With fully digital control technology which is based on SCR, one microprocessor controls one circuit. The structure is so compact by advantage of its modular-drawer design. Its most notable features are: easy operation, powerful performance, high reliability and precision, low noise, discharge with feedback to grid. Operator can judge the malfunctions and take corresponding solutions according to the malfunction information that the equipment provide by its self-examination character. Equipment under 6A adopting patent fastfuse-free technology can provide much more convenience to customers. μC-3000SH is low harmonic & environmental-protection machine.