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The Allen-Bradley 140U-D6D3-B20 is a robust molded case circuit breaker designed for high performance within the 140U MCB series. It operates at a rated current of 12 Amps, with a magnetic trip range of 15 to 20 Amps and a high interrupting capacity of 65 kA, meeting UL 489 standards for global application. Engineered with a 2 or 3-pole configuration and a rated insulation voltage of 690 Volts IEC, it supports backfeeding at 240 Volts and 480Y/277 Volts, while its design includes features like a padlock kit, terminal shields with IP 20 rating, and flexible wire modules. The units construction allows for mounting on a DIN Rail, with electrical and mechanical interconnections facilitated by AC or DC electronic coils, while maintaining alignment with extension shaft support and ensuring front mount auxiliary contact compliance through its load terminal cover.