TOF 15-12S

AC/DC Open Frame Power Supply (PSU), ITE, 1 Output, 15 W, 85V AC to 264V AC, Fixed

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: TRACO POWER
Product type: AC / DC Open Frame Power Supplies
No. of Outputs:1 Output; Power Rating (Covection Cooling):15W; Power Rating (Forced Cooling):-; Input Voltage VAC:85V AC to 264V AC; Power Supply Output Type:Fixed; Output Voltage - Output 1:12V
SVHC: No SVHC (16-Jul-2019)
Product Range: TOF Series
No. of Outputs: 1 Output
Output Power Max: 15W
Input Voltage VAC: 85V AC to 264V AC
Input Voltage AC Max: 264V
Input Voltage AC Min: 85V
Power Supply Output Type: Fixed
Output Current - Output 1: 1.3A
Output Current - Output 2: -
Output Current - Output 3: -
Output Current - Output 4: -
Output Voltage - Output 1: 12VDC
Output Voltage - Output 2: -
Output Voltage - Output 3: -
Output Voltage - Output 4: -
Power Supply Applications: ITE
Power Rating (Forced Cooling): -
Power Rating (Convection Cooling): 15W

Delivery and price
Units per pack	10
Price	28.62 €
Current stock	10+
Lead time	30 days

Datasheet

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TR ® AC/DC Power Supplies<br>- [AC] TOF Series, 10–150 Watt<br>mee<br>CB<br>Scheme<br>Features Obsolete<br>**----- End of picture text -----**<br>


## Features 

- Compact open-frame power supplies 

- Easy connection via screw terminal block or molex pin connector terminal 

- Universal input 85–264 VAC 

- Industrial grade components 

- Low ripple and noise 

- Overload protection 

- EMI meets EN55022, Class B 

- Optional with case 

- Low profile 

- Lead free design, RoHS compliant 

- 3-year product warranty 

The TOF Series power supplies are the choice for demanding applications. They feature compact dimensions and a low profile. They are easy to instal and connect via screw terminals or pin connector. Chassi and cover kit are available as an accessory. Compliance with international safety standards (CE/UL) and EMC requirements qualify this product for worldwide use. A very high reliability is guaranteed by the use of industrial quality grade components. 

|Ordercode<br>Screw Terminal Block|Ordercode<br>Molex Pin Connector|Output Power|Output Voltage|Output Current<br>max.|
|---|---|---|---|---|
|TOF 10-05S<br>TOF 10-12S<br>TOF 10-15S<br>TOF 10-24S<br>Not recommended for new design in|TOF 10-05SM<br>TOF 10-12SM<br>TOF 10-15SM<br>TOF 10-24SM|10 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|2.0 A<br>0.9 A<br>0.7 A<br>0.5 A|
|TOF 15-05S<br>TOF 15-12S<br>TOF 15-15S<br>TOF 15-24S<br>Not recommended for new design in|TOF 15-05SM<br>TOF 15-12SM<br>TOF 15-15SM<br>TOF 15-24SM|15 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|3.0 A<br>1.3 A<br>1.0 A<br>0.7 A|
|TOF 30-05S<br>TOF 30-12S<br>TOF 30-15S<br>TOF 30-24S<br>Not recommended for new design in|TOF 30-05SM<br>TOF 30-12SM<br>TOF 30-15SM<br>TOF 30-24SM|30 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|6.0 A<br>2.5 A<br>2.0 A<br>1.3 A|
|TOF 50-05S<br>TOF 50-12S<br>TOF 50-15S<br>TOF 50-24F<br>Obsolete discontinued December 2013|TOF 50-12SM<br>TOF 50-15SM<br>TOF 50-24FM|50 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|10.0 A<br>4.3 A<br>3.5 A<br>2.1 A(3.0 A)*|
|TOF 75-05S<br>TOF 75-12S<br>TOF 75-15S<br>TOF 75-24F<br>Obsolete discontinued December 2013|TOF 75-12SM<br>TOF 75-15SM<br>TOF 75-24FM|75 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|15.0 A<br>6.3 A<br>5.0 A<br>3.2 A(4.5 A)*|
|TOF 100-05S<br>TOF 100-12S<br>TOF 100-15S<br>TOF 100-24F<br>Obsolete discontinued December 2013|TOF 100-12SM<br>TOF 100-15SM<br>TOF 100-24FM|100 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|20.0 A<br>8.5 A<br>6.7 A<br>4.2 A(6.3 A)*|
|TOF 150-05S<br>TOF 150-12S<br>TOF 150-15S<br>TOF 150-24F<br>Obsolete discontinued December 2013|TOF 150-12SM<br>TOF 150-15SM<br>TOF 150-24FM|150 Watt|5 VDC<br>12 VDC<br>15 VDC<br>24 VDC|30.0 A<br>12.5 A<br>10.0 A<br>6.3 A(9.1 A)*|



