L2234
Emax
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Model
Scale
Page No.
Doc. No.
Apparatus
1SDH000460R0002
L2778
13. SACE PR122/P Release - Identification
The PR122/P 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:
Note (1): See par. 16.6
13.1 Standard
The PR122/P 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 PR122/P 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 complete 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 short-circuit with adjustable delay
I instantaneous short-circuit
G earth fault with adjustable delay
U phase unbalance
OT temperature out of range
MCR closing on short-circuit
The PR122/P can be installed on 3-pole CBs with and without an external neutral, or on 4-pole CBs.
It should be noted that the reference current for the PR122/P is the In (the rated current defined by the front Rating Plug) and not the Iu (the
uninterrupted rated current of the CB itself). Example: the CB E1B800 with a 400 A Rating Plug has an Iu of 800 A and an In of 400 A.
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 current sensors and primary voltages if the PR120/V module is installed.
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 - MEASURING
PR120/D-M - COM
PR120/K - SIGNALLING
PR120/D-BT - WL-COM
Optional modules available
PR122/P
PR122/P
PR122/P
PR122/P
BT030
Rc
(1)
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