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14. Circuit diagrams
WARNING:
Without the auxiliary power supply 24V DC the trip unit does not work and the circuit breaker is not protected.
Before installing the circuit-breaker, carefully read note F on the circuit diagrams.
Operating status shown
The circuit diagram is for the following conditions:
- withdrawable circuit-breaker, open and racked-in
- circuits de-energised
- releases not tripped
- motor operating mechanism with springs unloaded.
Versions
The diagram shows a circuit-breaker in withdrawable version; it can be applied to a fixed version circuit-breaker as well.
Fixed version
The control circuits are fitted between terminals XV (connector X is not supplied).
With this version, the applications indicated in figures 31 and 32 cannot be provided.
Withdrawable version
The control circuits are fitted between the poles of connector X (terminal box XV is not supplied).
14.1. Caption
= Circuit diagram figure number
*
= See note indicated by the letter
A1
= Circuit-breaker accessories
A3
= Accessories applied to the fixed part of the circuit-breaker (for withdrawable version only)
A4
= Example switchgear and connections for control and signalling, outside the circuit-breaker
AY
= SACE SOR TEST UNIT Test/monitoring Unit (see note R)
D
= Electronic time-delay device of the undervoltage release, outside the circuit-breaker
F1
= Delayed-trip fuse
K51
= PR122/VF electronic release with the following protection functions:
- L overload protection with inverse long time-delay trip-setting I1
- I short-circuit protection with instantaneous time-delay trip-setting l3
K51/IN1
= Digital programmable input (available only with module PR120/K)
K51/P1...P4 = Programmable electrical signalling (available only with module PR120/K)
K51/YC
= Closing control from PR122/VF electronic release with communication module PR120/D-M
K51/YO
= Opening control from PR122/VF electronic release with communication module PR120/D-M
M
= Motor for loading the closing springs
Q
= Circuit-breaker
Q/1...27
= Circuit-breaker auxiliary contacts
S33M/1...3 = Limit contacts for spring-loading motor
S43
= Switch for setting remote/local control
S51
= Contact for electrical signalling of circuit-breaker open due to tripping of the overcurrent release. The circuit-
breaker may be closed only after pressing the reset pushbutton, or after energizing the coil for electrical reset (if
available)
S75E/1.4 = Contacts for electrical signalling of circuit-breaker in disconnected position (only with withdrawable circuit-
breakers)
S75I/1..5 = Contacts for electrical signalling of circuit-breaker in connected position (only with withdrawable circuit-breakers)
S75T/1..4 = Contacts for electrical signalling of circuit-breaker in test isolated position (only with withdrawable circuit-
breakers)
SC
= Pushbutton or contact for closing the circuit-breaker
SO
= Pushbutton or contact for opening the circuit-breaker
SO1
= Pushbutton or contact for opening the circuit-breaker with delayed trip
SO2
= Pushbutton or contact for opening the circuit-breaker with instantaneous trip
SR
= Pushbutton or contact for electrical circuit-breaker reset
Vaux
= Auxiliary power supply voltage (see note F)
W1
= Serial interface with control system (external bus): EIA RS485 interface (see note E)
W2
= Serial interface with the accessories of PR122/VF releases (internal bus)
X
= Delivery connector for auxiliary circuits of withdrawable version circuit-breaker
X1...X7
= Connectors for the accessories of the circuit-breaker
XF
= Delivery terminal box for the position contacts of the withdrawable circuit-breaker (located on the fixed part of the
circuit-breaker)
XK1
= Connector for power circuits of PR122/VF releases
XK2 - XK3 = Connectors for auxiliary circuits of PR122/VF releases
XK10 - XK12 = Connectors for power circuit of PR122/VF releases
XK4
= Connector to signal open/close
XO
= Connector for YO1
B2342
Model
Apparatus
Emax VF
1SDH000909R0001
Doc. No
Scale
Page No
57/66
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