FAQ:Does the NCE Smart Booster 5 amp SB5 have short circuit protection?

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The SB5 lacks short circuit protection. It is advised to use an NCE or third-party circuit protection device with the SB5 to avoid damaging it should a short occur.

The included P514 power supply does have some protection for a short, but it will cycle on again after a few seconds. Allowing a short to persist more than a few minutes risks damaging the booster. The status LED on the booster will flash each time an attempt is made to restore power. When steadily lit, power has been restored to the track.

Source
Page 2 of the SB5 manual.