L3447
Emax DC
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L3728
Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000635R0002
12. SACE PR122/DC Release - Identification
The PR122/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:
(1)
Standard: PR120/V or PR120/LV
(2)
Slot inside occupied by PR120/DC
12.1 Standard
The PR122/DC has been designed to work in accordance with the international standard:
IEC 60947-2 Low voltage apparatus. Circuit-breakers.
12.2 Specifications
12.2.1 General
The PR122/DC is a high-performance 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 complete the prealarm and alarm management for the protection and watchdog functions.
Complete with an instantaneous override protection that trips when the electronic release is not powered.
The protections available are:
Symbol
Protection against
L
overload with inverse long time delay
S
short-circuit with adjustable delay
I
instantaneous short-circuit
OT
temperature out of range
MCR
closing on short-circuit
The PR122/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 (PR120/V or PR120/LV module).
The unit is made using digital microprocessor technology and interfaces with the user by means of a graphic display and keyboard.
Protections
For all versions
PR120/V
(1)
- PR120/LV
(1)
X
-
PR120/D-M
-
X
PR120/K
-
X
PR120/DC
(2)
X
-
BT030
-
X
Modules available
standard
optional
PR122/DC
