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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TDK-LAMBDA Noise Filters（Representative Standard：UL）

TDK-LAMBDA offers products Noise Filters specified by Representative Standard UL from Electrical & Controls product category. There are a total of 15 items. Parts and equipment for controlling machines and electrical systems. Controllers and power supplies. TDK-LAMBDA products are available to order through MISUMI online 24 hours a day. Free shipping, no minimum order.

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0.5

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2

3

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5

6

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15

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150
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- Single-Phase
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- DIN Rail
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Dimension depth(mm)
20

26

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35

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90

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105

128

161

170

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260
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- Screw Fastening
- Lead Wire
- Tab
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- Lug terminal
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- CE
- UL
- CUL
- TUV
- CSA
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Dimension vertical(mm)
20

22.2

23

35

42

43.4

50

50.4

51.8

52

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63

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95

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Brand	(6) (0) COSEL (14) MITSUBISHI (0) NECTOKIN (1) OMRON (1) ORIENT (2) RS Pro (0) TDK-LAMBDA (15)
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RSHN Series

TDK-LAMBDA

High-attenuation single-phase noise filter with an emphasis on diverse variations and functionality.
[Features]
・ Wiring workability is improved by SEMS screws and openable cover.
·A wide range lineup from 3 to 300 A.
・ As an option, low leakage current characteristic type and DIN rail mounting compatible type are available.
[Applications]
·Ideal for data communication, medical equipment, measuring instrument, factory automation equipment, semiconductors, railway-related equipment, LED-related equipment, and energy-related equipment.

From: ฿ 1,096.89
Days to Ship: Same day

Same day

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Compact General-Purpose Type RSEL Series

TDK-LAMBDA

A general-purpose single-phase noise filter with a wide variety of variations and an emphasis on functionality.
[Features]
- Wire type and FASTON terminal type are available in the same shape
● Low leakage current characteristics are available as an option
● Compact general-purpose type
[Applications]
● Convenient for data communications, medical equipment, measuring equipment, FA equipment, semiconductors, LED-related, and energy-related

From: ฿ 423.06
Days to Ship: Same day

Same day

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RSHN-D Series

TDK-LAMBDA

High damping type with a focus on various variations and functionality single-phase filter (DIN rail mounting type)

From: ฿ 1,143.24
Days to Ship: Same day

Same day

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RSEN Series

TDK-LAMBDA

A general-purpose single-phase noise filter that emphasizes a wide variety of variations and functionality.
[Features]
・ DIN rail mounting type.
・ Wiring workability is improved by SEMS screws and openable cover.
・ Wide lineup from 3 to 300 A.
・ As an option, low leakage current characteristic type and DIN rail mounting compatible type are available.
[Applications]
・ Convenient for data communication, medical equipment, measuring instrument, factory automation equipment, semiconductors, railway-related, LED-related, and energy-related.

From: ฿ 728.12
Days to Ship: Same day

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RSEN-D Series

TDK-LAMBDA

General purpose single-phase filter with a focus on various variations and functionality (DIN rail mounting type)

From: ฿ 907.13
Days to Ship: 5 Day(s)

5 Day(s)

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Until 31/03/2025

RSAN Series

TDK-LAMBDA

Multipurpose single-phase noise filter that is compatible with high-voltage pulses.
[Features]
·The amorphous core is used for the common mode coil magnetic core of the RSEN series, which is effective in preventing malfunctions of equipment.
・ Wiring workability is improved by SEMS screws and openable cover.
·A lineup of low-leakage current type and DIN rail mounting compatible type are available as an option.
[Applications]
·Ideal for data communication, medical equipment, measuring instrument, factory automation equipment, semiconductors, railway-related equipment, LED-related equipment, and energy-related equipment.

From: ฿ 814.74
Special Price
Days to Ship: Same day

Same day

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RTEN Series

TDK-LAMBDA

Multipurpose three-phase noise filter with a wide range of current variations.
[Features]
·A wide range lineup from 6 to 300 A.
·L1 stage with a compact, lightweight and low-profile design. Low-profile shape for limited height.
·The application of SEMS screws improves wiring workability.
·A terminal block cover is equipped for safety.
·There is an option for DIN rail mounting.
[Applications]
·Ideal for data communication, medical equipment, measuring instrument, factory automation equipment, semiconductors, railway-related equipment, LED-related equipment, and energy-related equipment.

From: ฿ 1,782.59
Days to Ship: 5 Day(s)

5 Day(s)

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RSMN series

TDK-LAMBDA

High-voltage pulse compatible, high-attenuation noise filter with an emphasis on diverse variations and functionality.
[Features]
·The amorphous core is used for the common mode coil magnetic core of the RSHN series.
·Highly effective in preventing malfunctions of equipment and current saturation. EMC filter.
・ Wiring workability is improved by SEMS screws and openable cover.
・ As an option, low leakage current characteristic type and DIN rail mounting compatible type are available.
[Applications]
·Ideal for data communication, medical equipment, measuring instrument, factory automation equipment, semiconductors, railway-related equipment, LED-related equipment, and energy-related equipment.

