The AC3-X0-02-455-213-D is a hydraulic-magnetic circuit breaker from the A-Series product line designed for precise overcurrent protection in compact form factors. Based on the part number decoding, this unit is configured with a 5.5 A current rating (code 455) and screw terminal configuration (code 213). The A-Series breakers are rated up to 277 VAC at 50/60 Hz and 80 VDC with a maximum interrupting capacity of 7,500 amps, offering versatile protection for one to six pole configurations. The hydraulic-magnetic operating principle provides reliable trip performance across varying load conditions and environmental temperatures. These breakers are commonly deployed in marine, telecom, renewable energy, industrial automation, and commercial food equipment applications where compact design and dependable overcurrent protection are essential.