Siemens 3TF6944-0CM7 | Industrial Automation Component
Siemens 3TF6944-0CM7 | Industrial Automation Component

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Siemens

Siemens 3TF6944-0CM7 | Industrial Automation Component

SKU: 3TF6944-0CM7
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$3,544.90
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vacuum contactor AC-3e 630 A, 335 kW / 400 V, AC-3 820 A, 450 kW / 400 V, Ue 690 V, 3-pole, Uc: 200-240 V AC(50/60 Hz) drive: conventional auxiliary contacts 4 NO + 4 NC main circuit: busbar control and auxiliary circuit: screw terminal

Product Type: Industrial Automation Component

General

Article number 3TF6944-0CM7
product designation Vacuum contactor
product type designation 3TF6

General technical data

size of contactor 14

product extension

● function module for communication No
● auxiliary switch No

insulation voltage

● of main circuit with degree of pollution 3 rated value 1 000 V
● of auxiliary circuit with degree of pollution 3 rated value 690 V

surge voltage resistance

● of main circuit rated value 8 kV
● of auxiliary circuit rated value 6 kV

maximum permissible voltage for protective separation

● in networks with grounded star point between auxiliary and auxiliary circuit 300 V
● in networks with grounded star point between main and auxiliary circuit 500 V

shock resistance at rectangular impulse

● at AC 9.5 g / 5 ms, 5.7 g / 10 ms

shock resistance with sine pulse

● at AC 13.5 g / 5 ms, 7.8 g / 10 ms

mechanical service life (operating cycles)

● of contactor typical 5 000 000
reference code according to IEC 81346-2 Q
Substance Prohibitance (day/month/year) 03/01/2017
SVHC substance name Lead CAS-No. 7439-92-1 Lead monoxide (lead oxide) CAS-No. 1317-36-8
Net Weight 22.202 kg

Ambient conditions

installation altitude at height above sea level maximum 2 000 m

ambient temperature

● during operation -25 ... +55 °C
● during storage -55 ... +80 °C
relative humidity minimum 10 %
relative humidity during operation 10 ... 95 %
relative humidity at 55 °C according to IEC 60068-2-30 maximum 95 %

Main circuit

number of poles for main current circuit 3
number of NO contacts for main contacts 3
number of NC contacts for main contacts 0
type of voltage for main current circuit AC

operating voltage

● at AC-3 rated value maximum 690 V
● at AC-3e rated value maximum 690 V

● at AC-1

— up to 690 V at ambient temperature 40 °C rated value 910 A
— up to 690 V at ambient temperature 55 °C rated value 850 A

● at AC-3

— at 400 V rated value 820 A
— at 500 V rated value 820 A
— at 690 V rated value 820 A
— at 230 V rated value 260 kW
— at 400 V rated value 450 kW
— at 500 V rated value 600 kW
— at 690 V rated value 800 kW

● at AC-3e

— at 400 V rated value 630 A
— at 500 V rated value 630 A
— at 690 V rated value 630 A
● at AC-4 at 400 V rated value 690 A
— at 230 V rated value 200 kW
— at 400 V rated value 355 kW
— at 690 V rated value 600 kW
— at 400 V maximum 500 1/h
— at 690 V maximum 500 1/h
● at AC-2 at AC-3 maximum 200 1/h
● at AC-2 at AC-3e maximum 200 1/h

● at AC-6a

— up to 500 V for current peak value n=20 rated value 675 A
— up to 690 V for current peak value n=20 rated value 675 A
— up to 400 V for current peak value n=30 rated value 450 A
— up to 500 V for current peak value n=30 rated value 450 A
— up to 690 V for current peak value n=30 rated value 450 A

