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Toroidal Core Isolation Transformer
Instruction Manual
2. Operation of the Isolation Transformer
Before using the isolation transformer make sure that the configuration of all connections correspond to the
selected application:
a. To protect from electric shock when operating or repairing AC devices
If this isolation transformer is used to protect from electric shock when operating or repairing AC devices, make
sure that the connected device will not be connected to the ground of the transformer.
b. To protect from electric shock when testing electrical devices with a measuring device
If an isolation transformer is used in the testing of electrical equipment it is always the measured object but not
necessarily the measuring device (such as an oscilloscope) that has to be connected to an isolation transformer.
Make sure that the measured object will not be connected to the ground of the transformer.
c. To avoid corrosion and protect from electric shock when using AC shore power
on a boat or ship
If this isolation transformer is used to connect a boat or ship to shore power, make sure that the secondary circuit
will not be connected to the ground of the transformer. Instead, the neutral and ground wires have to be bridged
at the secondary side of isolation transformer. Thus, any leaking current will return to the transformer on the boat
or ship, protecting everyone in the water.
It will furthermore prevent galvanic corrosion, which can occur if boats or ships in a marina or in a harbor are
connected through the ground connection of a shared power supply. Galvanic corrosion affects the metal
underwater parts, such as ship propellers or metal fittings, and it is prevented by isolating the circuit on the boat
or ship (secondary circuit) from the shore power (primary circuit). On the secondary side of the isolation
transformer we recommend to use an RCD (residual current device), which will interrupt the circuit in case of an
unequal amount of current at L and N.
Procedure:
(1) Before connecting electrical devices to this isolation transformer make sure that the power of the connected
devices will not exceed the capacity of the isolation transformer.
For continuous operation the load from the connected devices should not exceed 80% of the power of the transformer.
(2) Make sure that input voltage corresponds with allowable input of the transformer.
(3) Connect the isolation transformer with the power supply. Always make sure that the transformer is connected to
the ground connection of the power supply.
(4) Connect your appliance to the isolation transformer. Make sure that all appliances are turned off when connecting
them with the isolation transformer.
(5) Push the power switch off the isolation transformer to the 'ON' position and wait until the green LED will light up.
(6) Turn on your appliance.
(7) The circuit breaker trips and opens the circuit if the transformer is overloaded with too much power from the connected
appliances. If this happens, unplug the transformer from the power supply and remove all connected appliances.
Turn off the power switch off the transformer and press the circuit breaker. Wait a few minutes. Restart at (1).
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