The electrical fuses were replaced with circuit breakers. Some types can also include fuses and switches. The operator is protected from electrocution by safety switches and fuses. Inside were 120 controls&colon; 55 electrical switches, 30 fuses and 35 mechanical levers. Over-current protection (fuses or circuit breakers) must be provided. The sperm nucleus then fuses with the ovum, enabling fusion of their genetic material. Brown's music sensibility fuses pop-rock stylings with theatrical lyrics. His work fuses elements of realism and the fantastic. The group fuses theatrical performance styles with queer protest. Kawada's musical style mainly fuses rock with trance. The devices were rarely triggered by pressure fuses. There are two types of hydraulic fuses. Theory predicts, however, that the hydrogen isotope deuterium fuses with hydrogen-1, creating helium-3. Nitrocellulose lacquers are also used to make firework fuses waterproof. Lucas Glass tube fuses have straight ends.