Powerstar contactors have high-power relays, which separate the current flowing to your ballast from your timer.
This piece of equipment is essential when using any ballast over 250 watts and will prevent your timer from fusing. The contactor has a one metre cable for the sockets and plugs.
It is simple to use and requires no wiring. You just plug your ballast and timer into it and away you grow! Powerstar contactors are available in 1Kw, 2Kw and 4Kw models.