Low Voltage Instrument Transformers

TWB SA manufactures all types of low voltage instrument transformers, current and voltage, 0.75kV and 1 kV, for indoor as well as for outdoor applications, according to IEC 61869-1. They are window, wound or split core type. They are either encapsulated by a high grade flame self-extinguishing polycarbonate housing or resin impregnated.

Apart from these types, we are able to manufacture any other special types upon request.

Rated insulation level	0,72 kV and 1 kV
Frequency	50 / 60 Hz
Rated primary current	up to 2500 A
Rated secondary current	1 A or 5 A
Accuracy class	0,1 up to 3 for measuring and 5P or 10P for protection
Rated thermal current	I_th = 60 x I_N
Dynamic current	I_dyn= 2,5 x I_th