What is a noise filter and why is it important in electronic systems?

A noise filter is a device designed to remove high-frequency noise from power and signal lines in electronic systems. It is crucial for preventing interference and ensuring the proper functioning of electronic devices by eliminating noise that can cause malfunctions and communication errors in connected equipment. Noise filters help maintain the integrity of signals and improve the reliability and longevity of electronic systems.

What types of noise do noise filters remove?

Noise filters are effective in removing various types of noise, including conduction noise, induction noise, and radiated noise. Conduction noise travels along power and signal lines, while induction noise is caused by electromagnetic interference from nearby devices. Radiated noise is emitted as electromagnetic waves and can affect nearby electronic components. Noise filters block or attenuate these unwanted signals, reducing their impact on system performance.

How does a noise filter work?

Noise filters operate using the principle of a low-pass filter, which allows low-frequency signals to pass through while blocking high-frequency noise. They incorporate components such as inductors, capacitors, and resistors to create impedance paths for high-frequency noise, effectively reducing or eliminating it from the power or signal lines. The filtered noise is either dissipated as heat or redirected to ground.

What are the main types of noise filters available?

The main types of noise filters include single-phase filters, three-phase filters, and common-mode filters. Single-phase filters are used for standard AC power lines, while three-phase filters are designed for industrial applications with three-phase power systems. Common-mode filters target common-mode noise that appears on multiple lines simultaneously. Each type is selected based on the specific requirements of the application.

How do I choose the right noise filter for my application?

To choose the right noise filter, consider factors such as the type of noise to be filtered, the power requirements, the voltage and current ratings, and the environmental conditions of the application. Assess the noise characteristics and determine whether you need single-phase, three-phase, or common-mode filtering. Ensure that the filter’s rated current and voltage match your system’s specifications and that it is suitable for the operating environment.

What are the benefits of using noise filters in industrial applications?

Noise filters offer several benefits in industrial applications, including improved equipment reliability, reduced electromagnetic interference (EMI), enhanced signal integrity, and compliance with regulatory standards for electromagnetic compatibility (EMC). They help prevent malfunctions and data errors caused by electrical noise, leading to increased uptime and reduced maintenance costs. Noise filters also contribute to a safer and more efficient operating environment.

How does a noise filter differ from a surge protector?

A noise filter is designed to block or attenuate high-frequency noise from power and signal lines, while a surge protector protects electronic equipment from voltage spikes and surges. Noise filters focus on maintaining signal integrity by reducing interference, whereas surge protectors safeguard against sudden increases in voltage that can damage components. Both devices can be used together to provide comprehensive protection for electronic systems.

What are the common applications of noise filters?

Noise filters are commonly used in various applications, including data communication systems, medical equipment, industrial automation, power supplies, and audio-visual equipment. They are essential in environments with high levels of electromagnetic interference, such as factories, hospitals, and data centers, where they help ensure the reliable operation of sensitive electronic devices.

How do I install a noise filter?

Installation of a noise filter typically involves connecting it in series with the power or signal lines that require filtering. For single-phase filters, connect the input and output terminals to the corresponding lines, ensuring proper grounding to dissipate noise. Three-phase filters are installed similarly but require connections to all three phases. Follow the manufacturer’s instructions for mounting and wiring, and ensure that the filter’s ratings match the system requirements.

Can noise filters be used in both AC and DC systems?

Yes, noise filters can be used in both AC and DC systems, but the type of filter used will vary depending on the application. AC noise filters are designed for alternating current applications and are commonly used to filter noise from AC power lines. DC noise filters are used in direct current systems and are typically used to filter noise from DC power supplies and signal lines. Select the appropriate filter type based on your system’s power source.

What are the differences between single-phase and three-phase noise filters?

Single-phase noise filters are designed for use with single-phase power systems and are commonly used in residential and commercial applications. They typically have two or three connections: live, neutral, and sometimes ground. Three-phase noise filters are used in industrial applications with three-phase power systems and have connections for all three phases (L1, L2, L3) and often ground. Three-phase filters are suitable for higher power applications and provide more comprehensive noise suppression.

How do I determine the correct rated current for a noise filter?

To determine the correct rated current for a noise filter, calculate the total current that will flow through the filter under normal operating conditions. This includes the current drawn by all connected devices. Select a noise filter with a rated current that meets or exceeds this value to ensure it can handle the load without overheating or reducing its effectiveness. It is also advisable to allow for a safety margin to accommodate potential increases in load.

What is the role of a common-mode noise filter?

