Specifications

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Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
L5439
14. SACE PR123/P Release - Identification
The PR123/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:
Protections
Optional modules available
For all versions
PR120/D-M - COM
PR120/K - SIGNALLING
PR120/D-BT - WL-COM
BT030 USB
Rc
(1)
2
PR123/P PR123/P
Note (1): see par. 16.5
14.1. Standard
The PR123/P has been designed to work in accordance with the international standard:
IEC 60947-2 Low voltage apparatus. Circuit-breakers
14.2. Specifications
14.2.1. General
The PR123/P is a high-performance self-supplied protection unit with 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
D directional short-circuit with adjustable delay
I instantaneous short-circuit
G earth fault with adjustable delay
U phase current unbalance
OT temperature out of range
UV undervoltage
OV overvoltage
RV residual voltage
RP reverse active power
UF underfrequency
OF overfrequency
MCR closing on short-circuit
The PR123/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 PR123/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 400A Rating Plug has an Iu of 800A and an In of 400A.
The unit opens the circuit-breaker in which it is installed by means of the TC, which takes effect directly on the device’s mechani-
cal leverism.
The protection unit is self-supplied by current sensors and primary voltages via the PR120/V module.
The unit is made using digital microprocessor technology and interfaces with the user by means of a graphic display and keyboard.