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    40 kVA Isolation Transformer, 3 phase, 240 Volt to 480 Volt

    $5,893.65
    SKU: ATO-T-SG40KVA
    40 kVA isolation transformer is designed to step down 3 phase voltage 480V to 240V or step up 240V to 480V, aluminium/copper winding material, and widely used in various power supply sites with frequency 50Hz or 60Hz.

    45 kVA Isolation Transformer, 3 phase, 415V to 208V

    $6,321.43
    SKU: ATO-T-SG45KVA
    Highly effective 45 KVA 3 phase isolation transformer that is 50Hz / 60Hz rated and superior quality, transform the voltage 415V to 208V, also 208V to 415V transformer is available, IP 24 protection grade of enclosure for protection.

    50 kVA Isolation Transformer, Step up/Step down 480V with 400V

    $6,492.06
    SKU: ATO-T-SG50KVA
    Step up and step down isolation transformer to convert the voltage between 480V and 400V. Three phase unit with 50 kVA power rating, primary and secondary windings are separated by aluminium/ copper shield.

    60 kVA Isolation Transformer, 3 phase 190V to 3 phase 400V

    $7,635.25
    SKU: ATO-T-SG60KVA
    ATOSG-60KVA isolation transformers is 50/60 Hz rated, designed to step down 3 phase 400V AC to 3 phase 190V, step up 190V to 400V type is available, and come in a IP24 enclosure for indoor use.

    75 kVA Isolation Transformer, 3 phase, 480 Volt to 220 Volt

    $8,135.41
    SKU: ATO-T-SG75KVA
    Safety 75kVA isolation transformer come in a NEMA 3R enclosure, which is available in the circuit of AC 50Hz/60Hz and convert 3 phase voltage 480V to 220V and 220V to 480V version is optional , low noise, lower temperature rise, higher efficiency.

    80 kVA Isolation Transformer, 3 phase 480V to 3 phase 380V

    $9,336.51
    SKU: ATO-T-SG80KVA
    Three phase isolation transformer with 80 kVA capacity and a primary voltage of 480V AC on the primary side, and secondary voltage of 380V AC on the secondary side. The lower operating costs, lower heat emissions make this transformer ideal for a wide range of applications.

    100 kVA Isolation Transformer, Step up/Step down 208V with 400V

    $14,085.71
    SKU: ATO-T-SG100KVA
    100 kVA capacity isolation transformer with IP protection grade enclosure for indoor or outdoor use, dry air self cooling of cooling method. Step up or step down isolation transformer to convert the 3 phase voltage between 208V and 400V.

    150 kVA Isolation Transformer, 3 phase, 240 Volt to 400 Volt

    $19,098.65
    SKU: ATO-T-SG150KVA
    150 kVA isolation transformer with high quality and cheap price. 3 phase to 3 phase, (we can customize 3 phase voltage to single phase voltage), step up primary voltage 240V to secondary voltage 400V, step down 400V to 240V type is optional, low noise, lower temperature rise, higher safety.

    200 kVA Isolation Transformer, 3 phase, 480V to 240V

    $25,413.65
    SKU: ATO-T-SG200KVA
    3 phase isolation transformer has continuous ratings of 200kVA, step up 240V to 480V or step down 480V to 240V. Safety isolation transformer can also maintain equipment separation from a power source.

    300 kVA Isolation Transformer, 3 phase, 480V to 400V

    $30,086.16
    SKU: ATO-T-SG300KVA
    300 kVA isolation transformer is a 3 phase unit with a primary voltage of 480V and secondary voltage of 400V, it's a safe isolating transformer not only provides an increased level of protection against electric shock, but also used to step down voltage of equipment.

    Used 3 Phase 45kVA Isolation Transformer, Delta Configuration 240V to 240V

    $5,629.15
    SKU: ATO-3UIT-45
    Reasonable price used 3 phase 45 kVA isolation transformer for sale online. 240V to 240V isolation transformer with 4 wire three phase high-leg delta configuration and 50 Hz / 60 Hz frequency. Working temperature between -15 ℃ and 40 ℃. Enclosure protection grade of 3 phase isolation transformer is IP24.

    1kVA 110V to 120V/240V Split Phase Transformer

    $1,343.75
    SKU: ATO-DGS1kVA
    Split phase transformer capacity 1 kVA, convert primary voltage AC 110V to secondary voltage 120V/240VAC, support voltage customization, frequency 50/60Hz. 1 kVA single phase to split phase transformer is suitable for indoor and outdoor use.

