Products / Current Transformers

Current Transformers

Series: TTSC and TTHC – 22, 38

Current transformers in vertical version enable space economising, compact printed circuit board assembly.
The simple construction enables high performance parameters with low heat development and an optimum price-performance ratio.
The customer has a choice between two closed housings.
Current transformers are simple, passive components for the purpose of converting high operating currents into rather smaller measuring currents. A distinction is made between the types Universal (TTSC) with 3% accuracy
and High Performance (TTHC) with 1% precision.
With the ideal “galvanic separation” resulting from the structure and construction the safety requirements of industry are fulfilled in full.

Specification Sheet

Primary current I_n	: up to 50 Amp. AC 50/60 Hz
Resolution	: 3% TTSC types, 1% TTHC types
Isolation stability	: 4 kVAC
Operating temperature	: -40°C up to +70°C
Climatic class	: 40/70/21 as per IEC 60068-1
Inflammability	: UL 94 V-0

DEFINITIONS

Definitions

N	turn ratio or voltage ratio between primary and secondary windings.
∫Udt	voltage-time area (Vμs) This is the product of impulse height and pulse width measured at half impulse height.
t_r	Pulse rise time (μs) This time is measured from 10% ÷ 90% of the pulse height.
I_f	Firing current (A) Max. available pulse current.
L_P	Primary inductance (mH) Measured as per EN 60938 ( signal 0.1mA, tolerance -30 +50%).
C_C	Coupling capacity (pF) Measured between primary and secondary winding. Is heavily dependent on the winding structure.
U_R	Maximum operating voltage (V)
U_P	Test voltage (kV) Measured between primary and secondary winding Also dependent on the winding structure. Measurement 100% in the final test (up to 3.5 kV AC for 2 seconds).
U_G	Glow discharge voltage (V) Determines the life expectancy of the IT's in operation with excessive operating voltage. At least 50% higher than the max. operating voltage.
P_d	Maximum power loss at 50°C ambient temperature.