BT BM100 275 RM/3+N 806363 1. Three-phase surge protection for TT/TN-S system. 2. High discharge capacity, quick response. 3. Double thermal disconnection devices, provide more reliable protection. 4. Multifunctional connection for conductors and red copper busbars. 5. Windows will change to red when fault occurs, also provide remote alarm terminal at the same time. 6.Mode of protection：L-N/N-PE.