WAGO Electrical Interconnections for 221 and 2773 Series – WAGO 207-3301, The WAGOBOX® 207-3301 junction box is designed for use with the WAGO 221 and 2773 series connectors. WAGO Box; Branch; for multicore cables; 221-4; 221-41x, 2773 series; max. 4 mm² connectors; without splicing connectors; for BS 5733 – MF; greyThe WAGOBOX® junction box is rated 400V/4kV and can support conductor sizes from 0.2mm² to 4mm².The maximum number of supported individual conductor connections is 20. Each cable clamp can grip cables with an overall diameter between 3mm and 8mm. WAGO 207-3301 WAGOBOX 221-4 Junction Box for 221-4 & 2773 Series Connectors