The Eaton BR40SPAST is a 2-pole, 40 Amp GFCI spa panel designed for residential and light commercial applications. This NEMA 3R enclosure provides robust protection and features a ground fault self-test function for enhanced safety. It comes factory installed with a GFCB240 breaker and is suitable for wire sizes #8-2 AWG Cu/Al..This Eaton BR spa panel (BR40SPAST) is a two-pole, 40 Amp GFCI breaker housed in a NEMA 3R enclosure. It supports wire sizes from #8 to #2 AWG Cu/Al and operates with a 120/240V AC voltage rating. The panel includes a factory-installed GFCB240 breaker with a ground fault self-test feature. Its dimensions are 10.9 inches in length, 4.4 inches in height, and 4.9 inches in width, with a weight of 4.9 lb. It complies with NEC 680.40-680.43 and is UL Listed.Box size: 5R | Br Gfi Brkr: BR Series Ground Fault Circuit Interrupter Breaker. | Fact Install: Indicates this unit comes with Factory Installation or is pre-configured at the factory. | GFCI Sensitivity: Typically 5mA or 6mA trip level for personnel protection. | Spa Pnl: Likely refers to Special Panel or a specific factory configuration.