ABB R2000PR121 is a low voltage air circuit breaker equipped with electronic release unit. It is designed for large current power distribution circuits, providing reliable circuit protection and switching functions. This device features stable breaking performance and integrated protection modules, and operates safely in various industrial and commercial power distribution environments.

R2000 represents the frame rated current of 2000 amperes. PR121 refers to the model of the built-in electronic trip unit. The complete model code is used for product identification, ordering and inventory management.

The rated working current of this circuit breaker is 2000 amperes. It is applicable to alternating current power supply with common industrial voltage levels and frequency. It has high rated short-circuit breaking capacity to cope with sudden circuit faults. It supports three-pole or four-pole structure and multiple installation and wiring modes. The mechanical service life and electrical service life meet industrial application standards. The overall protection grade is IP20. It works normally within the temperature range from minus 5 degrees Celsius to 40 degrees Celsius, and adapts to relative humidity below 95 percent without condensation.

It is equipped with standard auxiliary contact terminals for signal output. The basic PR121 trip unit has no built-in communication function. It is fitted with local indicator lights and physical buttons for status display, testing and reset operation. All wiring terminals adopt standard structural design for stable circuit connection.

It provides overload protection with adjustable action parameters to prevent equipment damage caused by long-term overcurrent. It delivers instantaneous short circuit protection to cut off faulty circuits rapidly when short circuit occurs. It undertakes normal circuit switching and electrical isolation tasks for power distribution loops. It displays real-time operating status through indicator lights and supports local manual testing and reset.

It is mainly used for main incoming circuits and bus coupler circuits in industrial and commercial low voltage power distribution systems. It applies to protection and control of large capacity transformers and heavy load motor loops. It is widely deployed in power distribution rooms of factories, buildings and public facilities.

Install the breaker inside the power distribution cabinet according to the selected installation mode, and fasten all connecting wires with standard torque. Check the operating status and indicator lights regularly during daily use. Keep the device interior clean and remove accumulated dust periodically. Inspect wiring terminals and contact conditions to avoid loose connection and abnormal heating. The electronic trip unit requires no regular maintenance. Cut off the upper power supply completely before inspection or maintenance work. Replace damaged parts or the whole device when abnormal operation occurs.