Page 69 - MCCB-XT2-XT4

ABB | SACE Tmax XT

10 - Additional protections and functions

Introduction Some protections have additional functions which extend their characteristics and performance:
Name Type of protection Page
Thermal Memory overheating of the cables 67
management of trip commands in a network of
Zone selectivity 67
circuit-breakers
blocking of protection on the basis of programmable
Blocks 70
events
Startup different thresholds on the basis of monitoring thresholds 70
Current thresholds Current control with programmable thresholds 71
Programmable Programmable commands with trip unit events or 72
Commands statuses

The presence of Ekip Synchrocheck allows the protections of the module to be activated (page 72)

Thermal Memory Protection The function, which is available for L and S protections, allows overheating in the cables connected to
the circuit-breaker to be prevented: in the case of trips within brief intervals, the unit considers the time
between commands and the entity of the faults so as to reduce opening time.
IMPORTANT: for the S protection the function can be activated if the selected curve is
time-dependent.

NOTE: the function also reduces the trip time in the case of overloads which have not
led to the open command (longer than 100 ms)

S, S2, I, 2I, MCR, G zone The function, which can be activated for S, S2, I, 2I, MCR and G protections (if available and enabled),
selectivity Protection allows several devices belonging to the same installation (including Ekip Touch) to be interconnected,
so as to handle trip commands in the best possible way in the case of S, S2, I, 2I, MCR and G protections.
The function allows the devices to be coordinated so that, if a fault occurs:
• the device nearest to the fault trips
• the other devices are blocked for a programmable time
NOTE: connection can be made between ABB devices that have the zone selectivity function

Characteristics
Ekip Touch has five selectivity connections, located on the rear connectors of the CB:
Name Type Description Connection
S, S2, I, 2I and MCR protection selecitivity From devices on the load
Szi Input
input side
S, S2, I, 2I and MCR protection selecitivity To devices on the supply
Szo Output
output side
From devices on the load
Gzi Input G protection selectivity input
side
To devices on the supply
Gzo Output G protection selectivity output
side
Common connection of selectivity The entire selectivity
Szc Common
network network

Continued on the next page

67 | © 2022 ABB | 1SDH002031A1002 - ECN000212994 Protections | 10 - Additional protections and functions