Molded Case Circuit Breakers

This category covers Allen-Bradley Bulletin 140MG motor protection circuit breakers (MCPs), stocking over 1,700 catalog numbers for controls engineers and panel builders specifying motor branch circuit protection. The 140MG series is available in multiple frame sizes — including G Frame (125A), H Frame (125A), and J Frame (250A) — with interrupting ratings of 35–65 kA at 480V as reflected across the in-stock selection. These molded case circuit breakers are commonly used in MCC buckets, standalone motor starters, and variable frequency drive input protection applications. Suffix codes in the catalog number indicate accessory configurations such as shunt trips, auxiliary contacts, and key operators, giving specifiers flexibility when matching exact bill-of-materials requirements. Search terms like "140MG motor circuit protector", "Allen-Bradley MCP breaker", and "140MG J frame 250A" point directly to this inventory.