Mains-Frequency CT - Sirio Inductive Components

Mains frequency current transformers

Being characterized by a high number of turns in the secondary winding, mains frequency current transformers provide a low output current. By connecting a resistor to the transformer’s secondary winding, a voltage signal can be obtained that is isolated from the mains and proportional to the primary current. Given the low secondary current, the load resistor can have a low-power rating and therefore it can be connected directly to the printed circuit board.

The typical operating temperature is –40 to +70°C. The housing is made of UL94-V0 material.

Based on the size, and specifically the size of the central hole for the cable or the bus bar, there are four families of current transformers, with either pin or faston connection options.

Series 150 - Rated currents up to 600 Arms

Code	I_p [Arms]	I_s [Arms]	n	R_c [Ω]	U_out [Vrms]	Outputs	D [mm]	Drawing
TA 150120	400	0,400	n_1-4 = 1000	20	8,0	Faston 1-4	26	150A
TA 150130	200 400 600	0,400 0,400 0,400	n_1-4 = 500 n_1-4 = 1000 n_1-4 = 1500	20 20 20	8,0 8,0 8,0	Faston 1-2 Faston 1-3 Faston 1-4	26	150C
TA 150140	400	0,200	n_1-4 = 2000	20	4,0	Faston 1-4	26	150A
TA 150150	200 300 400	0,200 0,200 0,200	n_1-4 = 1000 n_1-4 = 1500 n_1-4 = 2000	20 20 20	4,0 4,0 4,0	Faston 1-2 Faston 1-3 Faston 1-4	26	150C
TA 150160	600	0,600	n_1-4 = 1000	10	6,0	Faston 1-4	26	150A
TA 150170	600	0,200	n_1-4 = 3000	20	4,0	Faston 1-4	26	150A

Series 151 - Rated currents up to 200 Arms

Code	I_p [Arms]	I_s [Arms]	n	R_c [Ω]	U_out [Vrms]	Outputs	D [mm]	Drawing
TA 151008	200	0,200	n_1-4 = 1000	10	2,0	Faston 1-4	18	151A
TA 151100	100	0,200	n_1-4 = 500	20	4,0	Faston 1-4	18	151A
TA 151104	50 100 200	0,200 0,200 0,200	n_1-4 = 250 n_1-4 = 500 n_1-4 = 1000	40 40 40	8,0 8,0 8,0	Faston 1-2 Faston 1-3 Faston 1-4	18	151C
TA 151110	25 50 100	0,200 0,200 0,200	n_1-4 = 125 n_1-4 = 250 n_1-4 = 500	20 20 20	4,0 4,0 4,0	Faston 1-2 Faston 1-3 Faston 1-4	18	151C
TA 151113	100	0,100	n_1-4 = 1000	20	2,0	Faston 1-4	18	151A

Series 152 - Rated currents up to 100 Arms

Code	I_p [Arms]	I_s [Arms]	n	R_c [Ω]	U_out [Vrms]	Outputs	D [mm]	Drawing
TA 152023	25	0,050	n_1-2 = 500	40	2,0	Pins 1-2	13	152B
TA 152025	25	0,050	n_1-2 = 500	40	2,0	Faston 1-2	13	152A
TA 152027	50	0,050	n_1-2 = 1000	80	4,0	Pins 1-2	13	152B
TA 152050	50	0,050	n_1-2 = 1000	80	4,0	Faston 1-2	13	152A

Series 153 - Rated currents up to 70 Arms

Code	I_p [Arms]	I_s [Arms]	n	R_c [Ω]	U_out [Vrms]	Outputs	D [mm]	Drawing
TA 153001	70	0,140	n_1-2 = 500	25	3,5	Faston 1-2	9	153A
TA 153002	70	0,070	n_1-2 = 1000	50	3,5	Faston 1-2	9	153A
TA 153003	70	0,035	n_1-2 = 2000	100	3,5	Faston 1-2	9	153A
TA 153006	70	0,140	n_1-2 = 500	25	3,5	Pins 1-2	9	153B
TA 153007	70	0,070	n_1-2 = 1000	50	3,5	Pins 1-2	9	153B
TA 153008	70	0,035	n_1-2 = 2000	100	3,5	Pins 1-2	9	153B

The current transformer characterization for line frequency measurements refers to the following quantities:

n ratio between primary current and secondary current (it typically corresponds to the number of turns of the secondary winding)
R_S secondary winding resistance
I_p rms primary current rating
I_S rms secondary current rating
f_n nominal operating frequency (or optimal frequency range)
R_C nominal load resistance
U_OUT output voltage at nominal current over nominal load resistance
E maximum measurement error at nominal current and load
U_is maximum primary/secondary operating voltage
U_p primary/secondary insulation voltage

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