Protection Release Pr331/P; Overview; Main Specifications; Protections - ABB Tmax T7 Operating Instructions Manual

2.

PROTECTION RELEASE PR331/P

2.1. Overview

PR331/P is available in 3 versions, all compatible with various different switchgear and testing accessories:
Values
available

2.2. Main specifications

PR331/P is an electronic device for SACE Emax X1 and SACE Tmax T7-T8 circuit-breakers with functions for monitoring and for
protecting against abnormal currents.
The protection release installed on the circuit-breaker is connected to the current sensors for primary current reading, and to the
Trip Coil for the circuit-breaker opening command.
The sensors provide the primary current measurement and energy for powering the protection release 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 adjusted, while the state of the protection release is indi-
cated by the leds of the front interface.
2.2.1.

Protections

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 protection release allows the protection MCR (available with the SACE Emax X1 CB) settings to be entered via Ekip Connect
and also ensures that fixed protection against sudden short-circuits at high current values (called Iinst protection) is provided.
2.2.2.

Functions

PR331/P includes various different functions, depending on the version and configuration chosen:
- Runtime measurement of the phase current and peak factor;
- Autotest: continuous monitoring of the main connections to the release, among which: current sensors, trip coil, rating plug,
circuit-breaker state.
- External contact (S51/P1) configurable by the customer, for monitoring one or more state or alarm events.
- Maintenance information and counters: events log, number of operations, estimated contact wear, maintenance log (via Ekip
Connect).
B0431
Model
PR331/P PR331/P
L I L
In=1600A
Temporary accessories (test connector)
BT030-USB
PR030/B
PR010/T
Ekip T&P
B1751
PR331/P
S I L S I G
Switchgear accessories
HMI030
Flex Interface
Apparatus
Doc. No
Emax X1-Tmax T7-Tmax T8
1SDH000587R0002
Scale
Page No
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