Residual Current Device 40A, 4P Three-phase (3P+N), Type A double wave immunized (300mA)

The different types:

According to international standard IEC 60755, they are classified according to their ability to detect different residual current waveforms and are divided into type AC, A, F, B residual current devices.

Type AC residual current devices were the first to be commercialized and are especially used in residential systems. They detect alternating residual current at the mains frequency of 50/60 Hz and are suitable for linear loads.

Type A devices work better with sinusoidal alternating currents and sudden unidirectional currents and can replace type AC.

Type B residual current devices are ideal for use with direct or high-frequency currents and are suitable for use in the presence of non-linear circuits and in the installation of electric vehicle charging points.

Type F residual current circuit breakers, where F stands for Frequency, are an evolution of type A residual current protection devices and also work with multi-frequency current. They are designed for indirect contact protection of devices equipped with inverters.

Although type F residual current devices are the least used, professionals are starting to install them in both industrial and residential environments. Obviously, the choice to install a residual current device, even of type F, depends on several factors such as the type of electrical system, the need for protection, and regulations.

* Type F residual current devices: why are they so important?

Today, many household appliances and industrial machines, such as washing machines, vacuum cleaners, dishwashers, air conditioners, and heat pumps, are equipped with inverters: a technology that allows them to improve their performance by reducing energy consumption. Single-phase frequency converters, to regulate the number of revolutions of the drive, can produce mixed-type residual currents, with high-frequency components. Traditional type A and AC residual current devices may not be able to detect them correctly.

Type F residual current devices have been designed to meet the needs of single-phase inverter applications, as they ensure an adequate level of protection in case of earth fault. In addition, they offer high resistance to untimely tripping.

* Characteristics of type F residual current devices

These electrical protection devices, designed to ensure the safety of people and the protection of electrical systems, are capable of detecting sinusoidal pulsed alternating and direct currents. In addition, in accordance with IEC/EN 62423, they guarantee residual current protection against earth leakage with a composite frequency of up to 1 kHz. In the event of fault currents at the output terminals of single-phase frequency converters, these residual current devices detect them correctly.

Type F residual current devices also have good resistance to transient disturbances and overvoltages of atmospheric origin.

In terms of performance, they are between type A and type B residual current devices. It should be noted that only type B devices are capable of detecting faults with DC components.

* Why choose a type F residual current circuit breaker?

The adoption of a type F residual current circuit breaker proves to be the most suitable option in situations where reliable and versatile protection is required, capable of adapting to changing and complex operating conditions. Thanks to their distinctive features, they ensure:

advanced protection for appliances equipped with inverter technology; optimization of energy consumption; adaptability to different types of electrical loads.
In addition, they offer various advantages in the presence of single-phase inverters:

optimized protection in case of earth faults; reduction of false alarms or untimely tripping of the protection device; improved safety and reliability of both residential and industrial electrical systems.

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