When the input voltage fluctuates (e.g., mains voltage ±10%～±20%), the output voltage is maintained within ±0.5%～±1% of the set value (up to ±0.1% for high-precision models). It also suppresses interference such as noise, surges and harmonics from the input source.

When the input frequency varies (e.g., frequency drift during generator operation) or there is no input frequency (e.g., DC-input inverter applications), the output frequency is locked at 50 Hz / 60 Hz or a customized frequency, with a typical accuracy of ±0.01 Hz～±0.1 Hz.

It converts distorted input waveform (e.g., square waves, distorted sine waves) into pure sine wave output (THD ≤ 1%～5%), meeting the waveform quality requirements of precision equipment.

• DMFVR11: Single-phase input, single-phase output
• DMFVR13: Single-phase input, three-phase output
• DMFVR31: Three-phase input, single-phase output
• DMFVR33: Three-phase input, three-phase output

• Power Capacity: Select a rating of 1.5–2 times the rated power of the load to ensure sufficient overload margin.
• Accuracy Level: Choose voltage/frequency accuracy according to load requirements (e.g., ±0.1% for laboratory equipment, ±1% for industrial equipment).
• Input Conditions: Confirm input type and voltage range (e.g., wide voltage input AC 85–265 V).