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Buffer module, 24 V dc

  • Overcomes temporary power failures
  • Manages 20 A/24 V DC for 200 ms
  • Status outputs
  • Maintenance-free

Product description

The buffer module is connected in parallel with the power supply unit's 24 V dc output and is changed with a capacitor bank. If the primary voltage of the power supply unit falls to zero and the output voltage falls to 22.5 V dc, the buffer module is automatically switched in and overcomes the power failure. The buffer module can supply 20 A/24 V dc for 200 ms; if the load current is lower, the time increases. When connecting two modules in parallel, the time is doubled up to 20 A, alternatively, up to 40 A power supply can be connected for 200 ms. There are two status inputs that indicate when the buffer module is ready to discharge and when it is active. Additionally, there is an input for disconnection of the module for safety circuits and service, for example. A LED on the front shows the status. The buffer module requires no maintenance in that it lacks a battery and fits all applications for which one wants to avoid stops due to temporary power failures. Available for both the Dimension and Silverline series.

V -1 V must be used if working with voltages higher than 24 V dc, such as for compensation of voltage drops in cables. The module will then be activated when the voltage falls -1 V beneath the set voltage, faster than 0.54 V/s. (If the fall time is slower than 0.54 V/s, the buffer module is connected when the voltage reaches 22.5 V dc.)


Drawing to bufferttime

Discharge curve




Parts Price



Buffer Module 24V dc I/P 24V dc 20A O/P

Technical data

Input data

Input voltage from the unit 24 V DC
Input current during charging 0,6 A

Output data

Output current in buffer mode max 20 A
Output current at 24 V dc 20 A
Output voltage normal operation 24 V DC
Output voltage at buffering 22,5 V DC
Output current during operation max 20 A

Efficiency / Lifetime / MTBF

Efficiency 99 %
Life span 166 000 h @ 40 °C, stand-by mode
MTBF (IEC 61709) 2 327 000 h @ 40 °C, stand-by mode


Width 64 mm
Height 124 mm
Depth 102 mm
Weight 0,74 kg


Approvals CB, CE, CSA, CSA US, EAC, UL
IP class IP20
Charging the battery type 0,6 A
Material protection Aluminium
Ripple max 200 mV pp
Voltage level for activating the buffer module 22,5 V DC
Temperature min without derating -25 °C
Temperature max without derating 70 °C
Type Power Supply Buffer Module


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