Part Number: 6278230121
78 RM CORE SET
RM (Rectangular Modulus) cores allow better shielding than E type geometries while also providing easier winding accessibility and better power dissipation than a pot core configuration. Fair-Rites standard RM cores all have a solid center post and standard height, low profile and alternate materials are available upon request.
RM cores can be supplied with the center post gapped to a mechanical dimension or an AL value.
Weight indicated is per pair or set.
Weight: 13 (g)
Chart Legend
•Dimensions (Top numbers are in millimeters, bottom numbers are in nominal inches.).
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 22.75 | ± 0.45 | 0.896 | _ |
| B | 8.2 | ± 0.10 | 0.323 | _ |
| C | 10.8 | ± 0.20 | 0.425 | _ |
| D | 5.5 | ± 0.15 | 0.217 | _ |
| E | 17.3 | ± 0.30 | 0.681 | _ |
| F | 8.4 | ± 0.15 | 0.331 | _ |
| G | 9.8 | min | 0.386 | min |
| J | 19.1 | ± 0.40 | 0.752 | _ |
Chart Legend
Σl/A : Core Constant, le : Effective Path Length, Ae : Effective Cross-Sectional Area, Ve : Effective Core Volume
AL : Inductance Factor 
Explanation of Part Numbers: Digits 1 & 2 = product class and 3 & 4 = material grade.
| Electrical Properties | |
| AL(nH) | 3000 ±25% |
| Ae(cm²) | 0.6 |
| Σl/A(cm⁻¹) | 6.7 |
| le(cm) | 4.03 |
| Ve(cm³) | 2.419 |
| Amin(cm²) | 0.554 |
AL value is measured at 1 kHz, B < 10 gauss.