ABB | SACE Emax 2
Ekip Touch protection trip unit | 9 - Touch protections61 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
9 - Touch protections
Presentation
Touch protections are available in all models of trip units of the Ekip Touch range.
The presence of each single protection depends on the version of the trip unit, as specified in the following
paragraphs.
List of protections
Touch protections:
Symbol Protection against
L Overload with inverse long-time delay
S Selective short-circuit
I Instantaneous short-circuit
G Earth fault with adjustable delay
2I Programmable instantaneous short-circuit
MCR Instantaneous short-circuit on closing of the circuit-breaker
IU Current unbalance
Hardware Trip Circuit-breaker internal connection error
Harmonic Distortion Distorted waveforms
Current thresholds Programmable signal thresholds
T Temperature outside range
Neutral Neutral protection
The trip units of SACE Emax 2 series also guarantee a non-adjustable fixed protection against instantaneous
short-circuit at high currents, called Iinst.
Operating principle
The protections have a series of parameters available allowing the user to adjust the activation thresholds and
the opening times of the circuit-breaker.
The operating principle of all the protections is similar: if the current exceeds the set protection threshold, the
specific protection will enter the alarm condition and will begin to delay.
The duration of the delay depends on the threshold and time parameters set, and depending on the dynamic
of the current two behavoiurs are possible:
• If the alarm condition persists, the trip unit opens the circuit-breaker.
• If the current drops below the protection threshold, the trip unit exits from the alarm condition, interrupts
the delay and does not make the circuit-breaker open.
The protection thresholds refer to the rated current of the Rating Plug (In).
IMPORTANT:
• To manage the circuit-breaker tripping with a specific protection, the protection itself
must be enabled and, if supported, must have the Trip Enable parameter activated.
• All the protections have a default configuration: if enabled, check the parameters and
make the necessary changes according to the requirements of your installation.
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