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3TK2804-0BB4

2-year Warranty

Same Day Shipping

Siemens 3TK2804-0BB4

CONTACTOR COMBINATION FOR SAFETY CIRCUITS, 24 VDC, 1NO/NC, 4 N/O, SCREW TYPE TERMINAL, DIN RAIL MOUNT

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2 Year warranty

Part Number3TK2804-0BB4
ManufacturerSiemens
TypeContactors
Model #3TK28040BB4
Warranty2 Year

Our Repair Services

MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed 3TK2804-0BB4 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this 3TK2804-0BB4 we also repair a wide range of other Siemens products, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty 3TK2804-0BB4, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

  • Shipping Weight : 1lb

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Ask about exchanging your faulty 3TK2804-0BB4 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Siemens 3TK2804-0BB4 Overview

3TK2804-0BB4 Contactor Safety Combinations

The 3TK2804-0BB4 is a sophisticated contractor safety combination designed to be operated exclusively within a switchgear cabinet that offers a degree of protection of IP 54. This product provides users with an EMERGENCY-OFF circuit option and also allows for the monitoring of various protective devices, such as protective screens.

Design and Standards:

This contactor safety combination's internal control circuitry adheres strictly to DIN EN 60204, Part 1 (VDE 0113, Part 1), particularly paragraph 9.4.2.2. This ensures that even if there's a malfunction in one of the contactor relays, the safety circuit's function remains uncompromised. The provided supply voltage must align with the DIN EN 60204 (VDE 0113, Part 1) stipulations, emphasizing the connection of terminals "L-/N; A2" to the side of the control current circuit tied to the protective conductor system. Furthermore, in every ON and OFF machine cycle, the contacts of the contactor relays are meticulously verified for correct opening and closing actions.

Operational Checks:

The contactor relays can be checked using various methods, including:

  • Switching the control voltage using the main switch.
  • Activating and deactivating the EMERGENCY-OFF unit.
  • Proper opening and closing of the protective screen.

For detailed information on circuit diagrams, users can refer to figures like Fig. III (EMERGENCY-OFF circuit) and Fig. IV (Protective screen monitoring) amongst others. For more comprehensive internal circuit diagrams, the Low-Voltage Control Equipment, Switchgear, and Systems Catalog are available.

Specifications & Recommendations:

  • Testing & Installation: Every unit undergoes rigorous testing by the BIA. While external control circuit connections are provided for illustrative purposes, users must decide on the actual connections based on risk assessments. During installation, ensure that no foreign particles fall onto the contactor safety combination. If the environment has excessive dust, dirt, or harmful agents, house the combinations in a protective enclosure.
  • Operating Position & Cleaning: This device can operate in any position. For maintenance, simply vacuum away any accumulated dust.
  • Operating States: Different indicators such as "READY", "ON", and "FEEDBACKCIRCUIT" provide status updates on the unit.
  • Environmental Conditions: The device can operate between temperatures of -25°C to +55°C and can be stored between -55°C to +80°C. Its degree of protection is IP 20.
  • Electrical Properties: The unit conforms to insulation coordination as per DIN VDE 0110 Part 1 and Part 2 (01.89), with rated insulation voltages (Ui) of 400 V for the main circuit and 250 V for the control circuit.

Safety Precautions:

Fuses are imperative for the safe operation of the contactor safety combination. Users must strictly utilize the specified fuses to ensure reliable interruption during faults. For more detailed data and accessory ordering information, users can consult the Catalog NSK.

Performance Metrics:

The device performs across different utilization categories as defined by DIN VDE 0660, Part 100 (07.92), and IEC 60947-1: 1988. Some of its ratings include AC-1/AC-12 6 A at 40°C and 55°C, and AC-3 values for both 230 V and 400 V. Detailed specifications, as aligned with DIN IEC 60255 / VDE 0435 (09.62), are also provided, such as continuous current (Ith) of 10 A (8 A) and making capacities for varying conditions.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 3TK2804-0BB4, take a look at more from our Contactors line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 3TK2804-0BB4 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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Very happy with the overall service, delivery, communication and delivery,

Conley Cooke

I needed a special drive, found it, and I was quickly assisted by Joe Kaminski. Everything was exactly as it should be....

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We have an older DMU80 CNC Machine and the Handheld Control was damaged beyond repair. MRO was very helpful in confirmin...

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