Programmable flexible DC power supply

The SM3300 Series consists of power supplies with excellent efficiency, stability and flexibility. Thanks to the auto-ranging power output, one power supply can cover two ranges of traditional power supplies with an rectangular VI-curve. For even more flexibility, the SM3300 series can be used at both single-phase as three-phase grid power.

Standard, the SM3300 series can be controlled via the front, web interface or Ethernet. This connectivity can be expanded at any time by our interface cards. Furthermore, the Master/slave interface allows parallel operation of up to 8 units.


cTUVus Certified

The SM3300 series is certified according to the UL 60950-1:2007 R12.11 standard. This certification by the reputable TÜV Rheinland is a confirmation of the high safety and quality standard of Delta Elektronika. This certificate combined with Delta Elektronika's reputation of long term product availability and product support turns the SM3300 series into excellent power supplies for larger systems.


Auto-ranging output

Auto-ranging output in the SM3300 series allows the power supply to switch between two output regions dynamically. This feature boosts the power supply's versatility, essentially performing the function of two traditional units. See the table below listing all variants in the SM3300 series to view all possible output regions. The L-curve VI-diagram demonstrates the auto-ranging behaviour.


High speed programming and Power sink

The SM3300 series offers optional 10-20x higher programming speed and lower output capacitance, perfect for laser applications, fast test systems, or as a low parallel capacitance current source in plasma chambers. The Power Sink Option absorbs bursts of power, maintaining constant output voltage. It's ideal for PWM-speed control in electric motors and automotive waveform generation. See both options here.


Excellence and high value

The SM3300 series showcases outstanding load response behaviour, upholding Delta's legacy of minimal electromagnetic interference, reduced audible noise, and high reliability and efficiency. Equipped with flexible output, a standard web interface, and plug-and-play interfaces, it proves indispensable across a multitude of applications. See the data-sheet for more information.

Unit Voltage Current VI-curve
0 - 18 V
0 - 220 A
0 - 33 V
0 - 66 V
0 - 110 A
0 - 55 A
0 - 50 V
0 - 100 V
0 - 75 A
0 - 37.5 A
0 - 165 V
0 - 330 V
0 - 22 A
0 - 11 A
0 - 330 V
0 - 660 V
0 - 11 A
0 - 5.5 A


  • Designed for long life at full power
  • Excellent dynamic response to load changes
  • Protected against all overload and short circuit conditions
  • EMC surpasses CE requirements: low emission and high immunity
  • Low audible noise: fan is temperature controlled
  • Automatic coarse and fine adjusting buttons


  • Operation on single and three-phase input voltages
  • Standard Ethernet Interface including sequencer
  • Large user display, menu-driven operation
  • Durable digital encoders for voltage and current adjustment
  • Plug & Play optional interfaces


  • Input voltage (single and 3 phase): 180-528 VAC (single or 3 phase 48-62 Hz), derating at low input voltage
  • Active Power Factor Correction (PFC): up to 0.99 (at 100% load)
  • Efficiency: up to 92% (at full load)
  • Output ripple and spikes: from 3 mVRMS / 12 mVPP
  • Regulation: from 2.5 mV
  • Recovery time: from 100 µs (50-100% load step)
  • Programming speed: from 1.6 ms (10-90%), optional from 0.2 ms
  • Output voltage and current stability: 6.10-5 / 9.10-5
  • MTBF: 500 000 hrs
  • Operating ambient temperature: -20 to +50 ºC


  • Emission: EN 61326-1 (class B equipment, for use in domestic establishment)
  • Immunity: EN 61326-1 (equipment for use in industrial and domestic establishment)
  • Safety: EN 60950-1 / EN 61010-1 / cTÜVus
  • Insulation input / output: 3750 VRMS (1 min.)
  • Protection class: IP20

Dimensions and weight

  • Width:19 inch
  • Height: 2 U
  • Depth: 455 mm
  • Weight: 15 kg
Dimensions SM3300


Optional factory installed features

High Speed Programming
High Speed Programming

A 10 to 20 times higher programming speed and lower output capacitance. Excellent for laser applications, fast test systems or as current source with low parallel capacitance as used in plasma chambers. For more information, download the data sheet High Speed Programming.

2-Quadrant Output: Power Sink
2-Quadrant Output: Power Sink

The 2-quadrant operation maintains the output voltage constant regardless the output power is positive or negative. Ideal for PWM-speed controlled DC-motors and ATE-systems. For more information, download the data sheet Power sink.


Add-on interfaces to be added at any time

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Application notes Type/Format Size
Application note Safe operation pdf 364.71 KB
Application note Battery charging pdf 54.34 KB
Software Type/Format Size
DE Applications bundle description pdf 104.29 KB
DE Applications zip 417.72 MB
Example Code and Software zip 168.81 KB
Firmware Type/Format Size
Release notes firmware update SM3300 series pdf 61.06 KB
Firmware update SM3300 series zip 7.31 MB
3D drawings Type/Format Size
3D drawings SM3300 series zip 2.58 MB
Compliance Type/Format Size
ROHS pdf 192.81 KB
REACH pdf 195.25 KB