SMA 20000TL Service Manual - Manual (Page 33)

5. Plug the new surge arresters into the designated
slots until they lock into place with the locking
tabs. The inspection window on each surge
arrester must face to the right.
6. Ensure that each surge arrester is securely inserted into its slot.
7. Tighten all four screws on the DC protective
cover with an Allen key (AF 3) in the sequence 1
to 4 (torque: 3 Nm ± 0.3 Nm).
10 Replacing the Surge Arrester SMA Solar Technology AG
Service Manual for Installers 33 STP20-25TL-SG-en-11