1B3.5UM Circuit Protection

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1B3.5UM application field and working principle

1B3.5UM belongs to circuit breakers, which are devices used to automatically interrupt electric current in a circuit when the current exceeds its safe operating level. 1B3.5UM circuit breaker adopts the latest 1+N technology and is mainly used in low voltage power distributions with a rated voltage not exceeding 690V AC and below. In addition, it can be used as a motor protection switch, a power switch and a manually or automatically operated switch in semi-enclosed and shielded insulated switch cabinets.

The 1B3.5UM circuit breaker is composed of a vacuum interrupter, a contact switch, an insulation arc extinguishing part, and a movable arc extinguishing part with different specifications. The vacuum interrupter consists of a fixed contact and a movable contact. The contact switch is composed of a fixed contact switch and a movable contact switch, and the mechanical action force is provided by a drive mechanism. The two functions of closing and breaking the fixed contacts are combined when the circuit breaker is closed, which can realize one operation. The insulation arc extinguishing part consists of fixed and movable contacts, which is located between the fixed contact switch and the vacuum interrupter, and its function is to extinguish the arc in the vacuum interrupter. The movable arc extinguishing part is composed of a metal shutter. When the circuit breaker is opened, the metal shutter blocks the arc moving path, and the arc current is extinguished quickly.

The 1B3.5UM circuit breaker is mainly used for over-current protection, short-circuit protection, phase-to-phase or phase-to-ground fault protection. The instant over-current protection in the 1B3.5UM circuit breaker is mainly realized by the thermal effect and the small current of the instant releasing mechanism. The small current releasing mechanism can realize release when the instantaneous current is slightly higher than the rated current, and the thermal effect can reflect the total heat of the circuit current in a short time. When the thermal effect value exceeds the specified value, the Instant Release Action is triggered, and the 1B3.5UM circuit breaker trips according to the designed layout.

In addition, the 1B3.5UM circuit breaker can also be used to detect and protect against leakage current. The operation of the 1B3.5UM circuit breaker is also relatively flexible. It can be divided into manual operation, automatic type, remote type, and energy storage type; and different working conditions can be set Flexible, different currents can be set according to different working conditions, such as start tripping current, running tripping current, and no-load current trip.Under various working conditions, the circuit breaker will automatically respond to ensure the safety of the system.

In summary, the 1B3.5UM circuit breaker adopts the latest 1+N technology, has the characteristics of small size, light weight, long service life, and low maintenance cost, and has multiple functions of over-current protection, short-circuit protection and leakage protection. User-friendly design and relatively flexible operation make it widely applied in low-voltage power distribution systems.

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