connectable conductor cross-section in main circuit at AC-1

● at 40 °C minimum permissible 600 mm²

operational current for approx. 200000 operating cycles at AC-4

● at 400 V rated value 360 A
● at 690 V rated value 360 A

operating apparent power at AC-6a

● up to 400 V for current peak value n=20 rated value 445 kVA
● up to 690 V for current peak value n=20 rated value 771 kVA
● up to 400 V for current peak value n=30 rated value 297 kVA
● up to 690 V for current peak value n=30 rated value 514 kVA
thermal short-time current limited to 10 s 7 000 A
power loss [W] at AC-3 at 400 V for rated value of the operational current per conductor 70 W
power loss [W] at AC-3e at 400 V for rated value of the operational current per conductor 42 W
no-load switching frequency at AC 500 1/h

operating frequency

● at AC-1 maximum 500 1/h

Control circuit/ Control

type of voltage of the control supply voltage AC

control supply voltage at AC

● at 50 Hz rated value 200 ... 240 V
● at 60 Hz rated value 200 ... 240 V

operating range factor control supply voltage rated value of magnet coil at AC

● at 50 Hz 0.8 ... 1.1
● at 60 Hz 0.8 ... 1.1
inrush current peak 18 A
duration of inrush current peak 300 µs
pickup current mean value 4.5 mA
pickup current peak 5.5 A
duration of pickup current 150 000 µs
holding current mean value 35 mA

● at minimum rated control supply voltage at AC

— at 50 Hz 900 VA
— at 60 Hz 900 VA
— at 50 Hz 7 VA
— at 60 Hz 7 VA

● at maximum rated control supply voltage at AC

— at 60 Hz 1 050 VA
— at 50 Hz 1 050 VA
— at 50 Hz 8 VA
— at 60 Hz 8 VA

inductive power factor with closing power of the coil

● at 50 Hz 1
● at 60 Hz 1

inductive power factor with the holding power of the coil

● at 50 Hz 0.4
● at 60 Hz 0.4

closing delay

● at AC 70 ... 120 ms

opening delay

● at AC 50 ... 130 ms
arcing time 10 ... 15 ms
control version of the switch operating mechanism Standard A1 - A2

number of NC contacts for auxiliary contacts

● attachable 4
● instantaneous contact 4

number of NO contacts for auxiliary contacts

● attachable 4
● instantaneous contact 4
operational current at AC-12 maximum 10 A

operational current at AC-15

● at 230 V rated value 5.6 A
● at 400 V rated value 3.6 A
● at 500 V rated value 2.5 A
● at 690 V rated value 2.3 A
operational current at DC-12 at 440 V rated value 0.33 A

operational current at DC-12

● at 24 V rated value 10 A
● at 48 V rated value 10 A
● at 110 V rated value 3.2 A
● at 125 V rated value 2.5 A
● at 220 V rated value 0.9 A
● at 600 V rated value 0.22 A

operational current at DC-13

● at 24 V rated value 10 A
● at 48 V rated value 5 A
● at 110 V rated value 1.14 A
● at 125 V rated value 0.98 A
● at 220 V rated value 0.48 A
● at 600 V rated value 0.07 A
contact reliability of auxiliary contacts one incorrect switching operation of 100 million switching operations (17 V, 5 mA)

full-load current (FLA) for 3-phase AC motor

● at 480 V rated value 820 A
● at 600 V rated value 820 A

● for 3-phase AC motor

— at 200/208 V rated value 290 hp
— at 220/230 V rated value 350 hp
— at 460/480 V rated value 700 hp
— at 575/600 V rated value 860 hp
contact rating of auxiliary contacts according to UL A600 / Q600

● for short-circuit protection of the main circuit

— with type of coordination 1 required gG: 1250 A (690 V, 100 kA)
— with type of coordination 2 required gG: 630 A (690 V, 50 kA), aM: 630 A (690 V, 50 kA), BS88: 630 A (690 V, 50 kA)
● for short-circuit protection of the auxiliary switch required fuse gG: 10 A

Installation/ mounting/ dimensions

mounting position with vertical mounting surface +/-90° rotatable, with vertical mounting surface +/- 22.5° tiltable to the front and back
fastening method side-by-side mounting Yes
fastening method screw fixing
height 295 mm
width 230 mm
depth 237 mm

