Tortech

An isolation transformer is a transformer, often with symmetrical windings, which is used to decouple two circuits. An isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. They also block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment such as computers or laboratory instruments.
In electronics testing, troubleshooting and servicing, an isolation transformer is a 1:1 power transformer which is used as a safety precaution. Grounded objects near the device under test (desk, lamp, concrete floor, oscilloscope ground lead, etc.) may be at a hazardous potential difference with respect to that device. By using an isolation transformer, the bonding is eliminated, and the shock hazard is entirely contained within the device.
Isolation transformers are also used for the power supply of devices not on ground potential as one option. 
Isolation transformers are commonly designed with careful attention to capacitive coupling between the two windings. This is necessary because excessive capacitance could also couple AC current from the primary to the secondary. A grounded shield is commonly interposed between the primary and the secondary. This greatly reduces the coupling of common-mode noise present on supply conductors.
Differential noise can magnetically couple from the primary to the secondary of an isolation transformer. This requires other measures, such as a filter, to block differential noise from the secondary of an isolation transformer.
Note: Tortech isolation 240/240v transformers include a grounded shield between the primary and the secondary windings as a standard accessory. This screen has a very high coupling to the input winding. Hence it will reduce the common mode noise.
   NEW!  Models Now Available with E/S Screen and On / Off  Switch - At Reduced Prices !

•  High Quality Toroidal Isolation Units

• All units are Fully enclosed

• Input voltage 240V ±10% 50Hz. Australian flex and plug

• Output voltage 240V Unregulated. Australian female chassis socket