The MPPT WireBox provides an extra level of safety, and is particularly useful if your MPPT Solar Charger is installed in a general access area. It covers all DC terminals, preventing accidental or inquisitive contact with terminal screws.
There are various sizes available:
MPPT WireBox-L MC4 150-45/60/70 & 250-60/70
MPPT WireBox-XL MC4 150-85/100 & 250-85/100