Siemens SENTRON 3WA1 - Page 53

Description
2.3 Protection system
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
51
Overload alarm AL1 and AL2
The alarm function of the overload protection is divided into two levels.
• Alarm threshold AL1:
Alarm threshold AL1 can be set in the range from 40% to 100% of the overload
protection current setting I
r
using the SENTRON powerconfig configuration software.
When the alarm threshold AL1 is exceeded, the LED labeled "AL" lights up
permanently in yellow and a message is shown on the display of the electronic trip
unit.
• Alarm threshold AL2:
Alarm threshold AL2 cannot be set; it corresponds to the current setting I
r
of the
overload protection.
When the alarm threshold AL2 is exceeded, the LED labeled "AL" lights up
permanently in red and a message is shown on the display of the electronic trip unit.
Characteristic
The overload protection is available with the following tripping characteristics:
• I
2
t characteristic with dependent long-term delay
• I
4
t characteristic with dependent long-term delay for optimum selectivity for upstream
and downstream fuses