Profile: B and S Electronic Services Ltd specializes in contract electronic manufacture and assembly services. We design & manufacture electrical power equipments. We offer a wide range of bespoke products, from a small standalone switch board to a fully PLC controlled packaged sub-station. We offer a wide range of power distribution units (PDU's) for a number of critical loads within banks, telecom's, television studios, internet data centres and computer suites. PDU's distribute clean electrical power, usually downstream of a UPS system, for a wide range of applications. They enable reliable operation in harmonic rich environments and are designed to minimise down time for maintenance. PDU's incorporate static transfer switches (STS) as an incoming device. The STS enables permanent monitoring of the supply, and in the event of a failure the STS will transfer the load to an alternative supply and back to the original when available without the inclusion of an isolation transformer each PDU would pass all load generated harmonics back to its supply point.