    2kVA 120V to 120V/240V Split Phase Transformer

    $1,578.96
    SKU: ATO-DGS2kVA
    2kVA single phase to split phase isolation transformer winding material can choose copper wire or aluminum wire, transformer wheels and shell can be customized, input voltage AC 120V/220V/230V/440V/480V is optional, output voltage 120V/240V AC.

    3kVA 220V to 120V/240V Split Phase Transformer

    $2,156.89
    SKU: ATO-DGS3kVA
    3kVA single phase to split phase transformer convert AC220V to 120V/240VAC, the primary voltage can also choose 110V, 208V, 240V, 380V, 415V, 440V and 480V, 50/60Hz frequency, transformer is powerful and reliable, with low cost and high efficiency.

    4kVA 208V to 120V/240V Split Phase Transformer

    $2,384.98
    SKU: ATO-DGS4kVA
    Single phase to split phase for sale, 4kVA capacity, primary voltage 208V, 220V, 230V, 380V, 440V or 480V is available, secondary voltage 120V/240V AC (L1, L2, N, L+L=240V, L+N=120V), transformer housing and wheels can be customized.

    5kVA 230V to 120V/240V Split Phase Transformer

    $2,998.89
    SKU: ATO-DGS5kVA
    Single phase to split phase transformer rated value 5kVA, equipped with housing and wheels, input voltage AC 230V/240V/480V is available, output voltage 120V/240VAC. Winding material can choose aluminum or copper wire, frequency 50/60Hz.

    8kVA 240V to 120V/240V Split Phase Transformer

    $3,765.98
    SKU: ATO-DGS8kVA
    8kVA single phase to split phase transformer for 50/ 60Hz AC circuit, convert the input voltage AC 240V to the output voltage 120V/240V AC. The characteristics of low cost and environmental protection and energy saving make this transformer an ideal choice for various applications.

    10kVA 380V to 120V/240V Split Phase Transformer

    $4,523.98
    SKU: ATO-DGS10kVA
    Single phase to split phase transformer rated value 10kVA, transform primary voltage AC380V to secondary voltage 120V/240VAC (L1, L2, N, L+L=240V, L+N=120V), applies to AC 50/ 60Hz. Low price and superior performance make this transformer more advantageous.

    15kVA 415V to 120V/240V Split Phase Transformer

    $5,538.69
    SKU: ATO-DGS15kVA
    15kVA single phase to split phase distribution transformer step down 415V input voltage to 120V/240V output voltage, frequency 50/60Hz, winding material can choose aluminum or copper wire. Overload Capacity allows working at 1.2 times the rated load for up to 1 hour, making the single-phase transformer safe and reliable.

    20kVA 440V to 120V/240V Split Phase Transformer

    $6,298.76
    SKU: ATO-DGS20kVA
    Single phase to split phase transformer is an automation distribution transformer, capacity 20kVA, convert primary voltage 440V to secondary voltage 120V/240V. Low heat emission makes this transformer energy-saving and environmentally friendly.

    A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to step up or step down voltages and works on the magnetic induction principle. When an AC current is passed through the primary coil, an AC magnetic flux is generated in the iron core, causing a voltage (or current) to be induced in the secondary coil. It is composed of an iron core and a coil. The coil has two or more windings. The winding connected to the power supply is called the primary winding, and the remaining windings are called the secondary winding.

    How Does a Electrical Transformer Work?

    Transformer mainly uses the principle of electromagnetic induction to work. The specific process is when an AC voltage U1 is applied to the primary side of the electrical transformer, and the current flowing through the primary winding is I1, the current will generate alternating magnetic flux in the iron core, which makes the primary winding and the secondary winding electromagnetically connections.

    Working principle of transformer

    According to the principle of electromagnetic induction, the electromotive force will be induced when the alternating magnetic flux passes through these two windings. Its magnitude is proportional to the number of winding turns and the maximum value of the main magnetic flux. The voltage on the side with more winding turns is higher, and the voltage on the side with less winding turns is lower. When the secondary side of the transformer is open, that is, when the transformer is no-load, the voltage at the primary and secondary terminals is proportional to the number of turns of the primary and secondary windings. That is, U1/U2=N1/N2, but the primary and secondary frequencies are consistent, so as to realize the voltage change. The working principle of the transformer can be understood from the figure below.

    What Types of Step UP & Step Down Transformer for Sales on ATO.com?

    Isolation transformer

    Isolation transformerIsolation transformer refers to a transformer with electrical isolation between the input winding and the output winding. It is widely used in the electronic industry or industrial and mining enterprises, machine tools and mechanical equipment in the general circuit control power supply, safety lighting and indicator power. It can completely insulate the electrical on the primary side and the secondary side, and also isolate the circuit. In addition, the high-frequency loss of its iron core is used to prevent high-frequency clutter from entering the control loop. Using an isolation transformer to suspend the secondary to the ground can only be used in occasions where the power supply range is small and the line is short. At this time, the capacitance current of the system to ground is too small to cause personal injury. Another important role is to protect personal safety! It can isolate people from dangerous voltages.

