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NFIF

Product catalog summary

Overview: The document provides detailed information about ISKRA NFIF Type F Residual Current Circuit Breakers (RCCB). These breakers are designed to trip for residual currents with mixed frequencies, particularly from single-phase electrical loads with frequency inverters. They are suitable for use with appliances like washing machines, vacuum cleaners, and lighting systems.

Specifications: Type F RCCBs can detect mixed frequencies up to 1 kHz and are not affected by smooth d.c. residual currents up to 10 mA. They function independently of line voltage and are available in versions with short-time delay tripping (NFI2F, NFI4F) and selective type (NFI2FS, NFI4FS). The devices have a surge current withstand capability of up to 3 kA and an optional operating position. The degree of protection is IP20, which increases to IP40 when installed in a distribution box.

Types and Features: The document also describes other types of RCCBs:

Type AC: Sensitive to residual sinusoidal alternating currents.
Type A: Sensitive to both sinusoidal alternating currents and pulsating direct currents.
Type S: Features delayed break for selectivity and high resistance to surge currents, with rated currents from 25 to 100 A and residual currents of 100, 300, and 500 mA.
Type G: Offers short-time delayed breaking with resistance to unwanted tripping, rated currents from 25 to 100 A, and residual currents of 30, 100, 300, and 500 mA.

All types are VDE approved.

Technical Data: The RCCBs comply with IEC/EN 61008 and IEC/EN 62423 standards. They are available in two-pole and four-pole configurations with rated voltages of 230 V and 400 V, respectively. The rated impulse voltage is 4 kV, and the rated frequency is 50 Hz (60 Hz available on request). Rated currents range from 25 to 100 A, and rated residual operating currents are 30, 100, 300, and 500 mA. Maximum break times and minimum non-operating times are specified for different versions.

Environmental Conditions: The RCCBs operate in ambient temperatures from -25°C to +40°C and can be stored at temperatures from -35°C to +60°C. They have a terminal capacity of 1 to 35 mm² and a tightening torque of 2.0 Nm.

Ordering Information: The document provides ordering data for different types and configurations of RCCBs, specifying rated residual operating currents and rated currents.

Additional Information: The document includes dimensional drawings and schematics for two-pole and four-pole configurations.

Catalog excerpts

Residual Current Circuit Breakers

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Residual Current Circuit Breakers Type F - NFIF Features ISKRA NFIF are type F residual current circuit breakers (RCCB) for which tripping is ensured as for type A and in addition for residual currents with mixed frequencies that can result from single-phase electrical loads with frequency inverters. Intended for protection when using washing machines, vacuum cleaners, dishwashers, heating pumps, lighting systems … . Capable of detecting mixed frequencies up to 1 kHz The tripping characteristic of type F is not influenced by smooth d.c. residual currents up to 10 mA. Functions of detection, evaluation...

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Residual Current Circuit Breakers Note: Rated frequency 60 Hz on request. Ordering data Rated residual operating current IDn (A) Rated current In (A) Type

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Dimensional drawings Iskra, d.d. Stegne 21 SI-IOOO Ljubljana, Slovenia

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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