Transformers & Regulators
Isolation transformers, voltage transformers, and voltage regulators from LISUN for test bench power conditioning. These three instrument types solve related but distinct problems and aren't interchangeable: isolation transformers break the direct earth reference for safe floating-ground measurement work, voltage transformers step high voltages down to safe, measurable levels for metering and protection applications, and voltage regulators actively hold output voltage steady against fluctuating mains input.
Isolation Transformer
ITEU-SP4K / ITEU-TP Series
Full galvanic isolation between mains supply and device under test, breaking the direct ground reference path for EMC test benches and safety isolation when servicing energised equipment.
Key specs: 4kVA single-phase, 220–240V input = output (1:1 isolation) · Output current = power × 80% ÷ output voltage · Low leakage capacitance winding · TP models: three-phase, 380V, 10–20kVA
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Voltage Transformer
ETUS-SP10K
Steps mains voltage up or down to match the rated voltage of test equipment, a common need when testing equipment built for a different regional mains supply than what's on the bench.
Key specs: 10kVA · Converts 110/120V (1ph) or 220/240V (3ph) input to 220V (1ph) or 380V (3ph) output · Efficiency ~55–60% · Often paired with ITEU-SP4K isolation transformer for clean, stable EUT power
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Voltage Regulator
RTEU-SP5K / RTEU-TP Series
Compensates for mains voltage fluctuation, holding a stable output voltage for sensitive test and calibration equipment even when the incoming supply sags or varies.
Key specs: 5kVA single-phase, input 198–264V → stabilized 220V output · Contact-type autocoupling regulator with servo motor control · Range: 1–15kVA single-phase, 6–15kVA three-phase (TP models)
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