3TK2804 PDF Datasheet – Contactor Safety Combination

This post explains for the Contactor.

The Part Number is 3TK2804.

The function of this semiconductor is Contactor Safety Combination.

Manufacturer: Siemens

Preview images :




A contactor is an electrical switching device that is used to control the flow of electricity in an electric circuit. It is an electromagnetic relay with high current capacity, typically used to switch heavy loads in industrial and commercial applications. Contactors are designed to handle large electrical currents and are commonly used to control electric motors, heating elements, lighting systems, and other high-power devices.

1. Switching High Currents: Contactors are designed to handle high electrical currents, making them suitable for controlling devices that require a lot of power, such as electric motors used in industrial machinery.

2. Electromagnetic Operation: Contactors use an electromagnetic coil to control the opening and closing of electrical contacts. When an electric current is applied to the coil, it generates a magnetic field that attracts a movable armature, closing the contacts and allowing current to flow through.


Functions and connections :

The internal control circuit of the contactor safety combination is designed according to DIN EN 60204, Part 1 (VDE 0113, Part 1), para., so that in the case of a fault in one of the contactor relays the function of the safety circuit is maintained.

The supply voltage must meet the requirements of the DIN EN 60204 (VDE 0113, Part 1) (the terminals “L-/N; A2“ must be connected to that side of the control current circuit which is linked to the protective
conductor system).


The contactor safety combinations can be used in EMERGENCY-OFF circuits and for monitoring protective devices (e.g. protective screens).


Other data sheets are available within the file: 3TK2804-0BB4

3TK2804 PDF Datasheet

Related articles across the web

3TF47 PDF – 3-Phase, AC Contactor – Siemens

Part Number: 3TF47

Function: AC Contactor ( 3-phase IEC rated contactor )

Manufacturer: Siemens

Product Image:

3TF47 pdf datasheet


3TF47 is 3-Phase, AC Contactor. An AC (Alternating Current) contactor is an electrical switching device used to control and manage the flow of electrical power in an alternating current circuit. It is commonly used in industrial and commercial applications for controlling motors, lighting, heating, ventilation, air conditioning (HVAC) systems, and other electrical loads.

AC contactors are controlled by a control circuit, often connected to a control device like a switch, relay, or programmable logic controller (PLC). When the control circuit is energized, it energizes the coil of the contactor, closing the main contacts and allowing the current to flow to the load. When the control circuit is de-energized, the coil loses its magnetic field, and the main contacts open, interrupting the current flow to the load.

Order No. Power consumption of coil (50Hz) p.f. Closed (VA) 0.29 68 0.29 68 0.29 68 0.29 68 p.f. Conventional thermal current (A) Conventional thermal current of auxiliary contacts Rated insulation voltage of auxiliary contacts Rated operational current of auxiliary contacts (A) Weight (kg) AC – 15 380/220V DC – 13 110/220V 0.82 20 10 690 6/10 0.9/0.45 0.37 0.82 20 10 690 6/10 0.9/0.45 0.43 0.82 20 10 690 6/10 0.9/0.45 0.37 0.82 20 10 690 6/10 0.9/0.45 0.43 Note: 3TX4 auxiliary contact blocks for 3TF3 series, see P2/16. 2/2 Selection and ordering data 3TF AC Contactors AC operation 3TF32 3TF42 3TF33 3TF43 Auxiliary contacts[…]

3TF47 contactor siemens

The 3TF47 is used to switch and control high-voltage and high-current loads, such as electric motors, heating elements, lighting systems, and other industrial machinery. It is often used in motor control centers, switchgear, and control panels to provide reliable and safe switching of electrical power.

3TF47 PDF Datasheet