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    Status displayGreen status LED (buffer charged/discharged, charging/discharging)
    Isolation voltages
    Input - Output1 kV (routine test)
    1 kV (type test)
    Active DC OK switch output24 V, 20 mA
    Connection typeScrew clamp connection
    Connection cross section
    Wire end sleevesFlexible cables require wire end sleeves in order to fulfill EN 60950 / UL 60950
    Flexible0.5 to 10 mm² / 20 to 6 AWG
    Inflexible0.5 to 16 mm² / 20 to 6 AWG
    Switch output
    Wire end sleevesFlexible cables require wire end sleeves in order to fulfill EN 60950 / UL 60950
    Flexible0.2 to 2.5 mm² / 24 to 12 AWG
    Inflexible0.2 to 2.5 mm² / 24 to 12 AWG
    Wire stripping length10 mm (input/output)
    ULcULus E123528
    Industrial control equipment
    Internal fuseYes
    Loading time<27 s
    Nominal voltage24 VDC
    Input voltage range22.5 to 30 VDC
    Current consumption
    Maximum20.6 A (max.)
    No-load operation0.1 A
    Loading procedure0.6 A
    Load delayNo
    Switching threshold<22 VDC (fixed)
    (UIN - 1 V) / 0.1 s (variable)
    Protective circuitTransient overvoltage protection - Suppressor diode, 35 VDC
    Reverse polarity protectionYes
    Buffer currentUp to 20 A
    Current limitation27 A (buffer mode)
    Buffer voltageUIN - 0.8 V and >22.0 V
    Buffer time0.2 s at 20 A and 4 s at 1 A
    Setting range for buffer voltage22 - 28.5 VDC
    Max. conduction current27 A (at 40°C)
    20 A (at 70°C)
    Cutoff>4.5 s (buffer operation)
    Nominal voltage24 VDC (depending on input voltage)
    Residual ripple<100 mVSS (buffer operation)
    Switching peaks<100 mVSS (20 MHz)
    Can be connected in parallelYes, to increase buffer time and for redundancy
    Can be connected in seriesNo
    Protection against internal overvoltagesYes, limited to approximately 35 VDC
    Power back immunity<35 VDC (buffer operation)
    Output noise suppressionUnit complies with EN 55011 (Class B)
    Efficiency>95% (at 27 A)
    MTBF>500,000 h, per IEC 61709 (SN 29500)
    Power dissipation
    Readiness at 27 AMax. 2.5 W
    Buffer operation at 27 AMax. 9.8 W
    Mounting orientation
    Ventilation/CoolingNormal convection, no fan required
    Degree of protection per EN 60529IP20
    Rated protectionIII, without PE connection
    Operation-25 to 70°C
    Storage-40 to 85°C
    Transport-40 to 85°C
    Relative humidity
    OperationMax. 95%, non-condensing
    Operation<15 Hz, amplitude ±2.5 mm, per IEC 60068-2-6
    15 to 150 Hz, 2.3 g, 90 min
    Operation30 g in each direction, per IEC 60068-2-27
    Pollution degree2, per EN 50178
    Climate category3K3, per EN 60721
    MaterialAluNox (AlMg1)
    InstallationEasy rail mounting (DIN rail NS 35, EN 60715)
    Width64 mm
    122 mm (mounted sideways)
    Height130 mm
    Depth125 mm
    67 mm (mounted sideways)
    Weight1000 g


  • Buffering for 24 VDC consumers
  • Output current to 20 A
  • Can be switched in parallel for larger buffer currents and times
  • Easy to switch in parallel to the power supply or to the load in the 24 VDC circuit
  • Simple and problem-free retrofitting of existing systems
  • Suitable for industry because of capacitor-based energy storage (no rechargeable battery)
  • High MTBF (>500,000 h)
  • International certification package
  • Wide temperature range from -25 to 70°C
Product description:
Material number:
24 VDC buffer module, 0 to 20 A, buffer time 0.2 s at 20 A to 4 s at 1 A, top-hat rail installation
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