SPS has just completed supplying the first batch of traction power converters used by Clayton Equipment in their innovative full-electric and hybrid locomotives. They are rated at up to 180 kW and suitable for use at up to 750 V DC (max) with IP68 rating. Specific steps have been taken with the design to ensure high reliability with the inevitable power cycling such units experience in operation.
Unusually, these are air-cooled to provide packaging flexibility and improve reliability vs a liquid cooled approach. The fans maintain the IP68 rating and give several years of life before servicing is required. The converters can be supplied liquid cooled if required.