Bulletin 140MG MCCB

The Allen-Bradley Bulletin 140MG is a motor protection circuit breaker (MCCB) family designed to provide motor branch-circuit protection with adjustable magnetic-only trip settings, making these devices suitable for motor control centers, standalone starters, and combination motor controllers. The catalog number structure follows a logical pattern: the frame size is encoded in the first letter after the bulletin prefix (G = 125 A G-frame, H = 125 A H-frame, J = 250 A J-frame), the 8 denotes the voltage/interrupting series, the next character (P or E) indicates the trip mechanism variant, the following alphanumeric code (e.g., B70, C50, D10) represents the adjustable current-trip range, and the suffix characters identify accessories or terminal configurations such as shunt trips (SD), auxiliary contacts (AJ, AA, BA), or mechanical interlocks (MT, KA). All in-stock models carry a 35–65 kA interrupting rating at 480 V. Popular variants include the 140MG-G8P-C50-KA-MT (G-frame, 125 A), the 140MG-H8E-D10-AJ (H-frame, 125 A), and the 140MG-J8E-D15-SD-KA (J-frame, 250 A with shunt trip). With 108 catalog numbers available, buyers can configure the precise frame, trip range, and accessory combination required for their application.