FN2090B-3-06

Overview

The Schaffner FN2090B-3-06 is a single-phase EMI/RFI line filter designed for chassis mounting. It operates at a rated voltage of 250V AC/DC and supports a maximum current of 3A within a frequency range of 0Hz to 400Hz. The component features two-stage attenuation with quick-connect terminals. Key electrical parameters include an inductance of 14mH, capacitance of 330nF, and a bleeder resistor of 470kΩ. It exhibits a low leakage current of 0.002mA. The unit functions reliably between -25°C and 100°C, with physical dimensions of 85mm length, 54mm depth, and 30.3mm height.

Feature Summary

• Two-stage circuit configuration provides enhanced noise attenuation performance.
• Metal enclosure ensures optimal connection to earth ground for high-frequency suppression.
• Quick-connect terminals facilitate rapid installation and secure wiring.

Applications

• General-purpose electromagnetic interference suppression
• Power supply input filtering for electronic equipment

Procurement Notes

Verify the specific suffix code against official datasheets to confirm terminal type and mounting style. Ensure the selected variant matches the required current rating and certification standards for your target market. Cross-reference manufacturer part numbers with distributor listings to avoid obsolete or incorrect revisions.

Selection Notes

Select this model when a compact, single-phase filter is needed for low-current applications up to 3A. The chassis mount design suits enclosed systems requiring direct grounding. Verify that the 14mH inductance meets system impedance requirements without causing excessive voltage drop during startup.

Part Context

This component belongs to the FN2090 series of single-phase EMC filters manufactured by Schaffner. The series is characterized by metal cases for superior grounding and space-efficient designs allowing multiple circuit stages. These filters are engineered for general industrial and commercial use where reliable noise suppression is critical.

Replacement Considerations

Direct substitutes may include other Schaffner FN2090 variants with adjusted current ratings, such as FN2090B-6-06 or FN2090B-8-06, if higher capacity is acceptable. Verify pinout compatibility and mounting hole alignment before substitution.

FAQ

What is the purpose of the internal bleeder resistor?

The 470kΩ bleeder resistor discharges stored energy from the capacitors after power removal, enhancing safety by reducing residual voltage on the output terminals.

How does the metal case affect performance?

The metal case provides a low-impedance path to earth ground, which significantly improves high-frequency noise attenuation and shielding effectiveness compared to plastic enclosures.