Type 1+2+3 combined arrester with function indicator, for tool-free installation on the 40 mm busbar system with overcurrent-protected voltage tap (L and N) using a 25 kA B6A automatic circuit breaker for RfZ and APZ in accordance with the VDE-AR-N 4100 application rule. Application: Buildings without external lightning protection and to fulfil the requirements for overvoltage protection of the electrical system in accordance with DIN VDE 0100-443.