The AD1-B0-34-620-4B1-C is an A-Series hydraulic-magnetic circuit breaker designed for precise overcurrent protection in compact form. This three-pole unit features a series trip current coil configuration with a 20-amp current rating and operates at maximum voltage ratings of 277VAC (50/60 Hz) and 80VDC, with a maximum interrupting capacity of 7,500 amps. The breaker is equipped with a handle actuator and sealed toggle mechanism, making it suitable for both general-purpose and full-load applications in harsh environments. It carries multiple certifications including UL 1077 recognition, UL 508 industrial control listing, CSA component supplementary protector certification, and TUV/VDE certification to EN60934. Common applications include marine systems, telecommunications, renewable energy installations, generators, welders, military equipment, industrial automation, and commercial food service equipment.