WAGO Electrical Interconnections for 221 and 2773 Series – WAGO 207-3304, The WAGOBOX® XL 207-3304 junction box is designed for use with the WAGO 221 and 2773 series connectors. WAGO Box; Branch; for multicore cables; XL; 221-41x, 2773 series; max. 4 mm² connectors; without splicing connectors; for BS 5733 – MF; greyThe WAGOBOX® XL junction box is rated 450V/4kV and can support conductor sizes from 0.14mm² to 4mm².The maximum number of supported individual conductor connections is 36. Each cable clamp can grip cables with an overall diameter between 3mm and 15mm. WAGO 207-3304 WAGOBOX XL Junction Box for 221-4 & 2773 Series Connectors