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12.1 General
The PR122/DC 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 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.
The unit opens the circuit-breaker which installed means the TC, which takes effect directly the device's mechanical leverism.
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. SACE PR122/DC Release Identification
The PR122/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:
For all versions
Modules available standard optional
PR120/V111- PR120/LV111 -
PR120/D-M X
PR120/K X
PR120/DC(2) -
BT030 X
(1) Standard: PR120/V PR120/LV
(2) Slot inside occupied PR120/DC
12.
Model L3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.1 rd
The PR122/DC has been designed work accordance with the international standard:
IEC 60947-2 Low voltage apparatus.
Complete with instantaneous override protection that trips when the electronic release not powered.2.
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 range
MCR closing short-circuit
The PR122/DC can installed 3-pole CBs 4-pole CBs.12.2 cifica tio s
12.
The protection unit self-supplied primary voltages (PR120/V PR120/LV module).
The unit made using digital microprocessor technology and interfaces with the user means graphic display and keyboard. Circuit-breakers