A common-mode noise filter is designed to reduce or eliminate common-mode noise, which is noise that appears equally on multiple lines relative to a common ground. These filters are particularly effective in applications where noise affects all conductors simultaneously, such as in data communication lines and power supply systems. Common-mode noise filters help improve signal integrity and reduce interference with nearby electronic equipment.

What maintenance is required for noise filters?

Noise filters require minimal maintenance, but regular inspections are recommended to ensure they are functioning correctly. Check for any signs of physical damage, overheating, or loose connections. Ensure that the grounding is intact and effective. Periodically test the filter’s performance to verify that it is still effectively attenuating noise. If any issues are detected, replace the filter to maintain system performance and reliability.

How can noise filters contribute to EMC compliance?

Noise filters help achieve electromagnetic compatibility (EMC) by reducing the emission of high-frequency noise and preventing interference with other electronic devices. They help electronic systems meet regulatory standards for conducted and radiated emissions, ensuring that equipment can operate without causing or being affected by electromagnetic interference. Using noise filters is a critical step in designing compliant systems that function reliably in various electromagnetic environments.

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OMRON Noise Filters（Representative Standard：CSA）

OMRON offers products Noise Filters specified by Representative Standard CSA from Electrical & Controls product category. There are a total of 1 items. Parts and equipment for controlling machines and electrical systems. Controllers and power supplies. OMRON products are available to order through MISUMI online 24 hours a day. Free shipping, no minimum order.

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Rated Current(A)
0.5

1

2

3

4

5

6

10

15

16

20

30

40

50

60

80

100

150
Clear

Circuit Configuration
- Single-Phase
- Three-Phase
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Mounting Method
- DIN Rail
- Fasten With Screws
- DIN rail/Screw retention
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Dimension depth(mm)
20

26

30

32

35

37

38

39

40

41

42

43

43.4

44

48

50

50.4

52

54

55

58.8

63

64

70

71

90

95

100

105

128

161

170

190

210

260
Drawing

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- Screw Fastening
- Lead Wire
- Tab
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- Lug terminal
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- UL
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- CSA
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20

22.2

23

35

42

43.4

50

50.4

51.8

52

54

55

60

63

68

70

85

88

90

92

94.7

95

104

105

117

118

128

130

132

170

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240

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400
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30

32

39

45

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52

53

63

66

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87

90

90.5

94.5

98

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127

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170

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267

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290

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430
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Until 31/03/2025

Noise Filter S8V-NF

OMRON

DIN rail-mounted type that is ideal for control panels. Slim type that conserves space. Push-in connection for safe and easy wiring
"ValueDesign "Compatible Product

[Features]
· Easily equipped: Can be mounted to a DIN rail with a single action
· Conserves space: Shape is slimmer than conventional noise filters
· Reduction of risk of electric shock: Conductive parts are not exposed, so protective terminal covers are unnecessary

From: ฿ 3,171.00
Special Price
Days to Ship: Same day

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	You can add up to 6 items per a category to the compare list.Compare Until 31/03/2025
Brand	OMRON
Product Series	Noise Filter S8V-NF
From	฿ 3,171.00 Special Price On Sale Until 31/03/2025
Days to Ship	Same day
Rated Current(A)	3 ～ 6
Circuit Configuration	Single-Phase
Mounting Method	-
Dimension depth(mm)	90
Wiring Method	-
Representative Standard	CSA
Dimension vertical(mm)	94.7
Dimension width(mm)	32

