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The Allen-Bradley 140G-JTF3-D15 is a robust, thermal-magnetic circuit breaker from the 140 series, designed within the J frame branch and equipped with a trip unit for precise detection and interruption of abnormal currents. Featuring three poles, it supports a frequency range of 50 to 60 Hz and a voltage range of 220 to 500 VAC, making it versatile for applications as a panel, unit, or system circuit breaker. With dimensions of 160 x 105 x 140 millimeters, this breaker is complemented by a variety of accessories to enhance its performance, although it maintains optimum efficiency within moderate temperature ranges.