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AC/DC Power Supplies TOF Series 10–150 Watt 

## 10–150 Watt 

## Triple Output Models:  Not recommended for new design in! 

|Ob<br>Di|Order code|Output Power max.|*Output 1|*Output 2/3|
|---|---|---|---|---|
||Screw Terminal Block||||
||TOF 15-0522T|15 Watt|5 VDC/2A<br>5 VDC/2A|±12 VDC/0.5A<br>±15 VDC/0.45A|
||TOF 15-0533T<br>olete<br>2011||||
||TOF 30-0522T<br> <br>continued Y|30 Watt|5 VDC/4A<br>5 VDC/4A|+12 VDC/1.2A<br>–12 VDC/0.5A<br>+15 VDC/1.0A<br>–15 VDC/0.5A|
||<br>||||
||TOF 30-0533T||||
||||||



* Total power should not exceed nominal power 

## Order Codes for Chassis/Cover Kit 

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Code for Models Code for Models Code for Models<br>TOF 10-MC TOF 10-xx TOF 50-MC TOF 50-xx TOF 150-MC TOF 150-xx<br>TOF 15-MC TOF 15-xx TOF 75-MC TOF 75-xx TOF 15T-MC TOF 15-xxxT<br>TOF 30-MC TOF 30-xx TOF 100-MC TOF 100-xx TOF 30T-MC TOF 30-xxxT<br>**----- End of picture text -----**<br>


Molex Mating Connectors for TOF .....M Series (to purchase on local market) TOF.....M units are equiped with Molex Pin Connector SPOX 5273-NA (3.96 mm pitch) 

## Connector mates with 

1x Housing 09-50-1051, 3x Crimp Terminal 08-70-1028:  For all Models Input 1x Housing 09-50-1031, 2x Crimp Terminal 08-70-1028:  For up to 50 W models output 2x Housing 09-50-1031, 4x Crimp Terminal 08-70-1028:  For 75 and 100W models output 2x Housing 09-50-1051, 6x Crimp Terminal 08-70-1028:  For 150W models output 

## ~~Input Specifications~~ 

||Input voltage range<br>85 – 264 VAC<br>110 – 370 VDC(10...50 W single output models )<br>Input frequency<br>47 – 63 Hz<br>Recommended circuit breaker<br>10...75 Watt models:5.0 A<br>(characteristic C) or slow blow fuse<br>100 & 150 Watt models:10.0 A<br>~~Output Specifications~~<br>Voltage adjustment range<br>10...50 Watt single output models:±5 %<br>75...150 Watt single output models:±10 %<br>15...30 Watt multi output models:±15 % on output 1<br>±2.5 % on output 2&3<br>Regulation<br>– Input variation<br>0.5 % max.<br>– Load variation single output mod. (10–90%)<br>0.5 % max.<br>– Load variation multi output mod. (10–90%)<br>2.0 % on output 1<br>1.0 % on output 2&3<br>Ripple and noise(20Mhz Bandwidth)<br><1 % Vout +50 mVp-p<br>Overloadprotection bycurrent limit at<br>>105 % Inom.<br>Short circuitprotection<br> indefinite(automatic recovery)<br>Overvoltageprotection<br>115 – 140 % Vout nom.<br>Capacitive load<br>10’000µF max.|
|---|---|



