Electric control system and electric control device

The invention discloses an electric control system and an electric control device. In the electric control system, a signal output part, a corresponding relay, a corresponding controlled load and a corresponding mounting part are defined as a control chain; a first fool-proof structure is formed between the signal output part and the signal connection part of each control chain, so that any signal output part is only suitable for being mechanically connected to the corresponding signal connection part; and a second fool-proof structure is formed between the relay of each control chain and the mounting part, so that any relay is only suitable for being mounted on the corresponding mounting part. In the electric control device, at least one of the shapes and the structures of the signal connecting parts of the relays is different from each other. The relays are installed on the corresponding installation portions of the containing part, the portions, suitable for being connected with the installation portions,