2 layers54.5 × 29.5 mm
2 layers10.2 × 20.2 mm
Power protection
TheTesla/fuse-iurelectronic fuse with over voltage, over current and reverse polarity protection
- Size
- 10.2 × 20.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 8
- Pads
- 27
- Tracks, vias
- 43, 1
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 21 Dec 2025
- Updated
- 6 Jan 2026
Overview
Power protection is an open-source printed circuit board by TheTesla, from the TheTesla/fuse-iur repository on GitHub. It is a 2-layer board of 10.2 × 20.2 mm with 12 parts on 8 nets, routed with 43 tracks and 1 via.
It is built around the BC857, BSS83P and 1N4148W, with the BZV55B15 and BZV55B18 among its other parts. Its parts include 4 transistors, 3 resistors, 3 diodes and 1 connector.
Main components
5
BC857
SOT-231 PNP 100MHz 100mA 15nA 200mW 45V 5V 650mV 800 PNP SOT-23 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BSS83P
SOT-23MOSFETsTECH PUBLIC
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
BZV55B15
LL-341 Independent 100nA@11V 14.7V~15.29V 500mW LL-34 Zener Diodes ROHSYONGYUTAIZener DiodesBZV55B18
-Zener DiodesTaiwan Semiconductor
README
README.mdElectronic fuse: U, I
This small board protects devices against power faults:
- Reverse polarity of the power source
- Overvoltage
- Overcurrent
Features:
- Bidirectional
- Power consumption: < 1 µA
- Absolute maximum voltage between all pins: 60 V
Author
Stefan Helmert stefan@entrsoerv.de
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R2, R3 |
| 2 | BC857 | Package_TO_SOT_SMD:SOT-23 | Q3, Q4 |
| 2 | BSS83P | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 1 | 1N4148W | Diode_SMD:D_SOD-123 | D2 |
| 1 | 33 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | BZV55B15 | Diode_SMD:D_MiniMELF | D3 |
| 1 | BZV55B18 | Diode_SMD:D_MiniMELF | D1 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
The 11 most common of 12 parts.
Similar boards
- 2 layers93.4 × 87.4 mm
- 2 layers136.4 × 85.6 mm
- 4 layers203.8 × 99.1 mm
ISOpower complete bothboards
practable/iso-power-pcb
Remote power control board for ISO experiment containers, used for remote labs projects
196 partsGPL-3.0 - 2 layers16.8 × 40.3 mm
Lightbarriersyncopamp
TheTesla/lightbarriersync
Robust light barrier with snychronized carrierer wave receiver
44 parts - 4 layers263 × 139.8 mm
LV Board Mk2
Lafayette-Motorsports/LVBoards
LV Board repository for Motorsports created 09.02.2025
184 parts1 - 2 layers99 × 95 mm
- 2 layers38.1 × 25.4 mm
555 I delay
alexanderenrique/alternator_555_timer
CMOS 555 monostable delay circuit for alternator field excitation
18 parts
Questions
How big is the Power protection PCB?
It measures 10.2 × 20.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Power protection use?
12 parts, built around the BC857, BSS83P, 1N4148W and BZV55B15. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Power protection KiCad files?
From the TheTesla/fuse-iur repository on GitHub, at the commit this page was made from: the board is src/elec/power-protection.kicad_pcb and its schematic src/elec/power-protection.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Power protection design in my own project?
Its repository states no licence, so its author keeps all rights: ask TheTesla before reusing the design.