A direct current contactor (100, 400), comprising a case and two groups of contact components (11, 11a, 11b) disposed in the case, wherein each group of contact components (11, 11a, 11b) comprises two moving contacts connected to each other and two fixed contacts opposite to the moving contacts, and the fixed contacts extend outside the case; the case has an arc-extinguishing cavity, a first baffle is disposed in the arc-extinguishing cavity and the first baffle divides the arc-extinguishing cavity into a first arc-extinguishing chamber and a second arc-extinguishing chamber, and the two groups of contact components (11, 11a, 11b) are respectively disposed in the first arc-extinguishing chamber and the second arc-extinguishing chamber; and the direct current contactor (100, 400) further comprises a drive system, wherein the drive system is connected to the moving contacts of the two groups of contact components (11, 11a, 11b), and the drive system is configured to drive the moving contacts to move in a direction close to or away from the fixed contacts, so that the moving contacts are disconnected from or connected to the fixed contacts; and wherein the drive system comprises a drive component and a moving component, the moving component comprises a support rod and a moving plate connected to the support rod, the moving plate is located in the arc-extinguishing cavity, and the moving contacts of the two groups of contact components (11, 11a, 11b) are disposed on the moving plate; and the drive component is configured to drive the moving component to move to drive the moving contacts to move, and when the moving contacts are disconnected from the fixed contacts, there is a gap between the first baffle and the moving plate; and characterised in that a groove is disposed on the moving plate, the two side walls of the groove forming two second baffles which extend towards the first baffle, so that the second baffles at least partially overlap the first baffle and the first baffle extends into the groove to jointly isolate and separate the first arc-extinguishing chamber and the second arc-extinguishing chamber. the case has an arc-extinguishing cavity, a first baffle is disposed in the arc-extinguishing cavity and the first baffle divides the arc-extinguishing cavity into a first arc-extinguishing chamber and a second arc-extinguishing chamber, and the two groups of contact components (11, 11a, 11b) are respectively disposed in the first arc-extinguishing chamber and the second arc-extinguishing chamber; and the direct current contactor (100, 400) further comprises a drive system, wherein the drive system is connected to the moving contacts of the two groups of contact components (11, 11a, 11b), and the drive system is configured to drive the moving contacts to move in a direction close to or away from the fixed contacts, so that the moving contacts are disconnected from or connected to the fixed contacts; and wherein the drive system comprises a drive component and a moving component, the moving component comprises a support rod and a moving plate connected to the support rod, the moving plate is located in the arc-extinguishing cavity, and the moving contacts of the two groups of contact components (11, 11a, 11b) are disposed on the moving plate; and the drive component is configured to drive the moving component to move to drive the moving contacts to move, and when the moving contacts are disconnected from the fixed contacts, there is a gap between the first baffle and the moving plate; and characterised in that a groove is disposed on the moving plate, the two side walls of the groove forming two second baffles which extend towards the first baffle, so that the second baffles at least partially overlap the first baffle and the first baffle extends into the groove to jointly isolate and separate the first arc-extinguishing chamber and the second arc-extinguishing chamber.