Home › Manufacturers › Siemens › 3TF6944-0CF7

Siemens

Siemens 3TF6944-0CF7 Vacuum Contactor | 820A AC-3

Siemens 820A AC-3 Vacuum Contactor with 110-132V AC Coil.

● In Stock 12-Mo Warranty Same-Day Dispatch Ships Worldwide 🎖 Veteran-Owned

In Stock — Ready to Ship

ManufacturerSiemens

Part number3TF6944-0CF7

Part Number 3TF6944-0CF7

Manufacturer Siemens

Type Vacuum Contactor

Poles 3

Get a price for 3TF6944-0CF7

Response within 1 business hour

🛡

12-month warranty

All units tested

⚡

Same-day dispatch

Order by 2pm CST

🌐

Worldwide delivery

US, EU, Asia, Middle East

🎖

Veteran-owned

CAGE: 9NK75

Vacuum switching technology 820A AC-3 current rating 450kW power handling 110-132V AC coil 4 NO + 4 NC auxiliary contacts Busbar main connection

Product description

The Siemens 3TF6944-0CF7 is a high-performance 3-pole vacuum contactor built for robust industrial applications. It is rated for AC-3e at 630 Amps and AC-3 at 820 Amps, with a power capacity of 450 kW at 400V, suitable for systems up to 690V. This contactor features a conventional drive, a 110-132V AC coil, and an extensive auxiliary contact setup of 4 normally open (NO) and 4 normally closed (NC) contacts. The main circuit connection is via busbar, and control/auxiliary circuits use screw terminals.

This vacuum contactor is ideal for heavy-duty motor control, high-power switching operations, and demanding applications in industries such as power generation, large-scale manufacturing, and infrastructure projects where reliability and high current handling are critical.

Stanlo Automation, a veteran-owned surplus parts distributor, provides the Siemens 3TF6944-0CF7, ensuring you access quality components for your automation needs. We focus on delivering value and dependable surplus inventory to keep your operations running.

Technical specifications

Part Number	3TF6944-0CF7
Manufacturer	Siemens
Type	Vacuum Contactor
Poles	3
AC-3e Rating	630A @ 400V
AC-3 Rating	820A @ 400V
Power	450kW @ 400V
Max Voltage	690V
Coil Voltage	110-132V AC
Auxiliary Contacts	4 NO + 4 NC
Drive	Conventional
Main Circuit	Busbar
Terminals	Screw

Common applications

High Power Motor Control

Industrial Switching

Power Generation

Manufacturing

Infrastructure Projects

Heavy Industry

Compatible systems

Industrial Motor Control Centers High Power Switchgear Power Distribution Systems

Also known as

Siemens 3TF6944 3TF6944 Vacuum Contactor Siemens 820A Contactor

Replaces / compatible with

This high-capacity vacuum contactor is designed for demanding industrial applications and can replace existing contactors requiring high AC-3 current ratings. Verify specifications for compatibility.

Technical note

Expert tip

The busbar connection on the main circuit requires careful alignment and secure fastening to ensure optimal current transfer and prevent overheating, especially under high load conditions.

What happens next?

Email confirmation

Immediate receipt acknowledgment sent to you

Account manager assigned

Confirms your part's spec and condition

Your quote delivered

Tailored to your specific requirements

Frequently asked questions

What is the difference in AC-3e and AC-3 ratings for the Siemens 3TF6944-0CF7?

The Siemens 3TF6944-0CF7 has an AC-3e rating of 630A and an AC-3 rating of 820A. AC-3e is a category for starting asynchronous motors with higher current demands, while AC-3 is for running motors, showcasing the contactor's robust capability.