MidNite Solar MNBIGBABY Big Baby Box Enclosure. The original Baby Box has been a huge success in filling an industry need. We have created an enclosure called the Big Baby to over come the Baby Box smallness allowing for a ETL listed 4 position din rail box. This box is about twice as wide as the baby box giving you more wiring room. It also includes a ground box lug and mounting provisions for our short insulated bus bar as well as a ground bus bar. A dimensional drawing is under Attachments below. General use powder coated aluminum enclosure - holds up to four 13mm wide din rail breakers from 1 - 63 amps.