ZBM20 Buffer Modules

TDK-Lambda's ZBM20 12 V, 15 V, and 24 V, 20 A rated open-frame buffer modules provide an extended 380 ms hold-up time to power supplies. This prevents data loss during brief power interruptions or allowing equipment to safely shutdown.

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 photocoupled signals. If a longer hold-up time is desired, modules can be connected in parallel. The 24 V 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 22.4 V, in variable mode when the input decreases by 1 V.

Measuring 175 mm x 85 mm x 57 mm (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 protects against both input overvoltage and overcurrent conditions, has inrush current reduction, and has internal fusing.

Safety certification includes IEC/UL/CSA/EN 62368-1 with CE marking to the low voltage, EMC, and RoHS directives.