    Toroidal transformer

    Toroidal transformerToroidal transformer is a kind of step-up & step-down transformer power supply, which has the advantages of small volume, low noise, less heat and high performance. Generally, we use a variety of voltages, such as 220V for domestic lighting, 36V for industrial safety lighting, and the voltage of the welding machine needs to be adjusted. These cannot be separated from the toroidal transformer, which can step down the voltage we need through the principle of electromagnetic mutual inductance of the main and auxiliary coils. But how to improve the conversion efficiency of toroidal transformers has been a problem for many people. In fact, the conversion rate of a toroidal transformer is determined by the transformer's power, production materials, and its work site.

    Control transformer

    Control transformerControl transformer is a small dry-type transformer, which is mainly used to change the voltage of AC power. It is wound by an iron core and a coil. It can change not only the voltage of the alternating current, but also the impedance. When the design power is not exceeded, the current can also be changed. In different environments, the transformer also has different applications. Generally, it is used as a control lighting and indicator light source for electrical appliances in machine tools and mechanical equipment. The multi tapped control transformer can also be used in the chemical industry as a rectifier transformer. At this time, it is only required to rewire the adjustment taps of the control transformer, cut off all power to the equipment, and then adjust the voltage to the control transformer with voltage regulating equipment on both sides, so that it can be used in the chemical industry.

    Autotransformer

    autotransformerAutotransformer is a transformer whose windings are primary and secondary in the same winding, the primary and secondary windings are directly connected in series, and the transformer is self-coupled. Ordinary transformers transfer energy through electromagnetic coupling of primary and secondary coils, and there is no direct electrical connection between primary and secondary, while autotransformer has direct electrical connection between primary and secondary, and its low voltage coil is part of high voltage coil. Autotransformers are also used as protection equipment for communication lines.

    Since the calculated capacity of an autotransformer is less than the rated capacity. Therefore, for the same rated capacity, the main dimensions of the autotransformer are smaller and the effective material (silicon steel sheet and conductors) and the construction material (steel) are reduced accordingly, thus reducing the cost. The reduction of effective materials leads to a corresponding reduction of copper and iron consumption, so the efficiency of the autotransformer is higher. Also, due to the reduction of the main dimensions and mass, it is possible to manufacture transformers with larger capacities per unit under tolerable transportation conditions.

    What's the Functions of a Power Transformer?

    Ensure the safety of electricity

    There are many types of power transformers, but each type of transformer is a device that uses the principle of electromagnetic induction to change the AC voltage. Therefore, the use of each transformer can ensure the safety of electricity. By changing the AC voltage without changing the power source, the current can be changed, which essentially enables people to use electricity safely.

    Use transformer to step up and step down

    The transformer can make voltage step up & down. We often use various voltages. For example, we need different voltages for household lighting power and industrial safety power. All of these are inseparable from the transformer. Using the transformer, we can reduce the voltage to the required voltage through the principle of electromagnetic mutual inductance, and reduce the voltage loss.

    Impedance matching voltage

    This function is most commonly used in electronic circuits. Generally speaking, electronic factories will use transformers for impedance matching to make the signal flow smoothly. Therefore, companies that require different voltages in the same environment can manufacture multi-winding transformers to satisfy the daily needs of workers.

    Something Should be Known Before Operating the Transformer

    Before the step up or step down transformer is used, it should be fully tested to ensure the safe and stable operation. The detection of transformer before operation mainly includes the following points.

    • According to the requirements of actual production for transformers and the relevant national standards for transformer operation, the DC resistance and insulation resistance of transformers are tested.
    • They should be tested if they are in the specified range.
    • The safe operation of transformer has clear requirements for grounding, so grounding resistance and neutral grounding at low voltage side should be tested. Moreover, the standardization of shell grounding should be guaranteed. Check whether these grounding points are in accordance with the specifications and ensure the stability of the grounding.
    • Ensure that respirators and explosion-proof tubes are within specified requirements, and check whether damp agent and explosion-proof film can be used properly.
    • Check all the wire connections of the transformer, and guarantee the firmness of wiring and the correctness of phase matching.
    • Check the performance of each sealing device to ensure good tightness, particularly the vent valve, casing pipe and oil cover, prevent the leakage caused by poor sealing.
    • Check whether the oil level in the conservator is consistent with the operating environment.