Application
3TL vacuum contactors are 3-pole
contactors with electromagnetically-operated mechanism for medium-voltage switchgear.
They are load-break switchgear with a
limited short-circuit making and
short-circuit breaking capacity and are
used for high switching frequencies
( > 10, 000 operating cycles) .
The vacuum contactors are suitable for
operational switching of AC loads in
indoor and can perform, for example, the
following switching duties:

Switching of three-phase motors in
AC-3 and AC-4 operation

Switching of transformers

Switching of reactors

Switching of ohmic loads ( e.g. arc furnaces)

Switching of capacitors
With reversing contactor combinations,
only one contactor is required for each
direction of rotation, if HV HRC fuses are
used for short-circuit protection.
Application examples

Conveyor and lift systems

Pump stations

Ventilation and heating

Systems for reactive-power compensation
for the following branches of industry:

Mining

Steel

Gas and petrochemicals

Paper

Cement