Isolation transformer line conditioners

The subject of this page involves isolation transformer based line conditioning with re-established neutral-ground bonding on the output of the transformer.For purifying power as well as protecting your systems

TSi Power manufactures a variety of low-impedance isolation transformer power conditioner series for solving many different kinds of power problems as well as providing surge protection. Please look at the detailed descriptions below, or at the Series features table, to help determine the line conditioner series you need. We also welcome your phone call to discuss your specific application requirements. Some of the units below also add precision voltage regulation to the picture, a very desirable attribute for most developing country applications.

Isolation line conditioner series

power conditioner with isolation transformer provides noise free line conditioning with a neutral-ground bond on the output of the 120v transformer.ILc ~ This low-impedance isolation transformer series is recommended for severe environments where absolute reliability is a must. ILc units can replace a dedicated line while improving system performance. The ILc Series offers full isolation with a neutral-to-ground bond, excellent surge protection, the best noise filtering, tolerance of frequency variations and unpredictable loads, high efficiency, quiet operation and excellent reliability. ILc Series units come with a limited five-year warranty.

Applications include: digital copiers, medical equipment, point-of-sale terminals, telephone systems, industrial control equipment and other types of equipment with high availability and reliability requirements.

Three phase 120/208Y power conditioner with low-impedance isolation transformer line conditioning provides noise free power conditioning with a neutral-ground bond on the output of the transformer.Standard ILc Series single and two phase models include:
ILc-600B and 1000B ~ 120 vac, 600 and 1000VA,  
ILc-1800 and 2000 ~ 120 vac, 1800 and 2000VA  
ILc-2400-3600 ~ 120 vac, 2.4 and 3.6 kVA  
ILc-2400-3600 ~ 208/220/230/240 vac, 2.4 and 3.6 kVA  
ILc-4400-5500 ~ 208/220/230/240 vac, 4.4 and 5.5 kVA  
ILc-15000 ~ 208 vac, 15 kVA
Other sizes are available up to 90 kVA for OEM, bespoke/custom applications.

Standard ILc Series three phase models include:
ILc-9000/16500-0338 ~ 9 kVA/16.5 kVA, 400 vac three phase delta input, 230/400 vac three phase wye output.
ILc-24000-36000-120/208Y ~ 24 kVA/36 kVA, 120/208 vac three phase wye input/output.
Other sizes are available up to 270 kVA for OEM, bespoke/custom applications.


Medical isolation transformer line conditioner provides the ultimate in low-leakage current power conditioning for hospitals and diagnostic equipment.ILc-Med ~ Hospital-grade line conditioner with four medical grade duplex outlets (eight total receptacles) ~ As above ILc isolation transformer Series, but further enhanced and UL Listed to UL/cUL 2601 meeting the medical isolation transformer low leakage current specifications for hospital and patient vicinity equipment applications. ILc-Med units have an extremely low input ac leakage current (typical 50μA) rating which exceeds both domestic US (UL 60601-1), and international (IEC 601) medical standards for a leakage current limit of 300μA maximum for non-patient connected medical equipment and instruments.

ILc-1000-1400Med4 ~ 120V, 1000 and 1400VA
Other sizes are available for OEM, bespoke/custom applications.


Power conditioner with precision automatic voltage regulation and with dual input/output low-impedance isolation transformer line conditioning provides the ultimate in heavy-duty single phase power protection.Dual range ILc-VRp ~ The ILc-VRp dual range automatic precision voltage regulator with built-in low-impedance isolation transformer allows trouble-free operation of electronic equipment over a very wide ac voltage range of 120 or 240 vac + / - 20 % found in many developing countries. Dual voltage input enables use with either 120 vac or 240 vac power, dual voltage output enables 115 vac via two NEMA 5-15R receptacles, and / or 230 vac via one BS 1362 socket. Output regulation responds in less than one line cycle and corrects output voltage to + / - 2.5 % with 20,000 corrections per second. There is no switching of taps or otherwise a break in the power path as continuous PWM (pulse-width-modulation) switching of the primary winding of a buck-boost transformer leaves the secondary power path intact.   

ILc-2000-VRp-Dual-Range ~ Input: 120 or 240 vac. Output: 115 and/or 230 vac single phase. 2 kVA.


