for battery servicing and maintenance. The remote on/off function inhibits the output to avoid the unsafe discharge of stored energy.

All models in the ZBM20 series provide power when the input voltage drops below a preset level. Additionally, the 24V model can be switched to deliver power when the input decreases by 1V.

The five-year warranty ZBM20 has protection against both input overvoltage and overcurrent conditions. Inrush current reduction and internal fuses are also provided. Safety certification includes IEC/UL/CSA/EN 62368-1.

For more information about the TDK-Lambda ZBM20, please visit:

If you have a question you’d like to ask TDK-Lambda, please feel free to use the online FAQ form, and we’ll get back to you with an answer to your question as soon as possible.