Siemens 3TL8107-1BA00 is a 3-pole vacuum contactor from the 3TL81 family, designed for medium‑voltage switching up to 7.2 kV with a continuous current rating up to 400 A. It uses a 110–250 V AC solenoid coil for actuation and includes four normally open and four normally closed auxiliary contacts for signaling and control. This unit is suited for industrial switchgear applications such as motor control centers and feeders where reliable high‑voltage switching is required at 7.2 kV.
