![](/images/new-backgrounds/1174544/17454483x1.webp)
Switch Hardware
3.2.4.3.1Power Supply LEDs
There are four LEDs on the front panel of the model B
Table 3.6 -
3.2.4.3.2Shutdown Conditions
To avoid damaging itself or the switch, the model B
Input undervoltage The AC line voltage is below 87 ±5VAC RMS.
Output undervoltage Output 1 is 42 ±2 VDC or Output 2 is below 4.5
±0.25 VDC. Shutdown from undervoltage is defeated during
Output overvoltage The voltage at Output 1 or Output 2 is above 125% ±8% of the nominal voltage.
Overtemperature Any power semiconductor has reached 90% of its maximum junction temperature.
NOTE: The