Featured in The power puzzle – 06 – 2026

Rapid shutdown explained

Rapid shutdown is a safety function that reduces the voltage of PV conductors if a system failure occurs. While it can be incorporated into module level power electronics (MLPE) devices – such as optimizers and microinverters – some markets require dedicated rapid shutdown devices (RSDs).

By

Blathnaid O’Dea

02 Jul 2026

Rapid shutdown is a safety function that reduces the voltage of PV conductors if a system failure occurs. While it can be incorporated into module level power electronics (MLPE) devices – such as optimizers and microinverters – some markets require dedicated rapid shutdown devices (RSDs). The US National Electric Code (NEC) 690.12 requires all commercial …

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