AEG Protect C.1000 Operating Instructions Manual page 30

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Never connect additional loads to the UPS or switch on during a power
failure, e.g. if the UPS is operating in emergency mode!
As a rule, if there has never been an overload during normal operation,
Battery mode operation will also not have suffered an overload.
A flash of the LED fault in connection with a beep indicates a
deactivating fault. Follow the instructions in section 9.1.!
Finally, check the tightness of the emergency shut-off plug mounted
jumper wire and tighten the two outer screws of the contact securely
(see also page 24, item. 6).
If you would like to use the emergency shutdown function, refer first to
chapter 8.4 on page 48.
The built-in emergency shutdown voltage is only for UPS shutdown. This
is done electronically and does not correspond to an EMERGENCY
STOP device in accordance with DIN EN ISO 13850.