DBM20 DIN Rail Mount Buffer Module

TDK-Lambda’s DBM20 24 V 20 A rated DIN rail buffer modules have a narrow 49 mm width to save space on the DIN rail, allowing additional modules and functionality to be fitted. A remote on/off inhibit function avoids the unsafe discharge of stored energy during system maintenance and servicing. The DBM20 provides an extended 250 ms hold-up time to power supplies preventing data loss during brief power interruptions or allowing equipment to safely shut down. Applications include industrial automation, robotics, and semiconductor fabrication equipment.

To remove the need for servicing and maintenance of batteries, energy is stored in electrolytic capacitors. Charge and discharge status can be monitored locally or remotely via a DC OK relay, LED indicators, and photocoupled signals. To obtain longer buffer times, the DBM20 modules can be connected in parallel. A front panel switch 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 49 mm x 123.6 mm x 115.4 mm (W x H x D), the units will operate without derating in ambient temperatures of -25°C to +70°C. The five-year warranty DBM20 has protection against both input overvoltage and overcurrent conditions, inrush current reduction, and internal fusing. Safety certification includes IEC/UL/CSA/EN 62368-1, UL 508 with CE marking to the low-voltage, EMC and RoHS directives.