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.
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 |
1 ÷ 20 A | 20 mA | 0.5 |
|
ELA 1m W20 |
5 ÷ 300 A | ||
| cable type | |||
|
ELA 0m |
50 ÷ 150 A | 20 mA | 0.5 |
|
ELA 1m |
50 ÷ 600 A | 0.5; 1; 3 | |
| bus bar type | |||
|
ISN 1m |
50 ÷ 800 A | 20 mA | 0.5; 1; 3 |
|
ISN 2m |
100 ÷ 1250 A | ||
|
ISN 3m |
400 ÷ 2000 A | 1 | |
|
ISN 30m |
300 ÷ 2000 A | ||
|
ISN 31m; ISN 32m |
500 ÷ 3000 A | ||
|
ISN 4m |
500 ÷ 3000 A | ||