Communication-capable Circuit Breakers

WL Circuit Breaker

Breaker Status Sensor (BSS)

BSS stands for "breaker status sensor." All microswitches that contain information on the state of the circuit breaker are either installed directly to the BSS or connected to it. The BSS makes this digital information available on the CubicleBUS.

If the status of the circuit breaker in the switchgear is to be displayed or read via communications, the BSS module and the appropriate signaling switch must be installed (if they are not already). The circuit breaker must be installed with an electronic trip unit of type ETU745 or higher.

The BSS can also be field installed.

The BSS indicates the following information:

Closing spring (charged/discharged)

Position of the main contacts (open/closed)

Ready-to-close signal

Bell Alarm switch on the trip unit (connected to the red mechanical trip indicator)

Signaling switch on the first shunt trip

Signaling switch on the second shunt trip

The BSS is included when you order the communications option with with the assembled circuit breaker.

If a BSS is required without communication (e.g. for operating the BDA), it can be ordered seperately.

Figure

This picture shows the BSS signaling contacts and how they have to be connected.

The BSS is factory installed when the communications option is ordered with the

2-3

assembled breaker.

 

 

 

2/12

WL MODBUS Communication and Electronic Accessories • January 2005

Page 23
Image 23
Siemens UL 489, UL1066 specifications Breaker Status Sensor BSS

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.