Part Number: 6278140121
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: 3.2 (g)
Chart Legend
•Dimensions (Top numbers are in millimeters, bottom numbers are in nominal inches.).
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 14.3 | ± 0.30 | 0.563 | _ |
| B | 5.2 | ± 0.10 | 0.205 | _ |
| C | 6.6 | ± 0.20 | 0.26 | _ |
| D | 3.25 | ± 0.15 | 0.128 | _ |
| E | 10.4 | ± 0.20 | 0.409 | _ |
| F | 4.8 | ± 0.10 | 0.189 | _ |
| G | 6 | min | 0.237 | min |
| J | 12.05 | ± 0.25 | 0.474 | _ |
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) | 1650 ±25% |
| Ae(cm²) | 0.233 |
| Σl/A(cm⁻¹) | 10.3 |
| le(cm) | 2.39 |
| Ve(cm³) | 0.555 |
| Amin(cm²) | 0.181 |
AL value is measured at 1 kHz, B < 10 gauss.