Siemens Low Voltage Panelboard Mount G-Frame Circuit Breaker with Thermal – Magnetic Trip Unit. UL LISTED NGB Frame with Standard Breaking Capacity. 40A 3-Pole (14KAIC at 600Y/347V) (25KAIC at 480Y/277V). Special Features: Load Side Lugs Only (TC1GG20) Wire Range: 8 – 1/0 AWS (CU/AL). Dimensions (W x H x D) IN: 3 x 5.4 x 2.8.