Digital device for automatic converting of spare power supply csb-21a wins the favor of the users because of its good performance, high reliability, complete function, strong flexibility and convenient debugging and maintenance.

• 数字式备自投保护装置CSB21A以其性能优、可靠性高、功能齐全、灵活性强、调试维护方便等优势越来越受到用户的青睐，在电力系统中得到了广泛的应用。