Siemens 3TK2804-0BB4

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.

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