CW3DC universal circuit breakers (hereinafter referred to as circuit breakers) have two specifications: CW3DC-2500 forDC1000V and below and CW3DC-250OHU for DC1500V and below.They maintain the same dimensions and mounting di-mensions as CW3-2500 AC circuit breakers. It is mainly installed in the low-voltage DC distribution circuit to connect anddisconnect the main circuit, and can play an isolating role.The symbol is expressed as"