● with side-by-side mounting

— forwards 20 mm
— upwards 10 mm
— downwards 10 mm
— at the side 10 mm

● for grounded parts

— forwards 20 mm
— upwards 10 mm
— at the side 10 mm
— downwards 10 mm

● for live parts

— forwards 20 mm
— upwards 10 mm
— downwards 10 mm
— at the side 10 mm

type of electrical connection

● for main current circuit Connection bar
● for auxiliary and control circuit screw-type terminals
● at contactor for auxiliary contacts Screw-type terminals
width of connection bar 40 mm
thickness of connection bar 6 mm
diameter of holes 13.5 mm
number of holes 1

type of connectable conductor cross-sections for main contacts

● stranded 50 ... 240 mm²
● finely stranded with core end processing 50 ... 240 mm²

connectable conductor cross-section for main contacts

● finely stranded with core end processing 240 ... 50 mm²

connectable conductor cross-section for auxiliary contacts

● solid or stranded 0.5 ... 2.5 mm²
● finely stranded with core end processing 0.5 ... 2.5 mm²

● for auxiliary contacts

— solid 2x (0.5 ... 1.0 mm²), 2x (1.0 ... 2.5 mm²)
— finely stranded with core end processing 2x (0.5 ... 1.0 mm²), 2x (0.75 ... 2.5 mm²)
● for AWG cables for auxiliary contacts 2x (18 ... 12)
AWG number as coded connectable conductor cross section for main contacts 500
AWG number as coded connectable conductor cross section for auxiliary contacts 18 ... 12

product function

● mirror contact according to IEC 60947-4-1 Yes; One NC contact each must be connected in series for the right and left auxiliary switch block respectively
● positively driven operation according to IEC 60947-5-1 No
● suitable for safety function Yes
service life maximum 20 a
test wear-related service life necessary Yes

proportion of dangerous failures

● with low demand rate according to SN 31920 40 %
● with high demand rate according to SN 31920 73 %
B10 value with high demand rate according to SN 31920 1 000 000
failure rate [FIT] with low demand rate according to SN 31920 100 FIT

ISO 13849

device type according to ISO 13849-1 3
overdimensioning according to ISO 13849-2 necessary Yes

IEC 61508

safety device type according to IEC 61508-2 Type A

Electrical Safety

protection class IP on the front according to IEC 60529 IP00; IP20 with cover
touch protection on the front according to IEC 60529 finger-safe, for vertical contact from the front with cover

General Product Approval

CCC Yes
cULus Yes
EAC Yes
EU declaration of conformity Yes
UK Declaration of Conformity Yes

Functional Saftey

Type Examination Certificate Yes

Test Certificates

Type Test Certificates/Test Report Yes
Special Test Certificate Yes
Miscellaneous Yes

Maritime application

BV (Bureau Veritas) Yes
DNV (Det Norske Veritas) Yes
PRS (Polski Register of Shipping) Yes
RMRS (Russian Maritime Register) Yes

other

Confirmation Yes
Miscellaneous Yes
Chinese Quality Checkmark Yes

Characteristic curves https://curves.simaris.siemens.com/curves/

last modified: 4/4/2026
Date7/28/2026 Subject to change without notice© Copyright Siemens 2026

Applications

This Industrial Automation Component is designed for industrial automation applications, offering reliable performance and compatibility with Siemens automation systems. Suitable for manufacturing, process control, and building automation environments.

Place your order before 14:00 for earliest possible shipment handover. With round-the-clock transit operated by our partnered global logistics providers, parcels reach most international destinations following routine customs processing. Normal delivery takes 2–6 business days subject to customs clearance progress.Shipping fees will be charged for all orders under USD 500, and the exact shipping cost will be determined and collected by our logistics carriers. Shipments to remote international regions will incur additional courier surcharges to offset extra cross-border transportation costs.

Factory warranty service is not applicable to this industrial control equipment, and extended warranty packages are not provided for this item.
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