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## AC/DC Power Supplies TOF Series 10–150 Watt 

||~~General Specifications~~<br>Temperature ranges<br>– Operating<br>–10°C to +60°C<br>– Derating<br>above +50°C: 5 %/K<br>– Storage (non operating)<br>–20°C to +75°C<br>Temperature coefficient<br>0.02 %/K<br>Efficiency<br>– Single output models<br>78 % typ.<br>– Multi output models<br>70 % typ.<br>Humidity (non condensing)<br>85 % rel H max.<br>Switching frequency<br>– Single output models<br>140 kHz typ.(puls width modulation)<br>– Multi output models<br>150 kHz typ. at 50 % load(frequencymodulation)<br>Hold-up time<br>– Single output models Vin = 115/230 VAC<br>30 ms typ.<br>– Multi output models Vin = 115/230 VAC<br>20 ms typ.<br>Isolation voltage(60sec.)<br>– Input/Output<br>3‘000 VDC<br>Leakage current<br>0.75 mA RMS typ. / 230 VAC / 50 Hz<br>ELectromagnetic compatibility (EMC), Emissions<br>– Conducted input RI suppression<br>EN 55022, class B, FCC part 15, level B<br>– Harmonic current emissions<br> IEC/EN 61000-3-2, class A(75-150 Watt models)<br>ELectromagnetic compatibility (EMC), Immunity<br>– Electrostatic discharge ESD<br>IEC/EN 61000-4-2 level 2<br>4 kV / 4 kV<br>– RF field susceptibility<br>IEC/EN 61000-4-3 level 2<br>3 V /m<br>– Electrical fast transients/bursts on mainsline<br>IEC/EN 61000-4-4 level 2<br>1 kV<br>– Surge<br>IEC/EN 61000-4-5 level 2<br>0.5 kV / 1kV<br>– Voltage dip<br>IEC/EN 61000-4-11<br>Safetystandards<br>IEC/EN 60950-1, cUL/UL 60950-1<br>Safety approvals<br>– UL/cUL 60950-1<br> www.ul.com-> certifications -> File e141988<br>– CB report (IEC 60950-1, 2nd edition)<br> www.tracopower.com/products/tof-cb.pdf<br>Reliability, calculated MTBF(MIL-HDBK-217F, at +25°C,ground benign)<br>>250‘000 h<br>Vibration<br>10–55 Hz 0.5 mm width/ 1 minute cycle<br> (3 directions each 30 minutes)<br>Shock<br>20 G(3 directions each 3 times)<br>Environmental compliance<br>– Reach<br> www.tracopower.com/products/tof-reach.pdf<br>– RoHS<br> RoHS directive 2011/65/EU|
|---|---|



All specifications valid at nominal input voltage, full load and +25°C after warm-up time unless otherwise stated. 

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AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

TOF 10 standard open frame version 

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L +Vout<br>N -Vout<br>2 x ø3.5<br>(FG)<br>3.5 98 ±0.5 (3.86 ±0.02)<br>(0.14)<br>105 (4.13)<br>(1.97) ±0.5 )±0.02<br>50 43 (1.69<br>3.5 (0.14)<br>(0.79)<br>20<br>3 max. (0.12 max.)<br>**----- End of picture text -----**<br>


Weight: 75 g (2.6 oz) 

## TOF 10 with chassis / cover option 

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ø3.5<br>4 x M3<br>thread 5 115 ±0.5 (4.53 ±0.02)<br>(0.2)<br>125 (4.92)<br>ø3.5<br>2 x M3<br>thread<br>) 3.5<br>(0.14)<br>(2.24) ±0.5 ±0.02<br>57  30 (1.18<br>28.5 (1.12)<br>13.5 (0.53)<br>3.5 (0.14)<br>11 (0.43)<br>(1.26)<br>16 (0.63) 32<br>**----- End of picture text -----**<br>


Weight: 175g (6.2 oz) 

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## AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 15 standard open frame version 

