High Capacity Photorelays Toshiba High Capacity Photorelays are available as solid state relays (SSR) or MOSFET output optocouplers and are typically used as signal relay replacements. High-capacity photorelays include products with ION>,1A on-state current. Photorelays are semiconductor relays made up of an LED optically coupled to a MOSFET. Optocouplers are used for various applications, ranging from industrial equipment to home appliances and equipment. These Toshiba single-circuit photorelays can handle both AC and DC loads. Photorelays are available in either through-hole or SMT/SMD mounting styles. In addition, the series is offered in several package types. The operating temperature range is -20°C to +110°C.