ESS20-0 datasheet(4/6 Pages) ETAL

4 / 6 page

Electronic Circuit Breaker ESS20-0...

www.e-t-a.de

Electronic Circuit Breaker ESS20-0...

1646

disconnection

typically 1.1 x I

current limitation

typically 1.8 x I

10000

1000

...times rated current

100

0. 1

0.01

1.8 x I

Time/Current characteristic curve (TA = 25 °C)

The trip time is typically 5 s in the range between 1.1 and 1.8 x IN*1).

Electronic current limitation starts at typically 1.8 x IN*1) which

means that under all overload conditions (independent of the

power supply and the resistance of the load circuit) the max.

overload until disconnection will not exceed 1.8 x IN*1) times

the current rating. Trip time is between 100 ms (short circuit

current IK) and 5 sec (at overload with high line attenuation).

Without the current limitation activated at typically 1.8 x IN*1) a

considerably higher overload current would flow in the event of

an overload or short circuit.

After detection of an overload or short circuit the LED changes

colour from GREEN to ORANGE. The LED will no longer be

lighted after the circuit breaker has tripped.

Resetting the circuit breaker is not possible before the integral

bimetal has cooled down (approx. 10 sec).

Table 2: Reliable trip of ESS20

*1) current limitation typically 1.8 x IN times rated current at

IN = 0.5 A...6 A

current limitation typically 1.5 x IN times rated current at

IN = 8 A...10 A

Reliable trip of ESS20 with different cable lengths and cross sections

Resistivity of copper 0 = 0.0178 (Ohm x mm2) / m

US = DC 19.2 V (= 80 % v. 24 V)

voltage drop of ESS20 and tolerance of trip point (typically 1.1 x IN = 1.05...1.35 x IN)

have been taken into account.

ESS20-selected rating IN (in A) ➞

e. g. trip current Iab = 1.25 x IN (in A) ➞

Rmax in Ohm = (US / Iab) - 0.050 ➞

3.75

7.5

➞

ESS20 trips after 3...5 s

5.07

2.51

The ESS20 reliably trips from 0 Ohm to max. circuitry resistance Rmax

Cable cross section

A in mm2 ➞

0.14

0.25

0.34

0.5

0.75

1.5

cable length

L in meter (= single length)

cable resistance in Ohm = (R0 x 2 x L) / A

1.27

0.71

0.52

0.36

0.24

0.18

0.12

2.54

1.42

1.05

0.71

0.47

0.36

0.24

3.81

2.14

1.57

1.07

0.71

0.53

0.36

5.09

2.85

2.09

1.42

0.95

0.71

0.47

6.36

3.56

2.62

1.78

1.19

0.89

0.59

7.63

4.27

3.14

2.14

1.42

1.07

0.71

8.90

4.98

3.66

2.49

1.66

1.25

0.83

10.17

5.70

4.19

2.85

1.90

1.42

0.95

11.44

6.41

4.71

3.20

2.14

1.60

1.07

12.71

7.12

5.24

3.56

2.37

1.78

1.19

19.07

10.68

7.85

5.34

3.56

2.67

1.78

100

25.34

14.24

10.47

7.12

4.75

3.56

2.37

125

31.79

17.80

13.09

8.90

5.93

4.45

2.97

150

38.14

21.36

15.71

10.68

7.12

5.34

3.56

175

44.50

24.92

18.32

12.46

8.31

6.23

4.15

200

50.86

28.48

20.94

14.24

9.49

7.12

4.75

225

57.21

32.04

23.56

16.02

10.68

8.01

5.34

250

63.57

35.60

26.18

17.80

11.87

8.90

5.93

Example 1:

max. length at 1.5 mm2 and 3 A ➞

214 m

Example 2:

max. length at 1.5 mm2 and 6 A ➞

106 m

Example 3:

mixed wiring:

R1 = 40 m in 1.5 mm2 and R2 = 5 m in 0.25 mm2:

(Control cabinet – sensor/actuator level) R1 = 0.95 Ohm, R2 = 0.71 Ohm

Total (R1 + R2) = 1.66 Ohm

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