Mastervolt has gone above and beyond when it comes to safety with the MLI Ultra Relay and Fuse Connect Kit.
Each individual Lithium-Ion battery should have a safety relay and class-T fuse holder. 

Each individual Lithium-Ion battery should have a safety relay and class-T fuse holder. This neat bracket brings together all the required safety accessories in a simple and efficient way and removes the need for complex wiring and installations

The compact bracket can be easily fitted straight on top of the battery, which also saves space in installations where there isn’t much room.

A perfect fit for MLI Ultra 12/2750 and MLI Ultra 12/5500, more info can be found at www.mastervolt.com/products/li-ion/mli-ultra-relay-and-fuse-connect-kit/
Also available in 24 volt version.