BTicino prewired string boxes are the ideal solution for the protection and connection of systems up to 600 V d.c. The distribution boards have MC4 connectors to guarantee the maximum in terms of connection rapidity and safety, made with Class II installation. They have protection device and connections. The range includes pre-wired boxes for 2, 3 and 4 strings. The string boxes comply with the IEC 61439-1 standard.