Frequently asked questions
Does the Resi9 SPD require an additional protection device (MCB)?
FAQ000264972
02 February 2024
We recommend using Resi9 MCB backup protection device for Resi9 SPD, 1P 40A MCB (R9F06140) for 1P SPD (R9L40100).Why a back up protection is necessary?
(1) Protect upstream fuse/breaker - cascading
(2) Ensure the power can be turned back on until the SPD is replaced in the event of SPD trip