Current transformers - low voltage measuring... - with Isn=20 mA

Current transformers with secondary current I_sn= 20 mA

They can be used for the measurment and protection of electric decices.

Current transformers ELA 0m type with transmission 1 A/20 mA and 5 A/20 mA can be used in secondary circuit of current transformers.

Advantage of our current transformers is rated short-time thermal current (1 second): I_th = 60 * I_pn.
This current transfomers is possible to make with I_sn = 25 mA of secondary current.

Technical data:

Rated secondary current		I_sn= 20 mA
Rated primary current		I_pn= 1 ÷ 2000 A
Continuous thermal current		I_pn= ext. 120%
Rated burden		S_2n = 50 ÷ 750 W
Accuracy class		0.5; 1; 3
Rated short-time thermal current 1 sec. r.m.s.		I_th = 60 * I_pn
Rated dynamic current (for CTs with primary winding and cable type)		I_dyn = 2.5 * I_th
Rated dynamic current (for CTs bus bar type)		depends on circuit (practically unlimited)
Rated frequency		f = 50 ÷ 60 Hz
Max. voltage		U_m = 0.72 lub 1.2 kV
Test voltage		U_p = 3 lub 6 kV

Type/Technical data	Rated primary current	Rated secondary current	Accuracy class
with primary winding
ELA 0m	1 ÷ 20 A	20 mA	0.5
ELA 1m W20	5 ÷ 300 A	20 mA	0.5
cable type
ELA 0m	50 ÷ 150 A	20 mA	0.5
ELA 1m	50 ÷ 600 A	20 mA	0.5; 1; 3
bus bar type
ISN 1m	50 ÷ 800 A	20 mA	0.5; 1; 3
ISN 2m	100 ÷ 1250 A		0.5; 1; 3
ISN 3m	400 ÷ 2000 A		1
ISN 30m	300 ÷ 2000 A
ISN 31m; ISN 32m	500 ÷ 3000 A
ISN 4m	500 ÷ 3000 A

Caution! Without burden secondary circuit must be shorted!

Informations about other solutions and detailed technical informations are available in our Technical Department:
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