House Service Cut-out Main Fuses
These type IIa / 2a and IIb / 2b house service cut-out main fuse links are used to protect an entire house.
Lawson MF and ME cartridge fuses are the same length, but the MF fuses are fatter.
| Fuse Type | Lawson Ref | Length | Diameter |
| IIa / 2a | ME | 57mm (2-1/4") | 22.23mm (7/8") |
| IIb / 2b | MF | 57mm (2-1/4") | 30.16mm (1-3/16") |
Lawson type ME & MF house service fuse-links meet the requirements of both BS1361:1971 and BS88-3:2010.
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