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Power supply 3-phase, 24 V dc Dimension Q Series

  • Output current of 20 A
  • 95% efficiency
  • 65 mm wide
  • 50% bonus power
  • Maximum performance

Product description

Puls Dimension Q is a new generation of power supply unit with very small construction dimensions and many technical benefits. The unit has low inrush current (even with warm starts), active PFC, which provides a power factor close to one, expanded temperature range and active protection against line transients. Furthermore, there is a relay output (DC OK) that is deactivated when the output voltage deviates more than 10% from the set value. The bonus power provides an extra 50% boost with retained 24 V, which is an advantage when connected loads have high starting currents. The unit also has a high short-circuit current that simplifies tripping of secondary fuses. Both the bonus power and short-circuit current are time-limited to 4 seconds to avoid constant overloading of the unit and wiring. High efficiency provides long lifetime and low temperatures. The power supply unit can be connected for 2-phase operation with Inom up to 40°C. For higher temperatures, the load current must be reduced.


We recommend free space of 60 mm above/under the unit and 15 mm at the sides.



Bonus power

The power supply unit has bonus power that enables high power extraction with retained 24 V dc for 4 seconds, which is a major advantage when connected loads have high starting currents, such as the case with motors. How often bonus power can be utilised depends on the application. With the following diagram and formula, the repeat time can be calculated for each application. The bonus power is available as soon as the power supply unit is started and directly after a short circuit.


Bonus power

Operating characteristics

Bonus effect diagram power supply QT20.241

Duty cycle diagram power supply QT20.241




Nominal load current


Peak current


Time between bonus power


Peak current I time

Operating cycle

Tpeak / (Tpeak + To)


Tpeak - (operating cycle * Tpeak) / operating cycle

Example: Nominal load current (Po) is 15 A. Peak current (Ppeak) is 24 A = 120%. The peak time is 3 seconds. 15 A = 75% of Inom. According to the diagram, the operating cycle is 50%. To = 3 - (0.5 * 3) / 0.5 = 3 Maximum repeat time of bonus power is 3 seconds.


Number of variants matching filter 2/2 |

Part numbers

Parts Price Approvals Conformal coated
ABS, CB, CE, CSA US, cRUus, cULus, EAC, EN 50155, GL Yes


PSU 3PH 380-480V ac I/P 24V dc 20A 480W O/P

Technical data

Input data

Input voltage ac 380-480 V
Input voltage ac min 323 V AC
Input voltage ac max 552 V AC
Inrush current at 400 V ac typical 3 A
Input voltage range Wide-range
Power factor at 400 V ac, full load. Typical 0,94
Number of phases 3

Output data

Output voltage 24 V DC
Output voltage min 24 V DC
Output voltage max 28 V DC
Output current 20 A
Power 480 W

Efficiency / Lifetime / MTBF

Efficiency at 400 V ac, typical 94,2 %
Efficiency at 400 V ac, full load, typical 95 %
Lifetime at 400 V ac, full load and +40 ° C 105000 h
MTBF (IEC 61709) 400 V ac, max loan, +40 °C 690000 h


Width 65 mm
Height 124 mm
Depth 127 mm
Weight 0,87 kg


Approvals ABS, CB, CE, CSA, CSA US, cRUus, cULus, EAC, GL
Hold time at 400 V ac, typical full load 22 ms
IP class IP20
Clamp type Spring-clamp
Material protection Aluminium
Supply frequency 50-60 ±6 %
Ripple max 100 mV pp
Series Dimension Q
Power consumption at 400 V ac 0,79 A
Power drop from +60 °C to + 70 °C 12 W/°C
Temperature min without derating -25 °C
Temperature max without derating 60 °C
Type Power Supply AC-DC
DC relay output Yes
Active Transient Yes
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