L2234
L2778
Emax
6/158
Doc. No.
Model
Apparatus
Scale
Page No.
1SDH000460R0002
1
2
3
4
3
2
4
5b
5a
6a
6b
1
7
8
15
9
12
13
14
15
12
13
14
12
3
2
4
5a
6a
1
7
8
9
11
12
10
10
11
1.3.2
Disconnector rating plate
1.4 Moving part construction characteristics
1 Supporting structure made of steel sheet
2 Current sensor for protection release
3 Terminal supporting insulating box
4 Horizontal rear terminals
5a Main fixed contact plates
5b Fixed arcing contact plates
6a Main moving contact plates
6b Moving arcing contact plates
7 Arcing chamber
Fixed circuit-breaker
Fig. 2a
Fig. 2b
1.3.1
Circuit-breaker rating plate
Fig. 3
Selective circuit-breaker
1.
Description
1.1 General characteristics
The SACE Emax series of circuit-breakers and disconnectors consists of a steel sheet structure which houses the operating mechanism, the poles
and the auxiliary parts. Each pole, insulated from the others, contains the circuit-breaking parts and the current transformer of the corresponding
phase.
The structure of the poles differs according to whether the circuit-breaker is selective or current-limiting.
The fixed version circuit-breaker has its own terminals for connection to the power circuit; in the withdrawable version the circuit-breaker comprises
the moving part of the apparatus, which is completed with a fixed part fitted with the terminals for connection to the power circuit of the installation.
The moving part and the fixed part coupled by means of special contacts installed in the fixed part.
1 PR121, PR122 or PR123
electronic microprocessor-
based release
2 Trade mark
3 Operating and control parts of
the operating mechanism and
release tripped signals
4 Rating plate
8 Terminal box for the fixed version-Sliding contacts for the withdrawable version
9 Protection release
10 Circuit-breaker closing and opening mechanism
11 Closing springs
12 Spring loading geared motor (on request)
13 Lever for manually loading the closing springs
14 Racking-out device (only for withdrawable circuit-breakers)
15 Service releases (shunt closing release, shunt opening release, undervoltage
release)(on request)
1.2 External front view of the circuit-breaker
Current-limiting circuit-breaker
Fig. 1