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With regular maintenance, SACE Emax circuit-breakers, either with or without a geared motor, can withstand the following operation without
replacement of parts.
Rated uninterrupted current
Iu (40 °C)
[A]
E1 B-N
800
1000-1250
1600
E2 B-N-S
800
1000-1250
1600
2000
E2 L
1250
1600
E3 N-S-H-V
800
1000-1250
1600
2000
2500
3200
E3 L
2000
2500
E4 S-H-V
3200
4000
E6 H-V
3200
4000
5000
6300
(*) With regular ordinary maintenance
8.2
Maintenance program
Maintenance operations
General inspection (see par. 8.3.2)
External visual check and inspection
of the power section
Operating mechanism maintenance (par. 8.3.4)
Checking trip of the release
8.3
Maintenance operations
8.3.1
Preliminary operations
– Remove the flange (1) of the release, turning the screws (2) as shown in the figures
– Remove the front escutcheon plate (3) by removing the four screws (4)
– Remove, if present, one or both side guards (5) by removing the front (6) and lateral (7) screws
– Remove the arcing chambers (8) by removing the screws (9).
6
2
1
4
Fig. 32
L2234
Model
L2778
Mechanical life (*)
No. of operations Frequency
x 1000
operations/hour No. of operations x 1000
25
60
25
60
25
60
25
60
25
60
25
60
25
60
20
60
20
60
20
60
20
60
20
60
20
60
20
60
20
60
15
60
15
60
15
60
15
60
12
60
12
60
12
60
12
60
Interval
Installation in normal rooms
One year or after a short-circuit trip
One year
One year or 10000 operations
One year
9
7
5
3
E1-E3
Electrical life
440 V ~
10
10
10
15
15
12
10
4
3
12
12
10
9
8
6
2
1.8
7
5
5
4
3
2
8
6
2
1
4
Apparatus
Doc. No.
690 V ~
No. of operations x 1000
10
8
8
15
15
10
8
3
2
12
12
10
9
7
5
1.5
1.3
7
4
5
4
2
1.5
Installations in dusty or polluted rooms
Six months or after a short-circuit trip
Six months
Six months or 10000 operations
Six months
7
5
3
Emax
1SDH000460R0002
Frequency
operations/hour
30
30
30
30
30
30
30
20
20
20
20
20
20
20
20
20
20
10
10
10
10
10
10
9
8
E4-E6
Scale
Page No.
20/158
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