RWB1778 – Fuse holder – square head with side entry red cap. Suits RWB 537 & 540 vertical switch panels. SP324 – Red cap only for RWB1778 RWB1779 – Fuse holder – square head with top entry red fuse cap. Suits RWB2073 – 2073B horizontal switch panels. Replacement/Spare SP324 Red cap only for RWB1778
