RT8121-25-17M3

**DATA** SHEET **EMC / RFI Ch okes RT Series N** 

## **Current-Compensated Chokes - Nanocrystalline Core** 

## Rated currents from 25 to 85 A 

Approvals & Compliances ee 

Up to 600 VAC and VDC 

2- and 3-wire configurations 

Horizontal and vertical PCB mounting types Ruggedized saturation and thermal behavior Open construction for forced and convection cooling 

Straightforward pin-out for easy PCB design Nanocrystalline core for high performance at 10 kHz 

RT common-mode chokes are mainly used to filter EMI noise on AC power lines up to 600 VAC. EMI noise of electronic equipment can go to the power lines and disturb the proper function of other devices like communication devices or control logic of robotics. Thus noise generated by the equipment from switched power electronics or by high slew rates of controllers needs to be filtered. RT common-mode chokes are used to suppress EMI noise in PCB integrated filter designs with line bypass capacitors or in combination with single phase filters for extra low leakage filter designs. 

## **Features and Benefits** 

## Performance indicators 

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nduct ce va e [m<br>17.3<br>Rated current [A]<br>25 85<br>**----- End of picture text -----**<br>


Cost-effective PCB designs for up to 135 A with forced cooling 

EIS (electrical insulation system E332676) acc. to UL 1446 

Compact size and light weight Low magnetic leakage flux Standardized foot print Broad range of inductance ratings Custom-specific versions on request 

## **Typical Applications** 

## **Technical Specifications** 

**Rated currents Operating frequency Creepage and clearance distances** 

**High potential test voltage** 

**Rated inductance Operating voltage Overvoltage category Pollution degree Stray inductance** 

**Temperature range (operation and storage) Climatic category Altitude Flammability corresponding to Vibration and shock** 

**Design c orresponding to** 

**MTBF (Mil-HB- 217F)** 

25 to 85 A @ 60°C DC to 400 Hz 

Creepage & Clearance (2-line): ≥ 3.5 mm (Coil - Coil) / ≥ 3.0 mm (Coil-Core) Creepage & Clearance (3-line): ≥ 6.3 mm (Coil - Coil) / ≥ 5.5 mm (Coil-Core) 

3 kV AC 3s (coil to coil) Repetition with max. 80% of the HV test voltage 

1.8 to 17 mH 

300 VAC / 450 VDC (2line) 600 VAC (3-line) III (acc. IEC 60664-1) PD2 (acc. IEC60664-1) 

Max. 0.1% of rated inductance (@ 10 kHz 1 V, 0 A) -40°C to +125°C 

40/125/56 (acc. IEC 60068-1) 2'000 m, current and voltage derating above UL 94 V0 

Vibration: 10 Hz to 55 Hz (24 cycles, according IEC 60938-1) Shock: 30 g / 18 ms (3 cycles, according IEC 60938-1) 3M4 (according IEC 60721-3-3) UL/IEC 60938-1/-2 UL1446 

2,000,000 h @ 60°C/300 V 

AC and DC filtering for midsize power range drives, photovoltaic inverters, fast chargers, EV charging stations, heat pumps, UPS and switch mode power supplies Filter with low leakage current noise or improved immunity against grid disturbances Electronic devices, automation and (industrial) LED lighting Communication devices Medical and laboratory equipment Converters 

Typical electrical schematic ~~ee~~ 

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**DATA** •• SHEET 06. Jun 2025 

