New Industry Products

Low Loss 20A to 40A DIN Rail Mount Redundancy Module Assists Load Current Balancing

April 16, 2019 by TDK-Lambda Corporation

This article features TDK Corporation DRM40 series low loss 20A to 40A DIN rail mount redundancy modules assists load current balancing.

TDK Corporation announces the introduction of the DRM40 series DIN rail mount redundancy modules.  The two 20A 10V to 30Vdc rated inputs can be connected to provide a 20A redundant configuration, or using the load balancing option, to deliver a 40A output.  For capacitive and inductive loads, the DRM40 will support an additional 50% peak load for four seconds.  The use of low-loss MOSFET reverse current protection devices reduces the internal voltage drop to just 200mV.  Applications include industrial process control, factory automation, battery chargers, and test and measurement equipment.

If the input currents are unbalanced, the DRM40 front panel mounted LED is off. When the input voltages are adjusted and the load current is shared equally, the LED is illuminated.  In addition, the DRM40 has two isolated DC Good PhotoMOS relays to indicate that each input voltage is between the limits of 10V and 30V.  Two front panel mount DC Good LEDs provide visual indication.  For cost sensitive applications the DRM40B has identical electrical performance without the current balance and DC Good functions.

The DRM40 series is housed in a compact rugged metal enclosure, with overall dimensions of 35mm x 124mm x 125mm (W x H x D) and is suitable for mounting on TS-35/7.5 and TS-35/15 DIN rails. The operating ambient temperature is -40oC to +70oC with no derating. Both models are safety certified to IEC/EN/UL/CSA 60950-1, IEC/EN/UL/CSA 62368-1, UL 508 and are CE marked for the Low Voltage, EMC and RoHS Directives.

More information can be obtained at the following TDK-Lambda Americas webpage. Product availability for the DRM40 DIN rail modules can be found via the link to TDK-Lambda’s distributor network link here.


Major Applications

Industrial process control, factory automation, battery chargers, and test and measurement equipment.


Main Features and Benefits

  • Low 200mV Voltage Drop
  • Current Balance Indicator Option
  • Isolated Alarm Signaling Option
  • 50% Peak Current Rating


Major Specifications

Model   DRM40 DRM40B
Input voltage range Vdc 10 to 30Vdc 10 to 30Vdc
Input current (Maximum) A Two x 20A (30A peak) Two x 20A (30A peak)
Output current (Maximum) W One x 40A (60A peak) One x 40A (60A peak)
Internal voltage drop mV Less than 200mV at 40A Less than 200mV at 40A
Current balancing - Yes


Alarm signaling - Yes No
Safety Certification - IEC/EN/UL60960-1, IEC/EN/UL62368, UL508 IEC/EN/UL60960-1, IEC/EN/UL62368, UL508
Size (WxHxD) mm 35x124x125mm 35x124x125mm


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.