Related Categories to Noise Filters

- Noise Filters

FAQ Noise Filters

Question: What is a noise filter and why is it important in electronic systems?: Answer: A noise filter is a device designed to remove high-frequency noise from power and signal lines in electronic systems. It is crucial for preventing interference and ensuring the proper functioning of electronic devices by eliminating noise that can cause malfunctions and communication errors in connected equipment. Noise filters help maintain the integrity of signals and improve the reliability and longevity of electronic systems.
Question: What types of noise do noise filters remove?: Answer: Noise filters are effective in removing various types of noise, including conduction noise, induction noise, and radiated noise. Conduction noise travels along power and signal lines, while induction noise is caused by electromagnetic interference from nearby devices. Radiated noise is emitted as electromagnetic waves and can affect nearby electronic components. Noise filters block or attenuate these unwanted signals, reducing their impact on system performance.
Question: How does a noise filter work?: Answer: Noise filters operate using the principle of a low-pass filter, which allows low-frequency signals to pass through while blocking high-frequency noise. They incorporate components such as inductors, capacitors, and resistors to create impedance paths for high-frequency noise, effectively reducing or eliminating it from the power or signal lines. The filtered noise is either dissipated as heat or redirected to ground.
Question: What are the main types of noise filters available?: Answer: The main types of noise filters include single-phase filters, three-phase filters, and common-mode filters. Single-phase filters are used for standard AC power lines, while three-phase filters are designed for industrial applications with three-phase power systems. Common-mode filters target common-mode noise that appears on multiple lines simultaneously. Each type is selected based on the specific requirements of the application.
Question: How do I choose the right noise filter for my application?: Answer: To choose the right noise filter, consider factors such as the type of noise to be filtered, the power requirements, the voltage and current ratings, and the environmental conditions of the application. Assess the noise characteristics and determine whether you need single-phase, three-phase, or common-mode filtering. Ensure that the filter’s rated current and voltage match your system’s specifications and that it is suitable for the operating environment.
Question: What are the benefits of using noise filters in industrial applications?: Answer: Noise filters offer several benefits in industrial applications, including improved equipment reliability, reduced electromagnetic interference (EMI), enhanced signal integrity, and compliance with regulatory standards for electromagnetic compatibility (EMC). They help prevent malfunctions and data errors caused by electrical noise, leading to increased uptime and reduced maintenance costs. Noise filters also contribute to a safer and more efficient operating environment.
Question: How does a noise filter differ from a surge protector?: Answer: A noise filter is designed to block or attenuate high-frequency noise from power and signal lines, while a surge protector protects electronic equipment from voltage spikes and surges. Noise filters focus on maintaining signal integrity by reducing interference, whereas surge protectors safeguard against sudden increases in voltage that can damage components. Both devices can be used together to provide comprehensive protection for electronic systems.
Question: What are the common applications of noise filters?: Answer: Noise filters are commonly used in various applications, including data communication systems, medical equipment, industrial automation, power supplies, and audio-visual equipment. They are essential in environments with high levels of electromagnetic interference, such as factories, hospitals, and data centers, where they help ensure the reliable operation of sensitive electronic devices.
Question: How do I install a noise filter?: Answer: Installation of a noise filter typically involves connecting it in series with the power or signal lines that require filtering. For single-phase filters, connect the input and output terminals to the corresponding lines, ensuring proper grounding to dissipate noise. Three-phase filters are installed similarly but require connections to all three phases. Follow the manufacturer’s instructions for mounting and wiring, and ensure that the filter’s ratings match the system requirements.
Question: Can noise filters be used in both AC and DC systems?: Answer: Yes, noise filters can be used in both AC and DC systems, but the type of filter used will vary depending on the application. AC noise filters are designed for alternating current applications and are commonly used to filter noise from AC power lines. DC noise filters are used in direct current systems and are typically used to filter noise from DC power supplies and signal lines. Select the appropriate filter type based on your system’s power source.
Question: What are the differences between single-phase and three-phase noise filters?: Answer: Single-phase noise filters are designed for use with single-phase power systems and are commonly used in residential and commercial applications. They typically have two or three connections: live, neutral, and sometimes ground. Three-phase noise filters are used in industrial applications with three-phase power systems and have connections for all three phases (L1, L2, L3) and often ground. Three-phase filters are suitable for higher power applications and provide more comprehensive noise suppression.
Question: How do I determine the correct rated current for a noise filter?: Answer: To determine the correct rated current for a noise filter, calculate the total current that will flow through the filter under normal operating conditions. This includes the current drawn by all connected devices. Select a noise filter with a rated current that meets or exceeds this value to ensure it can handle the load without overheating or reducing its effectiveness. It is also advisable to allow for a safety margin to accommodate potential increases in load.
Question: What is the role of a common-mode noise filter?: Answer: A common-mode noise filter is designed to reduce or eliminate common-mode noise, which is noise that appears equally on multiple lines relative to a common ground. These filters are particularly effective in applications where noise affects all conductors simultaneously, such as in data communication lines and power supply systems. Common-mode noise filters help improve signal integrity and reduce interference with nearby electronic equipment.
Question: What maintenance is required for noise filters?: Answer: Noise filters require minimal maintenance, but regular inspections are recommended to ensure they are functioning correctly. Check for any signs of physical damage, overheating, or loose connections. Ensure that the grounding is intact and effective. Periodically test the filter’s performance to verify that it is still effectively attenuating noise. If any issues are detected, replace the filter to maintain system performance and reliability.
Question: How can noise filters contribute to EMC compliance?: Answer: Noise filters help achieve electromagnetic compatibility (EMC) by reducing the emission of high-frequency noise and preventing interference with other electronic devices. They help electronic systems meet regulatory standards for conducted and radiated emissions, ensuring that equipment can operate without causing or being affected by electromagnetic interference. Using noise filters is a critical step in designing compliant systems that function reliably in various electromagnetic environments.