Universal circuit breakers used to be called frame breakers and universal circuit breaker manufacturers usually have a steel frame. All components are mounted in the frame. The main components are exposed and there is no housing. The large capacity allows for a wide range of functional decouplers and more auxiliary contacts. Different combinations of decoupling units result in different protection characteristics, so that universal circuit breakers can be used as distribution circuit breakers and as circuit breakers for motor protection.

When used for AC circuits, circuit breakers for power distribution generally have a capacity of 200 - 4000 A; their protection characteristics are divided into selective and non-selective types. Selective protection has two levels of protection characteristics: instantaneous action and short delayed action; three stages of protection with instantaneous action, short delayed action and long delayed action. They are generally used for main switches in power supplies and switches near the power end of branch circuits. Non-selective protection is limited to the current and general types, which can be delayed-action and instantaneous-action. They are usually used for switches near the mains and branch side of the power supply. When used for DC circuits, circuit breakers for power distribution generally have a capacity of 600 - 6000 A; fast and general types are available. For fast circuit breakers, they can be used to protect silicon rectifier equipment; for general purpose circuit breakers, they can be used to protect general DC equipment.

Circuit breakers for motor protection are generally used for AC 60 - 600 A and can start AC motors directly or indirectly. For the protection of squirrel-cage asynchronous motors with direct start. Protection of indirectly started squirrel-cage and wound-rotor induction motors.

General purpose circuit breakers of 600A capacity and below are generally driven by electromagnetic operating mechanisms; those of 1000A capacity and above are generally driven by motor mechanisms. In order to break and close the circuit breaker in case of maintenance or failure of the drive mechanism, the circuit breaker is equipped with an operating handle.

For circuit breakers with high limit breaking capacity, energy storage operating mechanisms are also used to increase the breaking speed.

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