Precision constant voltage output ferroresonant isolation transformer line conditioner provides the ultimate in heavy-duty surge protection and power conditioning.FLc ~ The FLc Series ferroresonant constant voltage regulation transformer based conditioner is recommended for extreme environments where absolute reliability is a must. The FLc voltage stabilizer units can replace a dedicated line and reduce harmonics, while improving system performance. Applications include industrial control equipment and telephone systems, generator/UPS combinations and other types of equipment with high availability and reliability requirements. The FLc Series of voltage stabilizers offers guaranteed constant output voltage via a ferroresonant transformer, full isolation with a neutral-to-ground bond, the best surge protection available, excellent noise filtering, as well as excellent reliability.   

FLc-750-1000-1500 ~ 120 vac ~ 750, 1000 and 1500 VA (230 vac models are available).


Picture of Outdoor VRx Series precision voltage regulator with isolation transformer option.Outdoor VRx ~ The Outdoor VRx Series precision automatic voltage regulator, with optional built-in low-impedance isolation transformer, allows trouble-free operation of electronic equipment over a very wide mains ac voltage range of 172 to 276V found in many developing countries. Output is 230 vac +/-3% under a normal input range of 172 to 276V. There is no switching of taps nor any break in the power path thanks to continuous pulse width modulation (PWM) switching of a buck-boost transformer primary winding. Units feature an over-voltage cutoff, with automatic restart when ac mains voltage returns to normal (safe) condition. Also, there is a failsafe/automatic bypass (even during bypass, the over-voltage protection is active).

Designed for applications where absolutely safe and precisely regulated ac power is required, such as radio base stations (RBS), telecommunication transmission sites for backhaul (including microwave links), TV/ radio broadcasting, industrial equipment and end-of-line utility equipment.

OutdoorVRx-4400-0455/0460 ~ 230 vac single phase, 4.4 kVA. Other sizes are available up to 15 kVA single phase, and up to 30 kVA dual/three phase.


Picture of Outdoor VRp-ILc precision voltage regulator with isolation transformer output.Outdoor VRp-ILc ~ The Outdoor VRp-ILc Series precision automatic voltage regulator with built-in low-impedance isolation transformer allows trouble-free operation of electronic equipment over a very wide mains ac voltage range of 400V+/-20% found in many developing countries. Output is within 230/400 vac +/-3% under a normal input range of 400 vac +/-20%. There is no switching of taps nor any break in the power path thanks to continuous pulse width modulation (PWM) switching of a buck-boost transformer primary winding. Units feature an over-voltage cutoff, with automatic restart when ac mains voltage returns to normal (safe) condition. Also, there is a failsafe/automatic bypass (even during bypass, the over-voltage protection is active).

Designed for applications where absolutely safe and precisely regulated ac power is required, such as radio base stations (RBS), telecommunication transmission sites for backhaul (including microwave links), TV/ radio broadcasting, industrial equipment and end-of-line utility equipment.

Outdoor VRp-ILc-15000/30000-5339 ~ 15 or 30 kVA, 400 vac three phase delta input, 230/400 vac three phase wye output. Other sizes are available, please call.


ILc, ILc-Med, ILc-VRp, VRx and FLc Series features table

Features Series
  ILc ILc-Med ILc-VRp FLc
Input/output isolation transformer        
Medical grade UL/cUL 2601 design        
Filtering and surge protection        
Over/under-voltage cutoff (most models)        
Wide voltage input window        
Ferroresonant CVT regulation +/-3%        
PWM precision voltage regulation +/- 3%        
Automatic bypass        
Outdoor option (and Outdoor VRx models)        

TSi Power also manufactures custom/bespoke isolation transformer line conditioners. Please call for more information.

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ILc logo for the TSi Power Corporation product line of isolation transformer based low-impedance line conditioners.ILc-Med logo for Medical grade isolation transformer low leakage current line conditioners.Logo for Dual range ILc-VRp Series units. Precision voltage regulation with isolation transformer and neutral-ground bonded output.Logo for FLc Series, ferroresonant constant voltage output transformersLogo for Outdoor VRx Series precision voltage regulator with isolation transformer output.Logo for Outdoor VRp-ILc Series units. Precision voltage regulation with isolation.


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