ABB SACE Emax 2 Series Operating Instructions Manual page 31
Low voltage air circuit-breaker
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Additional protections The Ekip T&P module, and the Ekip Connect software, allow you to set some protections not available via
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dip-switch:
• Thermal Memory
• T Protection
• Prealarm threshold
• Hardware Trip
Thermal Memory
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 100ms)
T Protection
T protection protects the circuit-breaker against abnormal temperatures recorded by the protection trip
unit.
T protection is always active; via Ekip Connect it is possible to enable tripping, which takes place for
temperatures t < -40 °C or t > 85 °C.
Pre-alarm
The purpose of the pre-alarm, available for L and G protections, is to signal that the measured current is
near the activation threshold of the protection itself.
It is possible to set the pre-alarm threshold in order to establish the pre-alarm activation values; the pre-
alarm threshold is expressed as a percentage in relation to the protection thresholds (I1 and I4) and is
adjustable between 50% and 90% (default value).
Example: with I1 = 0.6 In and pre-alarm threshold L=50 %, the pre-alarm is activated for currents greater
than 0.3 In
The pre-alarm condition is activated for currents higher than the threshold set, and is deactivated for:
• Current less than the pre-alarm threshold.
• Current greater than the activation threshold of protection.
Hardware Trip
If enabled, the protection activates if one or more disconnections of the current sensors, Rating plug, Trip
coil or an alarm inside the unit are detected.
The protection activates with a TRIP if the disconnections persist for more than one second; in the case
of Trip coil disconnection, the unit merely handles alarm signaling.
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The purpose of this protection is to maintain the integrity of the circuit-breaker and installation in the
case of particularly high current values requiring shorter reaction times than those provided by the
instantaneous short-circuit-protection.
The protection cannot be disabled, the tripping threshold and time are defined by ABB.
ABB | SACE Emax 2
Ekip Dip
2 - Protections - Introduction
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