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PR122 and PR123 microprocessor-based electronic releases may used combination with external toroid located the conductor, which
connects the star center the MV/LV transformer (homopolar transformer) earth: this case, the earth protection defined Source Ground
Return.
The accessory for installation the busbars and available different sizes: 3200A for three- and four-pole circuit-breakers, 4000A
for three-pole circuit-breakers.
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In addition the circuit-breaker lock the connected test isolated disconnected position, this allows locking only the disconnected test
isolated positions. For
the change over, the circuit-breakers must supplied with the necessary accessories for the electrical remote control and for electrical and
mechanical interlocks provided for the changing over.
b) iP54 door protection
This provided means transparent plastic escutcheon plate which fully protects the front the circuit-breaker and ensures degree
of protection IP54.
Reference figure the electrical circuit diagrams: UI/0.
Model 2234 Apparatus Scale
L 2778
Doc-Na 1SDH000460R0002
Page No. The circuit-breakers can installed vertically horizontally.
27/158
.
10.
Only available for circuit-breakers withdrawable versions for installing the moving part.
c) ircuit-breaker lock connected test isolated disconnected position
This device can controlled special circular lock with different keys (for single circuit-breaker) with the same keys (for several circuit-
breakers available four different key code numbers) and padlocks (up padlocks, not supplied mm). The accessory fitted with dip-switch multiple selector which reset according the required sensitivity (3A 30A).
The the toroid can regulated 100 250 400 800 using different combinations the connections.
Only available for circuit-breakers withdrawable versions for installing the fixed part.
- padlocks (b): padlocks (not supplied): mm. The indication visible the front the circuit-breaker from the outside. indicates the number circuit-breaker mechanical
operations.
The change over from the normal supply the emergency supply, can done manually (with local remote control) automatically.
The accessories can for example:
- the shunt opening release
- the shunt closing release
- the motor operator
- the auxiliary contacts.
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This mechanism makes the mechanical interlock between two three circuit-breakers (even different sizes and any fixed/withdrawable version)
by means flexible cable.
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This connected the operating mechanism means simple lever mechanism.
c) Hom opolar for residual current protection
The toroid enables the residual current protection activated and can combined with the PR122/P LSIRc, PR122/P LSIG releases (with
PR120/V) and PR123/P.
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a) Protection covers for opening and closing pushbuttons
These protection covers, applied over the opening and closing pushbuttons, prevent the corresponding circuit-breaker operations except by
using special tool. the latter
case, four different key code numbers are available.2 ica s
a-b) Lock open position
Different mechanisms are available which enable the circuit-breaker locked the open position. Only available for circuit-breakers withdrawable versions for installing the moving part. Mounted hinges, fitted with key lock. The electrical circuit diagram for the electrical changeover means relay (to provided the customer)
is supplied with the mechanical interlock.
These devices can controlled by:
- key (a): special circular lock with different keys (for single circuit-breaker) with the same keys (for several circuit-breakers).
e) ccessories for shutter padlocks
They enable the shutters padlocked (installed the fixed part) the closed position.
f) echanical lock com partm ent door
This prevents the compartment door from being opened when the circuit-breaker closed (and connected the case withdrawable circuit-
breakers) and prevents circuit-breaker closing with the compartment door open.
- supply essential parts the installation, other than the safety services.
4 types interlocks are available:
type between circuit-breakers (power supply emergency)
type between circuit-breakers power supplies emergency)
type between circuit-breakers power supplies bus-tie)
type between circuit-breakers power supplies single closed circuit-breaker)
The emergency power supply generally supplied order substitute the normal power supply two cases:
- supply safety services for people
