Main Systems Ltd is an ISO 9001 accredited bespoke designer and manufacturer of low & medium voltage switchgear, electrical distribution, motor control centre breakers (MCCB), power supply units (PSU) and critical power supply systems for, inter alia; the water industry, chemical and petrochemical industry, ministry of defence (MOD), national health service (NHS), banking, retail, pharmacuetical and specialist industries such as mining and refining