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Circuit-breakers.
The unit made using digital microprocessor technology and interfaces with the user means graphicdisplay andkeyboard.2 cifica tio s
13.
13.
The protections available are:
Symbol Protection against
L overload with inverse long time delay
S, short-circuit with adjustable delay
I instantaneous short-circuit
G earth fault with adjustable delay
U phase current unbalance
OT temperature out range
UV undervoltage
OV overvoltage
RP reverse active power
MCR closing short-circuit
The PR123/DC can installed 3-pole CBs 4-pole CBs.SACE PR123/DC Release Identification
The PR123/DC units available, accordance with the IEC standards, together with the various protections and the various standard and optional
modules, are illustrated the following figure:
Modules available standard optional
PR120/V(1) PR120/LV(1) -
PR120/D-M X
PR120/K X
PR120/DC(2) -
BT030 X
(1) Standard: PR120/V PR120/LV
(2) Slot inside occupied PR120/DC
13.
The unit opens the circuit-breaker which installed means the TC, which takes effect directly the device'smechanical leverism.
Model 3447
Apparatus Emax DC
Scale
D 1SDH000635R0002
Page No.1 rd
The PR123/DC has been designed work accordance with the international standard:
IEC 60947-2 Low voltage apparatus.
The protection unit self-supplied primary voltages via the PR120/V-PR120/LV module.1 General
The PR123/DC high-performance self-supplied protection unit with Protection, Measurement, Data storage, Communication (optional),
Self-test, Load control and Zone selectivity functions for the ABB SACE 'Emax' range and 4-pole low-voltage air circuit-breakers.2. The unit's
user interface also enables parameter setup and completes the prealarm and alarm management for the protection and watchdog functions.
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