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    300VA Toroidal Transformer, 230V AC to 12V/24V

    $147.43
    SKU: ATO-T-C300VA
    300VA power capacity toroidal transformer is single phase, full copper design, low energy consumption, tested and approved by CE, RoHS, ISO standard, with 1 primary winding of 230V and double secondary windings of 35-0-35V, 12V or 24V 1 output is available here.

    4 kVA Isolation Transformer, Single Phase, 220V to 110V

    $1,135.24
    SKU: ATO-T-DG4KVA
    Single phase dry isolation transformer features 4 kVA power capacity, 50Hz/ 60Hz frequency, step down 220V primary voltage to 110V secondary voltage, 110V to 220V step up version or other voltages can be customized. Optional enameled copper wire or aluminum wire, IP20 enclosure type or open type.

    350VA Step-Down Toroidal Transformer, 220V AC to 12V/40-0-40V

    $153.36
    SKU: ATO-T-C350VA
    Cheap 350VA toroidal transformer with a single input of 220V AC and a output of 12V/24V, 40-0-40 volt double outputs are available, is a step down transformer, features high insulation strength, CE recognized, less noise and long life.

    4000VA Control Transformer, 240/480V to 208/110V

    $1,054.17
    SKU: ATO-T-BK4000VA
    Hot sale 4kVA single phase control transformer step down 240/480V dual input voltage to 208/110V dual output voltage, fully electric isolation between primary side and secondary sides, is suitable for circuit of AC 50/60Hz and rated voltage 500V and below.

    45 kVA 3-Phase Autotransformer, 380V to 220/200V

    $4,724.92
    SKU: ATO-T-ASG45KVA
    Provide 3-phase autotransformer for sale online, ideal price. Power rating 45kVA, designed to step down high voltage 380 volt to 220/200 volt, used in AC circuit 50 Hz or 60 Hz, available self-cooling or wind-cooled. Winding of the dry type auto-transformer is copper or aluminum for selection, voltage customization is available, wide applications.

    5 kVA Isolation Transformer, Single Phase, 230V to 120V

    $1,436.54
    SKU: ATO-T-DG5KVA
    Lower cost 5 kVA isolation transformer, single phase, to use in alternating current (AC) 50Hz or 60Hz, step down the voltage 230V to 120V or step up 120V to 230V. Copper wire or aluminum wire for optional, IP20 protection grade enclosure, dry type natural air self cooling mode.

    5000VA Control Transformer, 380V to 230/120V

    $1,264.62
    SKU: ATO-T-BK5000VA
    Dry type air cooling transformer is 1 phase 5000VA, H class enameled copper wire or aluminum wire, transforms 380 volt to 230/120 volt, input/output voltages can be customized as your need, just confirm us when place the order.

    500VA Toroidal Transformer, 230V AC to 2x12V/2x24V

    $192.78
    SKU: ATO-T-C500VA
    Customized and high quality toroidal transformer is single phase, 500VA power capacity, full copper design, less noise, with a primary voltage of 230 V AC 50 /60 Hz and twin secondary voltage of 2x12V (12-0-12) or 2x24V (24-0-24), manufactured according to CE, RoHS, ISO standard.

    75 kVA 3-Phase Autotransformer, 380V to 220/200V

    $6,599.92
    SKU: ATO-T-ASG75KVA
    3-phase autotransformer uses copper or aluminum winding, rated capacity 75 kVA, steps down the primary voltage 380V to secondary 220/200V, frequency 50/60 Hz, self-cooling or wind-cooled. Winding of the dry type auto-transformer has ≥98% high efficiency, other input/output voltages are customizable.

    8 kVA Isolation Transformer, Single Phase 120V

    $2,069.05
    SKU: ATO-T-DG8KVA
    8 kVA dry type isolation transformer for sale, single phase, 120 volt AC voltage, 1:1 ratio between the primary and secondary windings, other voltage are available for choice. Shielded isolation transformer offers 100% isolation from the input AC line, to protect against electric shock between the ground and energized conductors.

