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13 SACE PR123/DC Release - Identification
The PR123/DC units available, in accordance with the IEC standards, together with the various protections and the various standard and optional
modules, are illustrated in the following figure:
Standard: PR120/V or PR120/LV
(1)
Slot inside occupied by PR120/DC
(2)
13.1
Standard
The PR123/DC has been designed to work in accordance with the international standard:
IEC 60947-2 Low voltage apparatus. Circuit-breakers.
13.2
Specifications
13.2.1 General
The PR123/DC is a 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 of 3- and 4-pole low-voltage air circuit-breakers. The unit's
user interface also enables parameter setup and completes the prealarm and alarm management for the protection and watchdog functions.
The protections available are:
Symbol
Protection against
L
overload with inverse long time delay
S, S2
short-circuit with adjustable delay
I
instantaneous short-circuit
G
earth fault with adjustable delay
U
current unbalance
O T
temperature out of range
UV
undervoltage
OV
overvoltage
RP
reverse active power
MCR
closing on short-circuit
The PR123/DC can be installed on 3-pole CBs or on 4-pole CBs.
The unit opens the circuit-breaker in which it is installed by means of the TC, which takes effect directly on the device's mechanical leverism.
The protection unit is self-supplied by primary voltages via the PR120/V-PR120/LV module.
The unit is made using digital microprocessor technology and interfaces with the user by means of a graphic display and keyboard.
L3447
Model
L3728
PR123/DC
Protections
For all versions
Modules available
PR120/V
- PR120/LV
(1)
(1)
PR120/D-M
PR120/K
PR120/DC
(2)
BT030
PR123/DC
2
standard
optional
X
-
-
X
-
X
X
-
-
X
Apparatus
Emax DC
Doc. No.
1SDH000635R0002
Scale
Page No.
49/108
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