Stepdown transformer

Keystone’s step down transformers are ideal for powering down from a 480V or 347V system to a 277V system, rated up to 375W. Utilizing a precision wound core and coil integrated design, these auto transformers provide a safe and reliable solution for effective power conversion to use standard 277V or multi-voltage lighting ballasts. Keystone’s step down auto transformers are non-isolated, making them compact and lightweight compared to isolated transformers. Product Features and Benefits • Non-isolated auto transformer • 5 year limited warranty • For use with electronic LED drivers and ballasts operating at 277V input voltage • Thermally protected • UL and cUL 5085 approved Max Load Catalog Number Input Voltage Output Voltage Features Spec Sheet 70VA 480V or 347V 277V Auto-transformer, fluorescent type form factor 150VA or 125VA 480V or 347V 277V or 240V Auto-transformer, open core form factor 375VA or 270VA 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor 250VA or 180VA 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor 375VA or 270VA 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor 375VA or 270VA 480V or 347V 277V or 200V Auto-transformer, fluorescent type form factor • • • • • • • • • • (Line Voltage or Ballast Bypass) • • • • • • • • (Ballast Compatible) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • ...

A step-down transformer is one that converts high-voltage, low-current AC power to low-voltage, high-current power. Every home connected to the power grid gets its power from a step-down transformer on the power line. It reduces the transmission voltage from thousands of volts to the standard residential voltage of 240 volts, which is divided into two 120-volt legs at the main panel. Many electronic devices, such as phone chargers and laptops, employ step-down transformers in their power plugs to convert 120-volt electricity to a much lower voltage. In addition, home heating systems with thermostats and doorbells have step-down transformers. If you travel to a country with 240-volt power at the outlets, you need a step-down transformer to operate your 120-volt appliances. It's rare for transformers to malfunction, but they can overheat when supplying power on a continuous basis for an extended period of time. One of the transformer connections might melt, or a break may develop in one of the wires. You can test any transformer, including a phone charger transformer, using a multimeter. In output transformer testing, you use the voltmeter setting to check the output voltage while the transformer is connected to power. In a transformer continuity test, you disconnect the transformer from power and check resistance in both the input and output coils using the ohmmeter function. AC power supplied to the input coil induces a magnetic field in the core which in turn induces a cu...