Poznámky redaktora
Model L3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.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 made using digital microprocessor technology and interfaces with the user means graphic display and keyboard.
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.
30/1 08
. Circuit-breakers.
12.
Complete with instantaneous override protection that trips when the electronic release not powered.2 cifica tio s
12. 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
12.2.1 rd
The PR122/DC has been designed work accordance with the international standard:
IEC 60947-2 Low voltage apparatus.
The protection unit self-supplied primary voltages (PR120/V PR120/LV module).12.
The unit opens the circuit-breaker which installed means the TC, which takes effect directly the device's mechanical leverism
