ValuTRAN®

ValuTRAN® is designed to deliver industrial control power electrical performance in a small footprint.  This cost-effective product line will satisfy custom application requirements with the same quality and service levels found in the Micron ImperviTRAN® and ImperviTRAN I-2® encapsulated designs, and will be shipped within Micron’s consistently industry shortest lead time of 10 working days or less ARO.  With its varnished coil construction, ValuTRAN® offers another option, especially if your application does not require or significantly benefit from an encapsulated coil design.

Offering the same wide range of line and load voltage combinations offered with the other Micron CPT products, ValuTRAN® will be a problem solver for tight mounting constraints as well as component cost pressures.  Please contact Micron for further information regarding this product at 800-664-4660.

Low Voltage General Purpose Transformers

Single PhaseType 1-E EncapsulatedType 1-E general purpose transformers are single phase, resin encapsulated designs suitable for indoor or outdoor applications. It’s totally enclosed, non-ventilated enclosure make it ideally suited for use in areas that contain dust, moisture, or corrosive fumes. Available in ratings through 25 KVA type 1-E transformers can be mounted in any position for indoor installations and in upright positions only for outdoor installations.	Three PhaseType 3-E EncapsulatedType 3-E resin encapsulated, 3-phase transformers are available in ratings of 3-75 KVA. Its totally enclosed non-ventilated enclosure makes the 3-E ideally suited for outdoor as well as indoor locations. Type 3-E transformers utilize the 185°C insulation system with 115°C rise. 3-E transformers 3-15 KVA are T-T connected.Units installed outdoors must be mounted in upright position.	Single Phase Type 1-V Ventilated 1-V general purpose transformers are single phase ventilated units designed primarily for indoor locations (also for outdoor for 600 volt class with the addition of weathershields). The 1-V utilizes a 220°C insulation system with 150°C rise and is available in ratings of 15-167 KVA.	Three Phase Type 3-V Ventilated The 3-phase 3-V ventilated dry-type is available in ratings of 15-750 KVA. Its 220°C insulation system (150°C rise) is self-extinguishing. 3-V enclosures are designed for indoor locations (or outdoors for 600 volt class with addition of weathershields).

General Information

Industry Standards

All Micron dry-type distribution and control transformers are built and tested in accordance with applicable NEMA, ANSI and IEEE standards. All 600 volt class transformers are UL listed unless otherwise noted.

Seismic Qualified

The Micron family of dry-type distribution transformers is seismically tested, seismically qualified, and exceeds requirements of the Uniform Building Code (UBC) and California Code Title 24.

Frequency

The design life of transformers having different insulation systems is the same -the lower temperature systems are designed for the same life as the higher temperature systems.

Sound Levels

All Micron 600 volt class dry-type distribution transformers are designed to meet NEMA ST-20 levels listed here.

*Applies to general purpose transformers only.

Winding Terminations

Primary and secondary windings are terminated in the wiring compartment. Encapsulated units have copper leads or stabs brought out for connections. Micron recommends external cables be rated 90°C (sized at 75°C ampacity) for encapsulated designs.

Series-Multiple Windings

Series-multiple windings consist of 2 similar coils in each winding which can be connected in series or parallel (multiple). Transformers with series-multiple windings are designated with an “X” or” I” between the voltage ratings. such as primary voltage of “120/240” or “240 X 480”. If the series-multiple winding is designated by an “X” the winding can be connected only for a series or parallel. With the”I” designation, a mid-point also becomes available in addition to the series or parallel connection. As an example, a 120 X 240 winding can be connected for either 120 (parallel) or 240 (series), but a 120/240 winding can be connected for 120 (parallel), or 240 (series), or 240 with a 120 mid-point.

View Low Voltage General Purpose FAQs.

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Buck-Boost Transformers

A Buck-Boost Transformer is used to provide an economical method of correcting a lower or higher voltage to a voltage rating more suitable for efficient operation of electrical equipment.

Buck-Boost Transformers are small KVA, single phase, 600 volt class insulating transformers with dual primary and dual secondary windings and are usually connected as autotransformers by utilizing one unit for single phase applications and either two or three units banked for three phase operation. They are primarily used for motor operation and should not be used for motor control circuits, to correct fluctuating line voltage or to obtain a neutral on a delta system. These applications require transformers especially designed for these specific applications.

Note: When installation is to be made on a grounded system, consideration must be given to the resulting voltage. Thus, on a 208 grounded wye/120 system the voltage can be boosted to 240 volts but the voltage to ground will be 139 volts. If 240/120 volts with a mid-point ground is needed, a standard two-winding transformer must be used.

The following formulas can be used to calculate specific requirements.

For Single Phase:

LOAD KVA =
Load Voltage x Full Load Amps
1000

For Three Phase:

LOAD KVA =
Line Load Voltage x 1.73 x
Full Load Amps
1000

The following information is necessary for selecting a buck-boost transformer.

Line Voltage – The voltage that you want to buck (decrease) or boost (increase). This can be found by measuring the supply line voltage with a voltmeter.Load Voltage -The voltage at which your equipment is designed to operate. This is listed on the nameplate of the load equipment.

Load Amps or Load KVA – You do not need to know both-one or the other is sufficient for selection purposes. This information usually can be found on the nameplate of the equipment that you want to operate.

Frequency – The supply line frequency must be the same as the frequency of the equipment to be operated-Micron Buck-Boost Transformers operate at 60 Hz only.

Phase – The supply line should be the same as the equipment to be operated-either single or three phase.

Transformer Interconnection

For three phase applications, interconnections of transformers should be made in a junction box. Two or three transformers may be used depending on an open delta (2) or wye (3) connection.

Note: For 1 phase connections and 3 phase open delta connections, inputs and outputs may be reversed. KVA capacity remains constant.

To order, call 1-800-664-4660.

View Buck-Boost FAQs.

Control Transformer Accessories

Low Voltage General Purpose Transformer Accessories