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+Vout<br>L<br>-Vout<br>N<br>4 x ø3.5<br>(FG)<br>3.5 118 ±0.5 (4.65 ±0.02)<br>(0.14)<br>125 (4.92)<br>50.97)(1 43±0.5 )(1.69 ±0.02<br>3.5 (0.14)<br>(0.79)<br>20<br>3 max. (0.12 max.)<br>**----- End of picture text -----**<br>


Weight: 90 g (3.2 oz) 

TOF 15 with chassis / cover option 

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ø3.5<br>4 x M3<br>thread 5 135 ±0.5 (5.31 ±0.02)<br>(0.2)<br>145 (5.71)<br>ø3.5<br>2 x M3<br>thread<br>) 3.5 (0.14)<br>(2.24) ±0.5 ±0.02<br>57  30  (1.18<br>28.5 (1.12)<br>13.5 (0.53)<br>3.5 (0.14)<br>11 (0.43) (1.26)<br>32<br>16 (0.63)<br>**----- End of picture text -----**<br>


Weight: 210 g (7.4 oz) 

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## AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 30 standard open frame version 

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(FG) (FG)<br>N<br>L +Vout<br>4 x ø3.5 -Vout<br>5 123 ±0.5 (4.84 ±0.02)<br>(0.2)<br>133 (5.24)<br>)<br>(2.17) 0.5± ±0.02<br>55 45  (1.77<br>5 (0.2)<br>(0.98)<br>25<br>3 max. (0.12 max.)<br>**----- End of picture text -----**<br>


Weight: 170 g (6 oz) 

TOF 30 with chassis / cover option 

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2 x ø3.5<br>4 x M3<br>7 150 ±0.5 (5.91 ±0.02)<br>thread<br>(0.28)<br>163 (6.42)<br>ø3.5<br>2 x M3<br>thread<br>) ) 3.5 (0.14)<br>(2.56) ±0.5 ±0.02 ±0.5 ±0.02<br>65  20 (0.79  40 (1.57  )<br>±0.5 ±0.02<br>23 (0.91) 33 (1.30<br>13 (0.51)<br>3.5 (0.14)<br>10 (0.39) (1.42)<br>36<br>15 (0.59)<br>**----- End of picture text -----**<br>


Weight: 320 g (11.3 oz) 

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AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 50 standard open frame version 

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(FG) (FG)<br>N<br>L +Vout<br>4 x ø 3.5 -Vout<br>5 185 ±0.5 (7.28 ±0.02 )<br>(0.2)<br>195 (7.68)<br>)(2.17 0.5±  )±0.02<br>55 45 (1.77<br>5 (0.2)<br>(0.98)<br>25<br>3 max. (0.12 max.)<br>**----- End of picture text -----**<br>


Weight: 245 g (8.6 oz) 

## TOF 50 with chassis / cover option 

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2 x ø3.5<br>4 x M3<br>8 210 ±0.5 (8.27 ±0.02)<br>thread<br>(0.31)<br>225 (8.86)<br>ø3.5<br>2 x M3<br>thread<br>) ) 3.5 (0.14)<br>(2.56) ±0.5 ±0.02 ±0.5 ±0.02<br>65 20 (0.79  40 (1.57  )<br>±0.5 ±0.02<br>23 (0.91) 33 (1.30<br>13 (0.51)<br>3.5 (0.14)<br>10 (0.39) (1.42)<br>36<br>15 (0.59)<br>**----- End of picture text -----**<br>


Weight: 455 g (16.0 oz) 

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## AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 75 standard open frame version 

