Communication-capable Circuit Breakers

WL Circuit Breaker

Metering Function Plus

The integrated metering function can be used with all trip units with a CubicleBUS connection. It not only extends the range of protection functions of the trip unit but also provides additional warnings and diagnostic options. With its comprehensive range of measured values, the integrated WL Circuit Breaker metering function is an excellent alternative to external multi- function metering devices.

General

In addition to the current values supplied by the trip unit, the metering function provides the measured values in the power distribution system required for Power Management (voltage, power, etc.). With its extended protection function (e.g. undervoltage), the metering function also provides further options for monitoring and protecting the power distribution system.

The option of generating warnings if setpoints are exceeded, speeds up response to system alerts. As a result, the metering function can significantly increase system up-time.

The metering function module is installed on the back of the trip unit (ETU), as shown in Fig. 2-4. The trip unit and metering function module exchange all current data via a high- speed synchronous interface. The metering function module provides all the connected modules (e.g. the COM16 module or BDA) with the parameters for the protective relay functions, the setpoints, measured value settings, and the measured values via the CubicleBUS, so that they can be processed further. Using the two CubicleBUS connections, the metering function module is connected to the trip unit and either the BSS or directly to X7.

The metering function can be implemented in all circuit breakers with ETU745, ETU755, ETU748 and ETU776. If the Metering Function PLUS module is ordered with the assembled circuit breaker, it will already be installed and ready for operation. The metering function can be retrofitted at any time if the circuit breaker is equipped with one of the trip units listed above. It is simply screwed onto the trip unit and the CubicleBUS lines are snapped in.

Note: If installed by the customer, the metering function is not calibrated with the trip unit; therefore, the accuracy of the specifications in Table 2-7 cannot be guaranteed.

The Metering Function Plus is located on the back of the trip unit. When ordered as Figure part of an assembled breaker catalog number, it is already installed and ready for

2-4operation.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL1066, UL 489 specifications Metering Function Plus, General
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UL 489, UL1066 specifications

Siemens UL1066 and UL489 are essential components in the landscape of electrical equipment, specifically in circuit protection and control. These standards ensure reliability, safety, and efficiency in various applications, including industrial, commercial, and residential settings.

The Siemens UL1066 is primarily focused on disconnect switches. These devices are designed to isolate electrical circuits, ensuring the safety of both personnel and equipment during maintenance or in case of faults. One of the key features of UL1066 disconnect switches is their high breaking capacity, enabling them to handle significant fault currents without failure. This characteristic is crucial in protecting downstream equipment from damage caused by short circuits. The UL1066 switches are also known for their robust construction, often featuring a metal enclosure that enhances durability and environmental resistance. Additionally, these switches can be operated manually or remotely, offering flexibility in operation and control.

On the other hand, Siemens UL489 circuit breakers provide comprehensive protection against overcurrents and short circuits. These devices not only interrupt fault currents but also protect connected devices from damage due to overload situations. Key features of UL489 circuit breakers include adjustable trip settings, which allow users to customize the response to overcurrent conditions based on specific application requirements. This adaptability makes them suitable for a wide range of environments, from large industrial plants to smaller commercial buildings.

Both UL1066 and UL489 products are constructed with advanced technologies, such as thermal-magnetic or electronic trip mechanisms in UL489 devices, ensuring precise and timely interruption of fault currents. These technologies promote energy efficiency and stability within electrical systems. In addition, many of these devices are equipped with indication features, providing clear visual status cues for quick assessment in emergency situations.

In terms of characteristics, both UL1066 and UL489 devices adhere to rigorous testing and certification processes to meet UL standards. This compliance assures users of their performance and reliability. Furthermore, the devices are designed to accommodate a wide range of operating temperatures and environmental conditions, making them versatile choices for various applications.

In summary, Siemens UL1066 and UL489 devices are paramount in ensuring safety and efficiency in electrical circuits. Their advanced features and robust construction make them indispensable in protecting both personnel and equipment in an array of industrial and commercial applications.
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