Isolation Transformer

Electrical power from a source of alternating

An Isolation Transformer is a transformer used to transfer electrical power from a source of alternating current (AC) power to some equipment or device while isolating the powered device from the power source, usually for safety reasons. Isolation transformers provide galvanic isolation and are used to protect against electric shock, to suppress electrical noise in sensitive devices, or to transfer power between two circuits which must not be connected. A transformer sold for isolation is often built with special insulation between primary and secondary, and is specified to withstand a high voltage between windings.

Isolation transformers block transmission of the DC component in signals from one circuit to the other, but allow AC components in signals to pass. Transformers that have a ratio of 1 to 1 between the primary and secondary windings are often used to protect secondary circuits and individuals from electrical shocks. Suitably designed isolation transformers block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers, medical devices, or laboratory instruments.

Input Voltage As required
Acceptable Input Voltage +/- 10 % ac
Mode of Operation 1 : 1 or Step up or Step down
Common Mode Reflection Transients, Spikes, Surges
Coupling Capacitance Less than 0.005 pf
Insulation Resistance More than 1000 Mohms
Dielectric Strength 2500 V AC for 2 Minutes
Load Regulation 3.5 %
Capacity 0.5 KVA to 1000 KVA