From: ฿ 1,128.50
Days to Ship: Same day

Same day

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RTEN-D Series

TDK-LAMBDA

Versatile three-phase filter with a wide range of current variations (DIN D rail mounting type)

From: ฿ 2,564.18
Days to Ship: Same day

Same day

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Compact And General-Purpose Type RSAL series Compatible With High Voltage Pulses

TDK-LAMBDA

Compact, general-purpose noise filter compatible with high voltage pulses.
[Features]
● Adopts an amorphous core for the common mode coil magnetic core of the RSEL series
● Effective in preventing equipment malfunction
● Wire type and lug terminal type are available in the same shape
● Low leakage current characteristics type is available as an option

From: ฿ 469.14
Days to Ship: 5 Day(s)

5 Day(s)

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Power Line EMC Filter RPE Series

TDK-LAMBDA

Single-phase filter with inlet socket type for high-frequency noise

From: ฿ 684.84
Days to Ship: Same day

Same day

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RSAN-D Series

TDK-LAMBDA

General-purpose single-phase filters compatible with high-voltage pulse.RSEN The amorphous core is adopted in the common mode coil magnetic core of the series, it is effective in preventing malfunction of equipment. (DIN rail mounting compatible type)

From: ฿ 1,138.67
Days to Ship: 5 Day(s)

5 Day(s)

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Noise Filter RTCN Series

TDK-LAMBDA

Three-phase inverter secondary side dedicated filter with a wide range of current variations.
[Features]
·A wide range lineup from 6 to 300 A.
·L1 stage with a compact, lightweight and low-profile design.
·Low-profile shape for limited height.
·The application of SEMS screws improves wiring workability.
·A terminal block cover is equipped for safety.

From: ฿ 2,970.03
Days to Ship: 5 Day(s)

5 Day(s)

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RTAN Series

TDK-LAMBDA

Three-phase external noise prevention filter (for immunity)

[Features]
· Captive assembly screws and an open/close type cover make wiring work easier
· Small and light plastic body
· Low-profile design
· Best for high-voltage pulse noise prevention
· DIN rail installation compatible type is also available

From: ฿ 4,630.23
Days to Ship: 5 Day(s)

5 Day(s)

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RSEL-M Series

TDK-LAMBDA

Compact general-purpose type (high attenuation)

[Features]
· Attenuation effect against high-voltage pulse noise
· High shielding effect
· Space saving design for simple and user friendly installation

From: ฿ 1,276.56
Days to Ship: 6 Day(s)

6 Day(s)


Brand
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	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare Until 31/03/2025	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare
Brand	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA	TDK-LAMBDA
Product Series	RSHN Series	Compact General-Purpose Type RSEL Series	RSHN-D Series	RSEN Series	RSEN-D Series	RSAN Series	RTEN Series	RSMN series	RTEN-D Series	Compact And General-Purpose Type RSAL series Compatible With High Voltage Pulses	Power Line EMC Filter RPE Series	RSAN-D Series	Noise Filter RTCN Series	RTAN Series	RSEL-M Series
CAD	2D	2D	2D	2D	2D	2D	2D	2D	2D			2D
From	฿ 1,096.89	฿ 423.06	฿ 1,143.24	฿ 728.12	฿ 907.13	฿ 814.74 Special Price On Sale Until 31/03/2025	฿ 1,782.59	฿ 1,128.50	฿ 2,564.18	฿ 469.14	฿ 684.84	฿ 1,138.67	฿ 2,970.03	฿ 4,630.23	฿ 1,276.56
Days to Ship	Same day	Same day	Same day	Same day	5 Day(s)	Same day	5 Day(s)	Same day	Same day	5 Day(s)	Same day	5 Day(s)	5 Day(s)	5 Day(s)	6 Day(s)
Rated Current(A)	3 ～ 60	0.5 ～ 6	3 ～ 20	3 ～ 60	3 ～ 10	3 ～ 60	6 ～ 150	3 ～ 50	6 ～ 30	0.5 ～ 6	6	10	30	6 ～ 30	1
Circuit Configuration	Single-Phase	Single-Phase	Single-Phase	Single-Phase	Single-Phase	Single-Phase	Three-Phase	Single-Phase	Three-Phase	Single-Phase	-	Single-Phase	Three-Phase	Three-Phase	Single-Phase
Mounting Method	Fasten With Screws / DIN rail/Screw retention	Fasten With Screws	DIN rail/Screw retention	Fasten With Screws / DIN rail/Screw retention	DIN rail/Screw retention	Fasten With Screws / DIN rail/Screw retention	Fasten With Screws	DIN Rail / Fasten With Screws / DIN rail/Screw retention	DIN rail/Screw retention	Fasten With Screws	Fasten With Screws	DIN rail/Screw retention	Fasten With Screws	Fasten With Screws / DIN rail/Screw retention	Fasten With Screws
Dimension depth(mm)	52 ～ 100	50	52	35 ～ 90	52	35 ～ 90	63 ～ 190	35 ～ 100	63 ～ 70	20	58.8	52	70	63 ～ 70	32
Wiring Method	Screw Fastening	Lead Wire / Lug terminal	Screw Fastening	Screw Fastening	Screw Fastening	Screw Fastening	Screw Fastening	Screw Fastening	Screw Fastening	Lead Wire / Lug terminal	-	Screw Fastening	Screw Fastening	Screw Fastening	Lead Wire
Representative Standard	UL	UL	UL	UL	UL	UL	UL	UL	UL	UL	UL	UL	UL	UL	UL
Dimension vertical(mm)	35 ～ 60	20	35	35 ～ 54	35	35 ～ 54	42 ～ 88	35 ～ 60	42	50	22.2	35	42	42 ～ 50.4	23
Dimension width(mm)	98 ～ 272	45	98 ～ 127	87 ～ 170	87	87 ～ 170	120 ～ 290	98 ～ 272	120 ～ 140	45	50	87	140	120 ～ 140	68

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.