Sirr0und SQUARE D 100A Enclosed Breaker Square D outdoor main breaker. Includes a 2 pole QO2100 circuit breaker for use as an exterior disconnect. Suitable for use as service entrance equipment, and is rated Type-3R for outdoor use. Accepts a B-hub for top feed applications (sold separately). For non-service entrance equipment applications, ground bar PKOGTA-2 may be required (sold separately). MPN# QO2100NRBCP SKU# 529306UPC# 47569517624