Communication-capable Circuit Breakers

WL Circuit Breaker

Short-circuit at 1:

Only -Q1 establishes that a short- circuit has occurred and does not receive a blocking signal from a subordinate level. For this reason,

it trips after tZSI = 50 ms. Time saved = 250 ms.

The ZSI function can be used for short-circuits between the phases (S), with respect to ground (G), or for both simultaneously (S+G). The operating mode is set using the rotary switch. If the switch is in the "OFF" position, the ZSI is deactivated.

The ZSI module also provides the blocking signal for the medium- voltage level.

If a tie breaker is used in the power distribution system, this can also be equipped with the ZSI function and integrated in the overall concept.

Up to 8 circuit breakers can be connected to ZSI IN, and up to 20 to

ZSI OUT.

The ZSI module must always be the first external CubicleBUS module to be connected to the COM16 module or to X8.

Test function

The outputs are set (i.e. a blocking signal is sent to other circuit breakers) when the rotary switch is set to "TEST".

Pressing the "TEST" key switches the ZSI module to test mode, which is indicated by the yellow DEVICE LED. The inputs and outputs are selected in the same way as the digital input/output modules. When the ZSI module input is selected, the input can be toggled internally by pressing and releasing the TEST key. When the outputs are selected, the outputs can be toggled by pressing and releasing the TEST key. This enables the circuit to be checked.

Active inputs and outputs are indicated by a yellow LED.

It is recommended that the ZSI signal be transmitted via a shielded twisted pair with a cross-section of at least

0.75mm2 (18 AWG), and no more than 400 m long.

Attention: Proper performance cannot be guaranteed if these limits are exceeded.

Figure

The function of the ZSI

module is selected using the

2-17

rotary switch.

 

Technical data for the ZSI module

Operating voltage min. / max.

19.2V / 28.8V

 

 

Operating current min. / max.

31mA / 61mA

Automatic output reset after no more than...

3 s

Shortest time blocking signal can be present at the outputs LV

100 ms

Shortest time blocking signal can be present at the outputs MV

500 ms

Standard trip time (incl. all delays)

approx. 80 ms

 

 

Max. no. of circuit breakers connectable to ZSI IN

20

 

 

Max. no. of circuit breakers connectable to ZSI OUT

8

 

 

Max. no. of modules on one WL Circuit Breaker

1

 

 

Max. wire length for 2 x 18 AWG twisted pair

400 m

 

 

Power loss min. / max.

0.8W / 1.76W

 

 

Dimensions W / H / D

70mm /86mm / 95mm

 

 

Weight

0.223 kg

 

 

Operating temperature range

-20°C / 60°C

 

 

Table 2-22This table provides technical data for the ZSI module on the CubicleBUS.

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WL MODBUS Communication and Electronic Accessories • January 2005

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Image 42
Siemens UL1066, UL 489 specifications It trips after tZSI = 50 ms. Time saved = 250 ms, Technical data for the ZSI module
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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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