    10 kVA Isolation Transformer, Single phase, 120V to 240V

    $2,226.98
    SKU: ATO-T-DG10KVA
    Single phase 120V to 240V isolation transformer is design to use in AC circuit 50Hz or 60 Hz, 10 kVA capacity for safety. Open type and protected type versions are available, the effective performance and high quality features make it ideal for use in the electrical and the engineering industries.

    100 kVA 3-Phase Autotransformer, 380V to 220/200V

    $7,859.31
    SKU: ATO-T-ASG100KVA
    ATO dry-type autotransformer for sale, economical price. Function is step down the input voltage 3-phase 380V to 220/200V output, power rating 100 kVA, rated frequency 50/60 Hz, winding material copper/aluminum, cooling mode self/wind-cooled, primary and secondary windings are isolated with each other.

    6000VA Control Transformer, 220/440V to 120/48/12V

    $1,366.92
    SKU: ATO-T-BK6000VA
    Cheap price 6kVA single phase control transformer applicable to 50/60Hz, step down 220/440V primary voltage to 120/48/12V three groups of secondary voltages, with advantages of excellent performance, reliable operation, mainly work for control and lighting purpose.

    600VA Toroidal Transformer, 240V AC to 12V/24V

    $216.55
    SKU: ATO-T-C600VA
    600VA (600W) full power toroidal transformer is a single phase general purpose transformer with a primary voltage of 240 V AC and a secondary voltages of 12V/24V, dual outputs versions like 30-0-30V, 40-0-40V are avalible. It offers a significant size and weight reducation as well as low cost and high reliability.

    15 kVA Isolation Transformer, Single phase, 208V to 110V

    $2,786.44
    SKU: ATO-T-DG15KVA
    Affordable single phase 15 kVA isolation transformer adopts high quality material and advanced technology, it has advantages of damp- proof and convenient maintenance, mainly used in power supply occasions of AC 50~60Hz, step down or step up voltage between 110V and 208V.

    8000VA Control Transformer, 240V to 110/24V

    $1,521.54
    SKU: ATO-T-BK8000VA
    8kVA 1 phase industrial control transformer with affordable price, is suitable for circuit of AC 50/60Hz and step down 240V input voltage to 110/24V dual output voltage, fully electric isolation between primary side and secondary sides, H class enameled wired ensure long service life.

    800VA Toroidal Transformer, 230V AC to 50-0-50V

    $264.47
    SKU: ATO-T-C800VA
    Single phase dry-type toroidal transformer with 800VA (800W) full power, all copper design, single input of 230V AC, and output of 50-0-50V (2x50V), double outputs are available. Twin secondary windings may be connected in series, parallel, or used independently.

    1000VA Toroidal Transformer, 240V to 30-0-30V

    $383.25
    SKU: ATO-T-C1000VA
    Step up/step down toroidal transformer with low cost, 1000VA full power capacity, single phase, transform input voltage 240V AC to double output voltage 2x15V or 2x30V (30-0-30V), single output is available. It features high insulation strength, less noise and long life.

    10kVA Control Transformer, 230V to 110/36V

    $1,721.54
    SKU: ATO-T-BK10KVA
    Best and cheap industrial control low voltage transformer used in 50Hz/60Hz, has 10kVA power rating, designed to step down single phase 230 volt primary voltages to 110/36V dual secondary voltage, fully electric isolation between primary side and secondary sides.

    20 kVA Isolation Transformer, Single phase, 240V to 208V

    $3,388.89
    SKU: ATO-T-DG20KVA
    The 20 kVA capacity transformer from ATO is safety and isolation single phase transformer, it can step down 240 volt input voltage to output 208 volt, can step up 208 volt to 240 volt as well. This good price isolation transformer provides enhanced electrical isolation between the line supply and the application.

    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.