electronic ballast for circular fluorescent lamp flame retardant PC casing soft start, self-protection 22W/32W/40W/55W t5 Electronic ballast for circular fluorescent lamp1. flame retardant PC casing2. screw-free terminal block3. pre-heat soft start, self-protection function in abnormal status.4. low THD, high PF, sufficient input power5. three years warranty6. SAA CB CE certified