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In order to protect the UPS's bypass contactor and also the main input of the UPS, for all scenarios
including short circuit, the following recommendations apply:
•
The circuit breaker that feeds the bypass input line and the circuit breaker feeding the main input of
UPS shall have no magnetic protection delay, or a maximum magnetic protection delay of 50
msec. This ensures that the circuit breaker will interrupt the short circuit before any damage can be
done to the static switch contactor and the UPS modules.
•
If you choose to use a time-delay circuit breaker on the bypass input line, recommended
rating of the breaker is approximately six times the maximum bypass input current.
•
When using a circuit breaker with delayed magnetic protection, the ability of the cables and the rest
of the infrastructure to withstand a short circuit must be taken in account.
Where the local electrical code is more stringent than the above recommendations, the local or
national codes must be followed.
MegaV2 250 Installation Guide, Release 2.2
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