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Emax
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Doc. no.
Model
Apparatus
Scale
Page No
1SDH000460R0002
12. SACE PR121/P RELAY
12.1. IDENTIFICATION
The PR121/P units available, in accordance with the IEC Standards, with the various default and optional protections and mod-
ules, are illustrated in the fi gure below:
12.2. Specifi cations
12.2.1. General characteristics
Relay PR121/P is an electronic unit for Emax CB. Its function is to monitor and protect against abnormal current.
The unit installed on the CB is connected to the current sensors for primary current reading and to the Trip Coil for circuit-breaker
opening control.
The sensors provide the primary current measurement and the energy for powering the relay, even in the absence of external
power supply.
Connected directly to an opening mechanism, the Trip Coil allows the CB to open. The control is transmitted to the Trip coil in
accordance with the protection settings.
Dip switches on the front allow the main protections and settings to be regulated, while the state of the relay is indicated by the
leds of the front interface.
Depending on the version, the protections available are as follows:t
Symbol
Protection against
L
overload with inverse long time delay
S
short-circuit with adjustable delay
I
nstantaneous short-circuit
G
earth fault with adjustable delay
The relay unit also provides a fi xed protection against instantaneous short-circuit at high current values, called linst protection.
A set of accessories adds optional functions to the basic version.
Temporary accessories:
- PR030/B powers the relay so as to display its state (by means of the LEDs) and allow the installation operations to be performed.
- BT030-USB for relay powering and communication, so as to allow different sorts of information to be supervised via a PC, such
as the Trip and measurements log fi le, and for regulating settings and functions that cannot be adjusted by means of the front
dip switches, such as the Thermal Memory.
- PR010/T allows the relay to be supplied, enables the protections to be tested and test reports to be saved.
- Ekip T&P, similarly to BT030-USB, can be used to power and communicate with the relay via a PC. It also allows units like
PR010/T to be tested, again via a PC.
Communication with ABB SACE devices is facilitated by the Ekip Connect SW supplied with BT030-USB and Ekip T&P modules,
or available from the Internet website.
Fixed accessories:
- The HMI030 panel interface expands the monitoring functions of the relay and displays the current measurements of all the
phases in real time.
- Flex Interface modules allow the alarm or state signals of the relay to be matched to programmable electromechanical contacts.
They also allow a complete network of several units to be created and can also be connected to external modules (e.g. HMI030).
Consult the following chapters or the dedicated manuals for details about each individual unit.
PR121/P
PR121/P
PR121/P
Values available
Temporary accessories (test connector)
BT030 USB
PR030/B
PR010/T
Ekip T&P
Fixed accessories (connector XK2)
HM030
Flex Interface
