New Industry Products

TDK Buffer Modules Offer an Extra 380ms Hold-up in an Open Frame Package

April 01, 2021 by Hailey Stewart

This article highlights TDK Lambda ZBM20 12V, 15V and 24V 20A rated open-frame buffer modules for industrial automation, robotics, test, communication and semiconductor fabrication equipment.

TDK Corporation announces the introduction of the TDK-Lambda brand ZBM20 12V, 15V and 24V 20A rated open-frame buffer modules. The ZBM20 series provides an extended 380ms hold-up time to power supplies preventing data loss during brief power interruptions or allowing equipment to safely shutdown. Applications include industrial automation, robotics, test, communication and semiconductor fabrication equipment.

Energy is stored in electrolytic capacitors, replacing the need for batteries and their associated maintenance and servicing. A remote ON/OFF function can be activated to avoid an unsafe discharge of stored energy. The charge and discharge status can be monitored locally or remotely via a DC OK relay, an LED indicator and photo-coupled signals. If a longer hold-up time is desired, modules can be connected in parallel. The 24V model has a switch that can be used to select either fixed or variable voltage buffer levels. In fixed mode, it will provide power when the input voltage drops to 22.4V, in variable mode when the input decreases by 1V.

Measuring 175 x 85 x 57mm (L x W x H), the units will operate without derating in ambient temperatures of -25°C to +70°C. The five-year warranty ZBM20 has protection against both input overvoltage and overcurrent conditions, has inrush current reduction and internal fusing. Safety certification includes IEC/UL/CSA/EN 62368-1 with CE marking to the Low Voltage, EMC and RoHS Directives.

More information can be obtained at the following TDK-Lambda Americas website,, or by calling 800-LAMBDA-4. Product availability for the ZBM20 power supply can be found via the link to TDK-Lambda’s distributor network (see “Check Distributor Inventory”) at TDK lambda website.


Main Applications

  • Industrial automation, robotics, test, communication and semiconductor fabrication equipment


Main Features and Benefits

  • Provides 380ms additional hold-up time at up to 448W
  • Utilizes electrolytic capacitors to store energy
  • Five year warranty
  • Parallel capable
  • Output remote ON/OFF function


Model   ZBM20-12 ZBM20-15 ZBM20-24
Input voltage range Vdc 11.5 - 14.4 14.4 - 18 Fixed mode: 23 - 30,
VIN-1 mode: 24 - 30
Output voltage Vdc 11 13.8 22.4
Maximum current A 20
Average buffer  W 220 276 448
Signals and indicators - DC OK relay, photo-coupled signals and LED
Safety Certifications - IEC / UL / CSA / EN 62368-1 and CE mark
Size (L x W x H) mm 175 x 85 x 57
Warranty - Five years



About TDK Lambda

TDK-Lambda Corporation, a group company of TDK Corporation, is a leading global power supply company providing highly reliable power supplies for industrial equipment worldwide. TDK-Lambda Corporation meets the various needs of customers with our entire range of activities, from research and development through to manufacturing, sales, and service with bases in five key areas, covering Japan, Europe, America, China, and Asia.