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Current transformers with secondary current Isn = 20 mA

Current transformers with secondary current Isn = 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): Ith = 60 * Ipn.
This current transfomers is possible to make with Isn = 25 mA of secondary current.

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Technical data

Rated secondary current Isn = 20 mA
Rated primary current Ipn = 1 ÷ 2000 A
Continuous thermal current Ipn = ext. 120%
Rated burden S2n = 50 ÷ 750 Ω
Accuracy class

0.5; 1; 3

Rated short-time thermal current 1 sec. r.m.s. Ith = 60 * Ipn
Rated dynamic current
(for CTs with primary winding and cable type)
Idyn = 2.5 * Ith
Rated dynamic current
(for CTs bus bar type)
depends on circuit (practically unlimited)
Rated frequency f = 50 ÷ 60 Hz
Max. voltage Um = 0.72 lub 1.2 kV
Test voltage Up = 3 lub 6 kV

Product specification

Type/Technical data Rated primary current Rated secondary current Accuracy class
with primary winding

ELA 0m

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1 ÷ 20 A 20 mA 0.5

ELA 1m W20

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5 ÷ 300 A
cable type

ELA 0m

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50 ÷ 150 A 20 mA 0.5

ELA 1m

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50 ÷ 600 A 0.5; 1; 3
bus bar type

ISN 1m

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50 ÷ 800 A 20 mA 0.5; 1; 3

ISN 2m

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100 ÷ 1250 A

ISN 3m

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400 ÷ 2000 A 1

ISN 30m

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300 ÷ 2000 A

ISN 31m; ISN 32m

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500 ÷ 3000 A

ISN 4m

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500 ÷ 3000 A