Table of Contents
5.4
Conversion of the auxiliary contacts or of the signalling contacts (disconnected - test isolated - connected), from normally
closed (opening) to normally open (closing) or vice versa
The contacts are wired at the factory as shown on the electrical circuit diagram. If it is necessary to change their state for installation requirements,
proceed as follows.
a) Auxiliary contacts
To access the auxiliary contacts, carry out the following operations:
– remove the front protection (3) of the release by taking action on the blocks (1) as shown in the figure
– remove the protection release (4) removing the side nuts (2) and then sliding the release out from the front of the circuit-breaker.
1
3
Fig. 21
Being of the two-way type (changeover contacts), the auxiliary contacts can be modified from break contacts to make contacts and vice versa
simply by moving the output conductor from one position to the other, as shown in the figure (example for PR121).
N.C. contact
Sliding contacts
Fig. 22
b ) Signalling contacts disconnected - test isolated -
connected
To change the state of the position contact, proceed in the same way
as explained for the auxiliary contacts.
L2234
Model
L2778
2
4
N.O. contact
Apparatus
Doc. No.
Terminal box
Emax
1SDH000460R0002
Scale
Page No.
14/158
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