2 EMC / RFI Chokes 

## **RT Series - Nanocrystalline Core** 

||**Convection cooling**<br>**nominal**|**3 m/s nominal**<br>* Forced Cooling|**** Inductance**<br>**Ln @ 25˚C**|**Inductance**<br>**Ln@25˚C**|**Inductance**<br>**Ln@25˚C**|**@ 25˚C**<br>**Inductance**<br>Resistance|±0.1<br>***Ø Pin|**Weight**|
|---|---|---|---|---|---|---|---|---|
||**Current @ 60˚C**|**Current @ 60˚C**|**10kHz**|**100kHz**|||||
||[A]|[A]|[mH/path]|[mH/path]||[m /path]|ØP [mm]|[g]|
|Horizontal 2-line|||||||||
|RT8121-25-17M3|25|45|17.3||2.7|4.6|2.2|160|
|RT8121-32-12M8|32|51|12.8||2.9|3.4|2.4|220|
|RT8121-40-10M1|40|64|10.1||2.3|2.2|2.8|230|
|RT8121-50-8M6|50|80|8.6||1.9|1.7|2x2.2|280|
|RT8121-63-4M4|63|100|4.4||1|1.1|2x2.2|270|
|RT8121-85-3M2|85|135|3.2||0.5|0.6|2x3.0|370|
|tical 2-line|||||||||
|RT8521-25-17M3|25|45|17.3||2.7|4.6|2.2|160|
|RT8521-32-12M8|32|51|12.8||2.9|3.5|2.4|230|
|RT8521-40-10M1|40|64|10.1||2.3|2.3|2.8|240|
|RT8521-50-8M6|50|80|8.6||1.9|1.7|2x2.2|300|
|RT8521-63-4M4|63|100|4.4||1|1|2x2.2|290|
|RT8521-85-3M2|85|135|3.2||0.5|0.7|2x3.0|390|
|Horizontal 3-line|||||||||
|RT8131-25-12M8|25|45|12.8||2.9|3.5|2.4|260|
|RT8131-32-10M1|32|51|10.1||2.3|2.5|2.4|260|
|RT8131-40-6M3|40|64|6.3||1.4|1.9|2x1.9|290|
|RT8131-50-4M4|50|80|4.4||1|1.2|2x2.2|300|
|RT8131-63-2M8|63|100|2.8||0.6|0.7|2x2.6|320|
|RT8131-85-1M8|85|135|1.8||0.28|0.5|2x3.0|380|
|tical 3-line|||||||||
|RT8531-25-12M8|25|45|12.8||2.9|3.5|2.4|260|
|RT8531-32-10M1|32|51|10.1||2.3|2.5|2.4|260|
|RT8531-40-6M3|40|64|6.3||1.4|1.9|2x1.9|290|
|RT8531-50-4M4|50|80|4.4||1|1.2|2x2.2|300|
|RT8531-63-2M8|63|100|2.8||0.6|0.8|2x2.6|320|
|RT8531-85-1M8|85|135|1.8||0.28|0.5|2x3.0|390|



Test conditions: Inductance tolerance: +50%, –30%; Resistance tolerance: +15% @ 25°C; Electrical characteristics @ 25°C: ±2°C 

* Typical current for forced cooling with 3 m/s. Due to the possible turbulences and degradation of the air stream within an equipment please consider thermal validation. 

** Typical stray inductance, max is 0.1% of Ln. 

- *** Length of pin (dimension P) is always 5.5 mm ± 1 mm. 

**Schaffner Group DATA** SHEET 06. Jun 2025 

3 EMC / RFI Chokes 

## Product selector 

RT8xxx-xx-xMx 

Inductance value (e.g. 1M2 = 1.2mH) Nominal input current [A] 1: nanocrystalline core 2: ferrite core 2: 2–line choke 3: 3–line choke 1: Horizontal 5: Vertical 

RT: Schaffner standard ring core choke series “RT” 

Examples: RT8121-32-12M8: Horizontal 2-line choke for 32 A, with 12.8 mH RT8531-50-4M4: Vertical 3-line choke for 50 A, with 4.4 mH 

## **Distribution Inventory** 

Up-to-date inventory levels for global distributors is available at 

https://products.schaffner.com/stock 

**Schaffner Group DATA** SHEET 06. Jun 2025 

4 EMC / RFI Chokes 

## **Typical Choke Attenuation And Impedance - 2-Line Versions** 

Per CISPR 17; 50 ˜/50 ˜ as ym 

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RT8x21-25-17M3 RT8x21-32-12M8 RT8x21-40-10M1<br>dB<br>35 TTJAINUILo” =«* [San nee a8 Oy<br>30 we \ AM eT TIN aING<br>25 m0yaa a a\ *° a art XSS *° a railAeES<br>20 AR Ne\ eT A \ TyDzatll<br>15 a a INGNt sc00 ana ee "000 TMa a<br>nN i K<br>10 en Sn | CI LM<br>5 a oo IE ETE ETT a<br>0 a ro} |g  L_LILIMIMLTT ELH aSn ee<br>10k 100k 1M 10M 10k 100k 1M 10M Hz 10k 100k 1M 10M<br>RT8x21-50-8M6 RT 8x21-63-4M4 RT8x21-85-3M2<br>dB Ohm dB Ohm dB<br>35<br>30<br>Ae7 e pealeI LT.IN =”257 AIM| p=atlaanrT\ = 25 SMITHMEERa Pik<br>"Ta20 TIE TIN | a at XN 20 TTA Perm<br>val \ 1000 20 Pe 4 1000 pe 7<br>15<br>an a 0 | a<br>eyTe a |Za 105 atati SHae<br>S01 0 2<br>° a a a 10k 100k 1M 10M<br>**----- End of picture text -----**<br>


