Open Contactors and Overload relays 25 - 425 Amperes, 600 Volts Contactors & Starters Accessories Aux. Contacts, Overloads, Reversing Interlocks Enclosed Starters Riken contactors are available in ratings from 25 to 450 amperes and are also available as assembled starters (non-reversing & reversing). Brochure (4 pg pdf)