Specifications

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L5439

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:

Protections

For all versions

PR120/V - MEASURING

PR120/D-M - COM

PR120/K - SIGNALLING

PR120/D-BT - WL-COM

BT030 USB

(1)

Optional modules available

PR122/P

Note (1): See par. 16.5

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 mechani-

cal leverism.

The protection unit is self-supplied by current sensors and primary voltages if the PR120/V module is installed.