RM Cores (6278370121)Part Number: 6278370121
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: 46 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 36.75 | ± 0.75 | 1.447 | _ |
| B | 12.25 | ± 0.15 | 0.482 | _ |
| C | 15.85 | ± 0.25 | 0.624 | _ |
| D | 8.55 | ± 0.20 | 0.337 | _ |
| E | 25.45 | ± 0.55 | 1.002 | _ |
| F | 12.6 | ± 0.20 | 0.496 | _ |
| G | 13.4 | min | 0.528 | min |
| J | 29.2 | ± 0.60 | 1.15 | _ |
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) | 5400 ±25% |
| Ae(cm2) | 1.41 |
| Σl/A(cm-1) | 4.3 |
| le(cm) | 6.13 |
| Ve(cm3) | 8.675 |
| Amin(cm2) | 1.247 |
AL value is measured at 1 kHz, B < 10 gauss.