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(FG)<br>-Vout<br>L<br>N 4 x ø3.5<br>+Vout<br>5 212 ±0.5 (8.35 ±0.02)<br>(0.2)<br>222 (8.74)<br>Weight:<br>TOF 75 with chassis / cover option<br>2 x ø4.5<br>4 x M4<br>9 235 ±0.5 (9.25 ±0.02)<br>thread<br>(0.35)<br>252 (9.92)<br>ø4.5<br>2 x M4<br>thread<br>)(2.17 ±0.5 )±0.02<br>55 45  1.77 (<br>5<br>(0.2)<br>26 (1.02)<br>3 max. (0.12 max.)<br>)  ) 4.5 (0.18)<br>(2.56) ±0.5 ±0.02 ±0.5 ±0.02<br>65  20  (0.79  40  (1.57  )<br>±0.5  ±0.02<br>23 (0.91) 13 (0.51) 33  (1.30<br>4.5 (0.18)<br>15 (0.59) (1.65)<br>42<br>15 (0.59)<br>**----- End of picture text -----**<br>


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Weight:  280 g (9.9 oz)<br>**----- End of picture text -----**<br>


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TOF 75 with chassis / cover option<br>**----- End of picture text -----**<br>


Weight: 525 g (18.5 oz) 

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## AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 100 standard open frame version 

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(FG)<br>N -Vout<br>L<br>4 x ø3.5 +Vout<br>5 212 ±0.5 (8.35 ±0.02)<br>(0.2)<br>222 (8.74)<br>(2.44) ±0.5 )±0.02<br>62  52  (2.05<br>5 (0.2)<br>(1.26)<br>32<br>3 max. (0.12 max.)<br>**----- End of picture text -----**<br>


Weight: 380 g (13.4 oz) 

## TOF 100 with chassis / cover option 

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2 x ø4.5<br>4 x M4<br>9 235 ±0.5 (9.25  ±0.02)<br>thread<br>(0.35)<br>252 (9.92)<br>ø4.5<br>2 x M4<br>thread<br>Weight:  655 g (23.1 oz)<br>) ) 4.5<br>(0.18)<br>(2.83) ±0.5 ±0.02 ±0.5 ±0.02<br>72  25  (0.98  45 (1.77  )<br>±0.5 ±0.02<br>24 (0.94) 36  (1.42<br>14 (0.55)<br>4.5 (0.18)<br>15 (0.59) (2.00)<br>45<br>20 (0.79)<br>**----- End of picture text -----**<br>


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## AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 150 standard open frame version 

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(FG)<br>+Vout N<br>L<br>-Vout<br>4 x ø3.5<br>5 212 ±0.5 (8.35 ±0.02)<br>(0.2)<br>222 (8.74)<br>(2.95) ±0.5 )±0.02<br>75  65  (2.56<br>5 (0.2)<br>(1.46)<br>37<br>3 max. (0.12 max.)<br>**----- End of picture text -----**<br>


Weight: 540 g (19.0 oz) 

## TOF 150 with chassis / cover option 

2 x ø4.5 

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4 x M4<br>thread 9 235 ±0.5 (9.25 ±0.02)<br>(0.35)<br>252 (9.92)<br>ø4.5<br>2 x M4<br>thread<br>) ) 4.5 (0.18)<br>(3.35) ±0.5 ±0.02 ±0.5 ±0.02<br>85  35  (1.38  55  (2.17  ±0.5 )±0.02<br>25 (0.98) 43  (1.69<br>15 (0.59)<br>4.5 (0.18)<br>15 (0.59) (2.00)<br>51<br>20 (0.79)<br>**----- End of picture text -----**<br>


Tolerances: ±1.0 mm (±0.04) 

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Weight:  865 g (30.5 oz)<br>**----- End of picture text -----**<br>


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AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 15-T standard open frame version 

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127 (5.0)<br>120 ±0.5 (4.7 ±0.02)<br>7 7<br>(0.28) (0.28)<br>N CH3<br>L CH2<br>CH1<br>4x d=3.5 7<br>7 (4x d=0.14) (0.28)<br>(0.28)<br>(0.28) 7<br>7 (0.28)<br>(1.97)<br>50 43 ±0.5 (1.69 ±0.02) 7<br>(0.28)<br>3.5 (0.14) 7 (0.28)<br>22.6 (0.89)<br>1.6 (0.06) 2.5 (0.9)<br>**----- End of picture text -----**<br>


Weight: 107g (3.8 oz) 

