SIEMENS makes several series of motor control products. The most popular of them are the 3TF series contactors and the 3UA overloads. The SIEMENS 3TF series contactors feature a patented arc-quenching system which diverts arcs away from the contact surfaces and extinguishes them efficiently. This enhances the life of the contacts. These contactors also feature a very short debounce time (less than 2 milliseconds) which further enhances the life. The innovative design of the 3TF contactors provides inrush current capacity up to 1200% FLA. This makes them ideal for modern high-efficiency motors.
The companion 3UA overload relays provide also phase loss and unbalanced load protection. All sizes have an isolated alarm contact and a test button. (Smaller sizes are also available without these.) They also have the most important feature an overload can have: SIEMENS RELIABILITY! Overloads are there in case something goes wrong. Why trust an inferior brand? SIEMENS sells more industrial controls worldwide than anyone else.
A full line of accessories is available for both the 3TF contactors and the 3UA overload relays.