NBM-20-331-D

Overview

The Cosel NBM-20-331-D is a single-phase EMC/EMI power line filter designed for AC 250 VAC and DC 250 VDC applications. It supports a continuous current rating of 20 A with a capacitance value of 330 pF. The unit features low leakage current specifications, rated at 37.5 uA typical and 75 uA maximum. It utilizes push-down terminal connections and is engineered for DIN rail mounting. The component weighs 270 g and belongs to the NB series.

Feature Summary

• Low leakage current design suitable for sensitive equipment
• Single-phase two-stage filtering architecture
• Push-down terminal connection system
• DIN rail installation compatibility

Applications

• Industrial control systems requiring low leakage
• Medical equipment power conditioning
• Electronic test and measurement devices
• Precision instrumentation power supplies

Procurement Notes

Verify the specific suffix 'D' indicates DIN rail mounting and push-down terminals, distinct from chassis mount variants. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure input voltage ratings match the 250 VAC/DC specification. Validate that the 20 A current rating aligns with the load requirements. Check for updated certification marks such as UL, CSA, or VDE in the latest datasheet revision.

Selection Notes

Select this model when low leakage current is critical for safety or signal integrity. The 330 pF capacitance offers a balance between noise attenuation and leakage limits. Compare against NBM-20-221-D for lower capacitance needs or NBM-20-471-D for higher filtering if leakage permits. Ensure the DIN rail form factor fits the enclosure constraints. Verify terminal type compatibility with existing wiring harnesses.

Part Context

This component is part of the Cosel NB series power line filters. The series includes various current ratings and capacitance values. The NBM-20-331-D specifically targets the 20 A category with moderate capacitance. It shares the same physical footprint and terminal style within its current class. The series is designed for industrial and medical grade applications.

Replacement Considerations

NBM-20-221-D offers lower capacitance (220 pF) with similar current and mounting characteristics. NBM-20-471-D provides higher capacitance (470 pF) but increased leakage current. NBM-16-331-D is a lower current variant (16 A) with identical capacitance and mounting. Verify electrical parameters before substitution.