TOF 15-T with chassis / cover option 

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135 ±0.5<br>(5.3 ±0.02)<br>13.5 120 ±0.5 (4.7 ±0.02)<br>d=3.5 [(][0.14][)]<br>147 (5.8)<br>2xM3 thread<br>(0.53)<br>28.5 (1.13)<br>(2.25)<br>25 ±0.5<br>43 ±0.5 (1.69 ±0.02) (0.98 ±0.02) 57<br>(1.5)<br>0.5 38<br>29 ±0.5 (1.14±0.02) 19 ± (0.75 ±0.02)<br>**----- End of picture text -----**<br>


Weight: 226g ( 8 oz) 

Tolerances: ±1.0 mm (±0.04) 

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## AC/DC Power Supplies TOF Series 10–150 Watt 

## ~~Outline Dimensions mm (inches)~~ 

## TOF 30-T standard open frame version 

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140 (5.5)<br>4 (0.16) 132 ±0.5(5.2 ±0.02)<br>7 7<br>(0.28) (0.28)<br>N CH3<br>L CH2<br>CH1<br>4x d=3.5 7<br>7 (4x d=0.14) (0.28)<br>(0.28)<br>Weight:  170g (6 oz)<br>TOF 30-T with chassis / cover option<br>5.0 (0.20) 150 ±0.5<br>(5.91 ±0.02)<br>14 132<br>(0.55) (5.2)<br>Weight:  337g (11.9 oz)<br>d=3.5 [(][0.14][)] 160<br>2xM3 thread (6.3)<br>(2.83)<br>7 7 (0.28)<br>(0.28)<br>)0.02<br>(2.56)<br>65 57 ±0.5<br>(2.25 ±<br>7 (0.28)<br>4<br>(0.16) 7 (0.28)<br>22.6 (0.89)<br>1.6 (0.06)<br>2.5 (0.09)<br>36<br>0.02) 0.02) 0.02) 3.5 (0.14) (1.42)<br>72<br>57 ±0.5 40 ±0.5 20 ±0.5<br>(2.25 ± (1.59 ± (0.78 ±<br>3.5 (0.14)<br>0.02) 0.02)<br>29 (1.14) 38 (1.5)<br>29 ±0.5<br>(1.14 ± 19 ±0.5 (0.75 ±<br>**----- End of picture text -----**<br>


## TOF 30-T with chassis / cover option 

Specifications can be changed without notice! Make sure you are using the latest documentation, downloadable at www.tracopower.com 

Rev. December 13. 2013 Page 12 of 12 

**www.tracopower.com**

Updated at April 27, 2026

TRACO Electronic AG, operating globally under the Traco Power brand, is a premier Swiss power supply specialist with over 35 years of industry expertise. Renowned for engineering high-quality power conversion products, the company delivers reliable, cost-effective solutions tailored to the exacting standards of industrial, medical, railway, and automation applications. The cornerstone of our Traco Power portfolio is an extensive selection of power conversion systems. Our offering is heavily focused on a vast array of high-performance AC/DC converters engineered to provide exceptional efficiency and safety for sensitive electronics. This is complemented by a robust lineup of DC/DC converters built to ensure stable, isolated power delivery in challenging environments. Beyond flagship power supplies, the Traco Power range includes specialized passive components and thermal management solutions essential for complete system integration. We supply power inductors, common mode chokes, and power line filters designed for rigorous EMC and RFI suppression, alongside natural convection heat sinks that guarantee optimal thermal performance and prolonged component lifespan.

About Novapart

Novapart is a B2B electronic component broker specialising in stock shortages and cost reduction. We source hard-to-find parts and identify compliant alternatives across a catalogue of 410,000+ components from 500+ manufacturers.

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Stock Shortage Specialist

When a component is unavailable, discontinued or has an unacceptable lead time, we tap into our network of vetted European and Asian distributors to source what you need — without compromising on quality or traceability.

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Compliant Alternatives

We identify pin-to-pin, electrically equivalent substitutes that meet the same certifications (RoHS, AEC-Q100, REACH) as your original specification — validated against datasheets, not just part numbers. Often at a lower cost.

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