General
Nominal voltage	520/300 VAC
Frequency range	48 to 63 Hz
Nominal current	30 A
Leakage current	<0,4 mA
Degree of protection	IP20
Construction	Metal housing
Mounting	mounting brackets with holes
Climate category	25/085/21
Approvals	CE, UL
Standards	EN 60939, UL 1283, CSA 22.2 No. 8, RoHS

The EPA NF-K-4-30 is a three-phase high-performance EMI power filter designed for use in systems with high electromagnetic compatibility requirements. The device features a book form, enabling compact mounting, and is equipped with a neutral conductor. It is rated for a nominal current of 30 A and operates in the voltage range of 400 to 520 V AC at frequencies of 50/60 Hz. The two-stage filtering technology ensures very high attenuation of disturbances in the network, thereby improving the quality of power supply for sensitive electronic devices. The device is UL-tested and complies with standards EN 60939, UL 1283, and CSA 22.2 No. 8, confirming its reliability and safety in industrial and commercial applications.

Applications

The NF-K-4-30 is suitable for systems requiring high EMI compatibility, such as in automation technology, manufacturing industry, or for supplying IT infrastructures. The book form allows space-saving installation in enclosures, with the small footprint minimizing space requirements. The operating temperature ranges from −25 °C to +85 °C, enabling use in various environments, including industrial systems with high thermal loads.

Functions and Equipment in Detail

The power filter is constructed in two stages to ensure effective attenuation of disturbances in the frequency range of 48 to 63 Hz. The integrated choke technology reduces high-frequency disturbances generated by electronic loads such as frequency converters or switch-mode power supplies. The leakage current is below 0.4 mA, ensuring low load on the earthing system and high operational safety. The leakage current is 2.9 mA, which is within the limits of applicable standards. The device includes a neutral conductor, ensuring complete filtering of phases and the neutral conductor.

Technology Explained Simply

The book form of the filter allows vertical mounting in enclosures, optimizing space utilization within the cabinet. The metal housing provides mechanical stability and acts as an electromagnetic shield. Mounting is achieved via brackets with holes, enabling secure attachment to enclosure walls or mounting plates. The protection rating IP20 protects against contact with fingers and against ingress of solid foreign objects larger than 12.5 mm, but is not suitable for outdoor use or in damp environments. The climate category 25/085/21 defines the operating temperature from −25 °C to +85 °C and the storage temperature up to +85 °C, with the maximum ambient temperature being 50 °C, at which the nominal current of 30 A is guaranteed.

Compatibility and Accessories

The NF-K-4-30 is designed for use in three-phase networks with a neutral conductor and is compatible with systems operating in the voltage range of 400 to 520 V AC. Standards EN 60939, UL 1283, and CSA 22.2 No. 8 ensure compliance with international safety and performance standards. The device is certified with CE and UL approvals, enabling use in Europe and the USA. RoHS compliance confirms the use of environmentally compatible materials.

Mounting and Installation

Mounting is performed using the integrated mounting brackets, which are inserted into the designated holes in the enclosure. The book form requires vertical orientation, with dimensions of 310 mm length, 70 mm width, and 172 mm height to be considered. Electrical connections are made via the designated terminal clamps for the three phases and the neutral conductor. Installation should be carried out in accordance with applicable regulations and local electrical installation safety requirements.

Advantages in Operation

The NF-K-4-30 provides high disturbance attenuation, increasing the operational safety of sensitive electronic devices. The low leakage current reduces the load on the earthing system and minimizes the risk of network disturbances. The book form and compact design enable efficient space utilization in enclosures. UL testing and compliance with international standards ensure high reliability and safety in continuous operation. The operating temperature up to +85 °C makes the device suitable for demanding industrial environments.