ABB HD4/R User Manual

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5.3 Operating mechanism
The ESH operating mechanism with energy stored by means
of preloaded springs is used for fixed or plu-in HD/4... circuit-
breakers.
The closing springs of the ESN operating mechanism are load-
ed in the manual mode using the special removable lever.
The opening springs are automatically reloaded during the
closing operation.
Ifagearmotorisinstalled,theclosingspringsareautomatically
loadedaftereachclosingoperation.Theshuntclosing,shunt
opening and undervoltage releases allow the operations to be
carried out in the remote mode.
5.4 Fixed circuit-breakers
Thefixedcircuit-breaker(fig.4)isthebasicversion,previously
described in sect. 5.2. There are two drilled supports in the
lower part of the structure to allow the circuit-breaker to be
fixed.
The terminal box (17) is available for the electrical connections
ofthecircuit-breaker’sauxiliarycircuits,inthefrontprotection.
The earthing screw is located at the side of the circuit-breaker.
Key
1 SF
6
gas pressure signalling device (on request - only
for circuit-breakers with pressure switch)
2 PR521 or REF 601 overcurrent relay (on request)
3 Closing pushbutton
4 Opening pushbutton
5 Circuit-breaker closed indicator
6 Circuit-breaker open indicator
7 Medium voltage terminals
8 Circuit-breaker pole
9 Current sensors (if provided)
10 Key lock
11 Fixing brackets
12 Undervoltage release
13 Additional shunt opening release
14 Shunt opening release
15 Indicator for closing springs loaded (yellow) / discharged (white)
16 Lever for loading the closing springs in the manual mode
17 Circuit-breaker control circuit supporting terminal box
Figure 4

ABB HD4/R Specifications

General

Brand	ABB
Model	HD4/R
Category	Circuit breakers
Language	English