156M

Overview

The Hammond Manufacturing 156M is an unshielded DC filter choke designed for open channel mounting. It features a nominal inductance of 3 H with a tolerance of ±15%. The component supports a maximum DC current of 100 mA and exhibits a maximum DC resistance of 86 ohms, also within a ±15% tolerance. It is rated for a maximum operating voltage of 400 VDC. Physical dimensions are approximately 82.6 mm in length, 47.6 mm in width, and 50.7 mm in height. The unit utilizes wire leads for termination and is constructed for chassis mount installation.

Feature Summary

• Unshielded construction suitable for applications where magnetic interference is manageable
• Open channel design facilitates efficient thermal dissipation during operation
• Chassis mount configuration ensures stable mechanical integration into equipment frames

Applications

• Low to medium current DC reactor circuits
• Power supply filtering applications requiring specific impedance characteristics
• Industrial control systems utilizing DC power distribution

Procurement Notes

Verify the exact physical dimensions against the official Hammond Manufacturing datasheet prior to integration, as manufacturing tolerances may affect chassis fitment. Confirm that the 86-ohm DC resistance aligns with the system's voltage drop requirements at the target 100 mA operating current. Ensure the 400 VDC rating exceeds the peak circuit voltage to prevent insulation breakdown. Cross-reference the lead spacing with existing PCB or terminal block layouts to guarantee proper connectivity without mechanical stress.

Selection Notes

Select this component when a high-inductance value is required for low-current DC filtering applications. The 3 H inductance provides significant ripple reduction compared to lower-value alternatives. Consider the unshielded nature of the device; it is appropriate only when adjacent components are not sensitive to stray magnetic fields. The open channel structure makes it suitable for natural convection cooling environments. Evaluate the 86-ohm resistance impact on overall circuit efficiency before finalizing the design choice.

Part Context

The 156M belongs to the Hammond Manufacturing series of DC reactors and filter chokes. These components are engineered for robust performance in industrial and commercial power electronics. The series typically offers various inductance and current ratings to suit different filtering needs. The 156M specifically targets applications demanding higher inductance at lower current levels, distinguishing it from high-current power inductors in the same product family.

Replacement Considerations

No public confirmed substitute part numbers are available.