BlogI - There are 2 types of direct contactors
- MCD contactors: they are more expensive, however, they consume the same amount of power during the inrush and the hold of the coil. For instance, with a MCD10 it is 3W in inrush and hold of the coil.
- MC contactors: they are less expensive but they consume more during the inrush. For instance, for a MC10, 75W in inrush and 2W in hold. You will need a more powerful power supply.
II - How to connect them?
- MCD: The contactor’s coil power supply (the command) is connected to A1 and A2 terminals: the + 24 VDC to A1 and the 0 V CC to A2.
III - Additional accessories
- Auxiliary contacts: You can always add auxiliary contacts in the 3 remaining spots, as shown in the photo below.
- The mechanical interlocking: to prevent two contactors from being acuated simultaneously (example: motor rotation direction reversal, coupling, …)
- Thermal relays: you will have to mount it at the contactor’s output in order to protect the system against overloads.
