Siemens 3TF6844-0CM7 Vacuum Contactor

Feature & Principle

It is Siemens SIRIUS 3TF6 series vacuum contactor. The contacts work inside vacuum chamber, effectively suppress electric arc when switching large current. It is used for frequent switching of high-power three-phase motors. With strong arc extinction capability, low contact ablation and long service life. It can be matched with thermal relay for motor overload protection, widely used in water pump, fan and crusher control.

Specifications

Model: 3TF6844-0CM7 Brand: Siemens Series: 3TF6 Pole: 3P AC-3 rated current: 630 A Rated power @400V: 335 kW Operational voltage Ue: 690 V Coil voltage: 200~240 V AC Auxiliary contacts: 4NO + 4NC Size: Size14 Application: Heavy-duty motor, water pump, fan, crusher control cabinet Certification: CE, UL

Components & Diagnostics

Vacuum contact tube, electromagnetic coil, spring mechanism, auxiliary contact set, busbar terminal. Common faults: coil burnout, vacuum tube leakage, contact adhesion, auxiliary contact failure.

Product Brief

3TF6844-0CM7 vacuum contactor, Siemens high current motor switching spare widely used for heavy load MCC cabinet overhaul and replacement.