## **Typical Choke Attenuation And Impedance - 3-Line Versions** 

Per CISPR 17; 50 ˜/50 ˜ as ym 

RT8x31-25-12M8 

RT8x31-32-10M1 

RT8x31-40-6M3 

RT8x31-50-4M4 

RT8x31-63-2M8 

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RT8x31-85-1M8<br>dB35 TOL<br>30 a<br>eepe osee nNeeee 2520 aa eea Eenie TTI<br>Ne 1000 15 aeeeie<br>TI CATMIT 10 a<br>CEC 5 wail AE<br>0 a<br>10k 100k 1M 10M<br>**----- End of picture text -----**<br>


> 5 | EMC / RFI Chokes | **Schaffner Group DATA** SHEET 06. Jun 2025 

## **Mechanical Data: Horizontal Chokes** 

All dimensions in mm; 1 inch = 25.4 mm Tolerances according: ISO 2768-m/EN 22768-m 

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Horizontal 2-line chokes<br>2D<br>a<br>a<br>¢ accaaeN —<br>g 3 as San \ C\ ~ is<br>L@°OCOOULUSS2),—] ry e+ \| — ||<br>"\GUFOOTOOUS, \<br>NN<br>\ recommended screw for fixation: U<br>WNfomenngightening1452 K36torqueiors x8 1.0 Nm<br>mark ;<br>indicates PIN<br>MAX COMPONENT<br>VOLUME \<br>| |Tai | mn) i|<br>! — 1 = eo<br>| t il L<br>/ 85A)<br> 40A)<br>**----- End of picture text -----**<br>


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Horizontal 3-line chokes<br>aD ZA =itA<br>(tr TR<br>Vacunmw/ foe | ( _ <<br>of ¢ eCvid OSOORO008N)) j eav\ LeI<br>1 [pOC IODC Ay! NS<br>SSID NOSE OK<br>NOOO Ne’, & mark indicates PIN no.<br>SEBEREDEX3Son t \<br>Ny 72 er, \, \\ recommended screw for ÿxation: WN 1452 K35 x 8<br>tightening torque 1.0 Nm<br>VOLUMEMAX COMPONENT \<br>Ta | | {|<br>=r | i HH<br>pH | | | LI]|<br>mailyf ——— oo —l l —+Ta<br>øP (40A / 50A / 63A / 85A)<br>ø<br>**----- End of picture text -----**<br>


## **Dimensions** 

|**Dimensions**||||||||
|---|---|---|---|---|---|---|---|
||**øD**|**Н**|**G**|**øЕ**|**f**|**g**|**L**|
||±0.2|(max)|±0.1|±0.2|±1°|±1°|±0.5|
|2-Line Chokes||||||||
|RT8121-25-17M3|56|34|0.6|49|15°||5|
|RT8121-32-12M8, RT8121-40-10M1|62|37|0.6|55.4|15°||5|
|RT8121-50-8M6, RT8121-63-4M4|66|41|0.6|59.8|12°|22°|5|
|RT8121-85-3M2|73.5|47|0.6|64.8|12°|22°|5|
|3-Line Chokes||||||||
|RT8131-25-12M8, RT8131-32-10M1|62|38|0.6|55.4|15°||5|
|RT8131-40-6M3, RT8131-50-4M4, RT8131-63-2M8|66|42|0.6|59.8|12°|22°|5|
|RT8131-85-1M8|73.5|46|0.6|64.8|12°|22°|5|



**Schaffner Group DATA** SHEET 06. Jun 2025 

6 EMC / RFI Chokes 

## **Mechanical Data: Vertical Chokes** 

All dimensions in mm; 1 inch = 25.4 mm Tolerances according: ISO 2768-m/EN 22768-m 

