I doubt if the 125 amp breaker will fit into a 100 amp box. This is due to the rating of the box only being rated at 100 amps. If this exchange could be made then the service conductors feeding the box must be upgraded to take the 125 amperage that the breaker will allow on the conductor.
Single phase, 3 wire, 22K A/C main breaker factory installed. Aluminum bus bar, tin plated. ANSI 61 gray powder coated.
Suitable for use as service equipment when main breaker is installed or when not more than six main disconnecting means are provided. Convertable from main breaker to main lug. NEMA Type 1.
19.996 width x 9.997 depth.
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