Siemens 3TF Spare Main Contact Set Size: 2 3TF44 Contactor 3TY7440-0A

Siemens 3TF Spare Main Contact Set Size: 2 3TF44 Contactor The 3TY7440-0A main contact is the contact part of the conductor that supplies power to the main circuit. The cross-section of the contact point between the contacts is designed to be large and can carry greater current. Generally, the main contact of AC contactors can carry a load of 9 to 630 amps, an arc extinguishing cap is also designed between the main contacts to prevent short circuit caused by arcing between the contacts while the contactor is operating. It is referred to as the main contact elements for the movable and 4 fixed contact parts.