CA1-B0-34-620-121-D is a single-pole hydraulic-magnetic circuit breaker from the Carling Technologies C-Series, designed for high amperage and voltage protection applications. This breaker features a series trip circuit configuration with a 20A current rating and operates at 50/60Hz with a medium delay characteristic. It is equipped with 1/4-20 threaded stud terminals and a white actuator with black legend. The C-Series employs a unique arc chute design allowing for higher interrupting capacities up to 10,000 amps. Typical applications include marine, datacom/telecom, renewable energy, industrial automation, and medical equipment where reliable circuit protection is essential.