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Vertical 2-line chokes<br>Mo P 7 C=<br>Le Q | \ —— mark<br>w for fixation:<br>\__WN 1452 K35 x 8<br>VOLUMEMAX COMPONENT__ tightening torque 1.0 Nm<br>a po<br>mae! SN (AX Y INV] | | (\ , Cw<br>! rt ot aT ! tr Sa<br>øP (50A / 6 | øP (25A / 32A / 40A)<br>**----- End of picture text -----**<br>


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Vertical 3-line chokes<br>L<br>P<br>O Sl<br>M S<br>T<br>N<br>  5   3  1<br>a _oh__as 4 [\] _<br>  6   4   2<br>mark indic       ates PIN no. 1<br>Q \<br>recommended screw for fixation:recommendad screw for fixation:<br>MA             X COMPONENT \\ W             N 1452 K             35 x 8<br>V             OLUME tightening torqu  e    1   .0 Nm<br>W e  Iy/ / \ ae ]/ \<br>t e ] eR J (YL tu Ix (h <| LL<br>HiLCshRUA LAS ny<br>oe or<br>P              (25A / 32A             )<br>øP (40A / 50A / 63A / 85A)<br>B            C            D<br>ax<br>m<br>H<br>G<br>R<br>**----- End of picture text -----**<br>


## **Dimensions** 

|||**L**|**В**|**H**|**G**|**C**|**D**|**M**|**N**|**O**|**P**|**Q**|**S**|**T**|**R**|
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|||±0.2|±0.2|(max)|±0.1|±0.4|±0.2|±0.1|±0.4|±0.4|±0.4|±0,4|±0.4|±0.2|±0.5|
|2~~-~~Line Chokes<br>2~~-~~Line Chokes||||||||||||||||
|RT8521~~-~~25~~-~~17M3<br>RT8521~~-~~2~~5-~~17M3||55|36|55|0.6|30|12|4|||47|46|||5|
|RT8521~~-~~32~~-~~12M8, RT8521~~-~~40~~-~~10M1<br>RT8521~~-~~32~~-~~12M8, RT8521~~-~~40~~-~~10M1||60|38|60|0.6|32|12|4|||52|46|||5|
|RT8521~~-~~50~~-~~8M6, RT8521~~-~~63~~-~~4M4<br>RT8521~~-~~S0~~-~~8M6, RT8521~~-~~6~~3-~~4M4||64|42|64|0.6|36|18|4|5|51|56|56|||5|
|RT8521~~-~~85~~-~~3M2<br>RT8521 ~~-~~8~~5-~~3M2||71|46|70|0.6|40|18|4.5|6|56|62|56|||5|
|3~~-~~Line Chokes<br>3~~-~~Line Chokes||||||||||||||||
|RT8531~~-~~25~~-~~12M8, RT8531~~-~~32~~-~~10M1<br>RT8531~~-~~25~~-~~12M8, RT8531~~-~~32~~-~~10M1||60|38|63|0.6|32|12|4|||52|46||26|5|
|RT8531~~-~~40~~-~~6M3, RT8531~~-~~50~~-~~4M4,<br>RT8531~~-~~40~~-~~6M3, RT8531~~-~~50~~-~~4M4,||64|42|67|0.6|36|18|4|5|51|56|56|30.5|25.5|5|
|RT8531~~-~~63~~-~~2M8<br>RT8531~~-~~6~~3-~~2M8||||||||||||||||
|RT8531~~-~~85~~-~~1M8<br>RT8531~~-~~8~~5-~~1M8||71|46|74|0.6|40|18|4.5|6|56|62|56|28|34|5|



> 7 | EMC / RFI Chokes | **Schaffner Group DATA** SHEET 06. Jun 2025 **Soldering Profile** 

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While TE has made every reasonable effort to ensure the accuracy of the information in this document, TE does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee that the information is accurate, correct, reliable or current. TE reserves the right to make any changes to the information contained herein without prior notice. TE Connectivity assumes only those obligations set forth in the terms and conditions for this product and shall in no event be liable for any incidental, indirect, or consequential damages arising out of the sale, resale, use, or misapplication of the product. TE expressly disclaims any implied warranties with respect to the information contained herein, including, but not limited to, implied warranties of merchantability or fitness for a particular purpose. Dimensions, specifications and/ or information contained herein are for reference purposes only and are subject to change without notice. Consult TE for the latest dimensions, specifications and/or information. Users of TE Connectivity products must make their own assessment as to whether the respective product is suitable for the respective desired application. 

ED 06/25