Communication-capable Circuit Breakers

WL Circuit Breaker

Functional overview of the trip unit system

Basic Functions

ETU748

ETU755

ETU776

In

 

Long-time overcurrent protection

 

Function can be switched ON/OFF

 

Setting range IR = In x …

0.4, 0.45, 0.5, 0.55,

0.4 … 1 (step: 1A)

0.4 … 1 (step: 1A)

 

 

0.6, 0.65, 0.7, 0.8,

 

 

 

 

0.9, 1

 

 

 

Switch-selectable overload protection

 

 

 

L

(I2t or I4t dependent function)

(via communications)

 

Setting range of time delay class tR at I2t

 

 

 

 

(seconds)

2, 3.5, 5.5, 8, 10,

2 … 30 (step: 0.1s)

2 … 30 (step: 0.1s)

 

Setting range of time delay tR at I4t

14, 17, 21, 25, 30

 

 

 

 

 

 

 

(seconds)

1, 2, 3, 4, 5

1 … 5 (step: 0.1s)

1 … 5 (step: 0.1s)

 

Thermal memory

(via slide switch)

(on/off via communications)

(on/off via key pad

 

 

 

 

or communications)

 

Phase loss sensitivity

at tsd=20ms (M)

(on/off via communications)

(on/off via key pad

 

 

 

 

or communications)

 

Neutral protection

N

Function can be switched ON/OFF

(via communications)

(via key pad or communications)

 

N-conductor setting range IN = In x …

0.5, 1, OFF

0.5, 1, OFF

0.5 … 2, OFF

 

Short-time delayed overcurrent protection

 

Function can be switched ON/OFF

(via communications)

(via key pad or communications)

 

Setting range Isd = In x …

1.25, 1.5, 2, 2.5,

1.25 … 0.8 x Icw = max

1.25 … 0.8 x Icw = max

 

 

3, 4, 6, 8, 10, 12

(step: 10A)

(step: 10A)

S

Setting range of time delay tsd, fixed

 

 

 

(seconds)

M, 0.1, 0.2, 0.3, 0.4

M, 0.08 …0.4, OFF (step: 0.001s)

M, 0.08 …0.4, OFF (step: 0.001s)

 

Switch-selectable short -time delay

 

 

 

 

short-circuit protection

 

 

 

 

(I2t dependent function)

(via rotary switch)

(via communications)

(via key pad or communications)

 

Setting range of time delay tsd at I2t

 

 

 

 

(seconds)

0.1, 0.2, 0.3, 0.4

0.1 … 0.4 (step: 0.001s)

0.1 … 0.4 (step: 0.001s)

 

Zone Selective Interlocking (ZSI) function

per CubicleBUS module

per CubicleBUS module

per CubicleBUS module

 

Instantaneous overcurrent protection

 

Function can be switched ON/OFF,

 

 

 

IExtended Instantaneous Protection

is enabled when OFF

 

 

 

 

(via communications)

 

(via key pad or communications)

Setting range I

i

= I

n

x …

I

i

= I

cw

= EIP 1

1.5 x I

n

… 0.8 x I

cs

= max, OFF=I =EIP

1

1.5 x I

n

… 0.8 x I

cs

= max, OFF=I =EIP

 

 

 

 

 

 

 

 

cw

 

 

 

cw

Ground fault protection 2

O (field installable module)

O (field installable module)

 

O (field installable module)

Trip and alarm function

 

 

 

 

(via communications)

 

(via key pad or communications)

Detection of the ground fault current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by residual summing method

 

 

 

 

 

 

 

 

 

 

 

 

 

Detection of the ground fault current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by direct sensing method

 

 

 

 

 

 

 

 

 

 

 

 

 

Setting range of the Ig for trip

A, B, C, D, E

A … E (step: 1A)

 

A … E (step: 1A)

G Setting range of the Ig for alarm

A, B, C, D, E

A … E (step: 1A)-

 

A … E (step: 1A)

Setting range of the time delay tg

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(seconds)

 

 

 

 

0.1, 0.2, 0.3, 0.4, 0.5

0.1 … 0.5 (step: 0.001s)

 

0.1 … 0.5 (step: 0.001s)

Switch-selectable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ground fault protection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(I2t / fixed)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Setting range time delay tg at I2t

0.1, 0.2, 0.3, 0.4, 0.5

0.1 … 0.5 (step: 0.001s)

 

0.1 … 0.5 (step: 0.001s)

ZSI ground function

 

per CubicleBUS module

per CubicleBUS module

 

per CubicleBUS module

1 Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating of

available

 

 

the breaker with minus 0% tolerance; that means no instantaneous override whatsoever. EIP further

not available

 

enables the circuit breaker to be applied up to the full instantaneous rating of the breaker on systems

 

O

optional

 

 

where the available fault current exceeds the withstand rating.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2Ground Fault Module cannot be removed after installation.

Notes:

M = Indicates phase loss sensitivity is enabled. LT pickup reduced 80% when phase unbalance > 50%. ST delay = 20ms Communications = Setting the parameters of the trip unit via the Breaker Data Adapter, MODBUS, or PROFIBUS

Key pad = Direct input at the trip unit

2/5

WL MODBUS Communication and Electronic Accessories • January 2005

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Siemens UL1066, UL 489 specifications Basic Functions ETU748 ETU755 ETU776

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.