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Operating status shown
The circuit diagram for the following conditions:
- withdrawable circuit-breaker, open and racked-in
- circuits de-energised
- releases not tripped
- motor operating mechanism with springs discharged... And PR123/DC release)
K51/SZout Zone selectivity: output for protection (only with Uaux.4 Contacts for electrical signalling circuit-breaker test isolated position (only with withdrawable circuit-
breakers)
SC Pushbuttonor contact for closing the circuit-breaker
SO Pushbuttonor contact for opening the circuit-breaker
501 Pushbuttonor contact for opening the circuit-breaker with delayed trip
502 Pushbuttonor contact for opening the circuit-breaker with instantaneous trip
SR Pushbuttonor contact for electrical circuit-breaker reset
ABB SACE 33
.. And PR123/DC release)
K51/YC Closing control from PR122/DC PR123/DC electronic release with communication module PR120/D-M
K51/YO Opening control from PR122/DC PR123/DC electronic release with communication module PR120/D-M
M Motor for charging the closing springs
Q Circuit-breaker
Q/1.5 Contacts for electrical signalling circuit-breaker racked-in position (only with withdrawable circuit-
breakers)
S75T/1. and PR123/DC release)
K51/GZout Zone selectivity: output for protection (only with Uaux. The
circuit-breaker may closed only after pressing the reset pushbutton, after energizing the coil for
electrical reset (if available)..8 Contacts the PR021/K signalling unit
K51/GZin Zone selectivity: input for protection (only with Uaux.4 Contacts for electrical signalling circuit-breaker racked-out position (only with withdrawable circuit-
breakers)
S75I/1.
Versions
Though the diagram shows circuit-breaker withdrawable version, can applied fixed version circuit-breaker
as well.Circuit diagrams
Reading information
Warning
Before installing the circuit-breaker, carefully read note the circuit diagrams.3 Limit contacts for spring-charging motor
S43 Switch for setting remote/local control
S51 Contact for electrical signalling circuit-breaker open due tripping the overcurrent release.27 Circuit-breaker auxiliary contacts
S33M/1...
S75E/1.
Fixed version
The control circuits are fitted between terminals (connector not supplied)..P4 Programmable electrical signalling (available only with Uaux and PR122/DC PR123/DC release with
indicator module PR120/K)
K51/SZin Zone selectivity: input for protection (only with Uaux..
With this version, the applications indicated figures and cannot provided..
Withdrawable version
The control circuits are fitted between the poles connector (terminal box not supplied)..
Version with PR122/DC electronic release
Version with PR123/DC electronic release
Caption
□ Circuit diagram figure number
* See note indicated letter
A1 Circuit-breaker accessories
A3 Accessories applied the fixed part the circuit-breaker (for withdrawable version only)
A4 Example switchgear and connections for control and signalling, outside the circuit-breaker
D Electronic time-delay device the undervoltage release, outside the circuit-breaker
F1 Delayed-trip fuse
K51 PR122/DC, PR123/DC electronic release with the following protection functions:
- overload protection with inverse long time-delay trip setting I1
- short-circuit protection with inverse definite short time-delay trip setting I2
- short-circuit protection with instantaneous time-delay trip setting I3
- earth fault protection with inverse short time-delay trip setting I4
K51/1.... and PR123/DC release)
K51/IN1 Digital programmable input (available only with Uaux and PR122/DC PR123/DC release with indicator
module PR120/K)
K51/P1
