PanelSim is an electrical panel designer and circuit simulator for house and industry wiring. Place real-looking components, join them terminal to terminal with coloured wires, then press Run — the current you would really get appears on the sheet, the breaker that should trip does trip, and the check tells you in plain words what is wrong and which terminal it is on.
There is nothing to install. Open the app, sign in once with Google — one tap, remembered on that device, with no PanelSim account or password — and the drawing board is ready. On Android you can add it to your home screen and it then runs full-screen and offline, with your sheets saved on the device.
Not a schematic — the parts are drawn to look like the real thing: an MCB with its lever and curve printed on it, a contactor with its auxiliary block, a TO-92 transistor, a ¼ W resistor with colour bands painted from the value you type. Drag from the palette, or tap a part and tap the sheet.
Draw it the way the panel looks
Not a schematic — the parts are drawn to look like the real thing: an MCB with its lever and curve printed on it, a contactor with its auxiliary block, a TO-92 transistor, a ¼ W resistor with colour bands painted from the value you type. Drag from the palette, or tap a part and tap the sheet.
House, shop, solar and industrial families — lights, fans, sockets, boards, appliances, safety sensors, motors, pumps, PLC, VFD, soft starter and more
Terminal-to-terminal wiring, auto-coloured by what it carries: phase, neutral, PE, DC, control
Every component can be resized and rotated, and the wires follow it
Grid snap, multi-select, copy/paste, undo/redo, zoom and pinch — and a Find a device search for big sheets
Press Run and watch the current
The sheet is solved like a circuit, not animated: contactor and relay coils pick up at 80% of rated voltage, contacts change state, self-hold and interlocking work because the auxiliary contacts are wired exactly as in the real circuit. Wires turn live and animate with the current; lamps glow; motors show speed and current.
Protection with selectivity: MCB magnetic curves (B/C/D), inverse-time thermal trip, fuses on I²t
Overload relays with class 10/20/30 curves and an Ir setting; RCCB earth leakage at 10–300 mA
Motors with per-winding current, winding heat model and single-phasing detection
Timers, star-delta sequence, dual-channel safety relay, voltage monitoring relay, beacon and hooter
PLC with 8 digital inputs, 4 relay outputs and ladder rungs (NO/NC, coil, set/reset, TON)
Learning by hand
A solderless breadboard you can burn out safely.
Drop a part near the board and it seats itself in the nearest holes — no wire is needed between two legs that share a column, because the board's brass strips are part of the model. Cut the power rails in the middle and the check tells you when the two halves need a jumper link.
420 holes, 14 plug-in parts
Drop a part near the board and it seats itself in the nearest holes — no wire is needed between two legs that share a column, because the board's brass strips are part of the model. Cut the power rails in the middle and the check tells you when the two halves need a jumper link.
Resistor (colour bands from your value), 1N4007 diode, LED, electrolytic capacitor, NPN and PNP transistors, trimmer, tact button
Jumper link, buzzer, LDR, slide switch and a 7805 regulator — all with a real model
An LDR follows the light: turn the dial to dark and a divider biases the transistor — the built-in dark alarm circuit really sounds the buzzer through your speaker
Put an electrolytic in backwards, or feed 40 V into the 7805, and the part is marked DAMAGED — exactly what you want a student to see
Training centres, colleges & self-learners
The breadboard lab is the cheapest safe place to make the mistakes everyone makes: reverse a diode, forget a base resistor, overload a regulator. Nothing burns but the drawing, and the warning says which leg is wrong.
No hardware, no multimeter, no smoke — works on a laptop or a phone
Every fault is reported in plain words next to the terminal it belongs to
Two ready-made labs: the LDR dark alarm and a 12 V → 7805 → clean 5 V LED supply
After the drawing
The paperwork comes out with one click.
The title block, the drawing on white paper, the load schedule, the bill of materials, the wire list with colour names and the wiring check — one printable sheet, ready for the site.
Job sheet & print pack
The title block, the drawing on white paper, the load schedule, the bill of materials, the wire list with colour names and the wiring check — one printable sheet, ready for the site.
Bill of materials
A priced parts list built from what is actually on the sheet, a wire list with sections and colours, wire numbering, and a PNG picture of the drawing for a quotation or a WhatsApp message.
Cable tools
A cable size calculator (load, run length, 1φ/3φ, 25% headroom, 3% lights / 5% power drop limits), a suggested size on every wire, and one-tap auto-size for the whole sheet.
Wiring check
Every light, switch, MCB, RCCB and cable is inspected — missing neutral, bridged switch, no protection, wrong polarity, a rail split in two — and each line points at the device it is about.
Saved as you work
Projects are saved in the browser and can be exported or imported as a JSON file. Six rolling backups are kept, so an accidental New or template click never loses yesterday's sheet.
Offline, one folder
The whole app is one folder that runs from the browser and installs on an Android phone as a normal app. The first open asks you to sign in with Google — one tap, remembered on that device — and after that no internet is needed at all: drawing, simulation, the check and printing all work with the network cable out. The interface is in English, and the sign-in does one job: your name goes on the job sheet you print.
FAQ
Questions about PanelSim.
No. PanelSim is a web app: open it in a browser and it works. On an Android phone you can choose Install app (or Add to Home screen) and it then runs full-screen and offline like any other app, with your work saved on the device.
PanelSim questions
Answers before you buy.
No. PanelSim is a web app: open it in a browser and it works. On an Android phone you can choose Install app (or Add to Home screen) and it then runs full-screen and offline like any other app, with your work saved on the device.
Yes — that is what the wiring check, the cable calculator and the print pack are for: a house DB, lights, fans, sockets and safety sensors, with a parts list and a job sheet for the site. For a big industrial panel, treat the simulation as a design and teaching aid and confirm the final protection settings against the manufacturer's tables.
Completely. There is no server of ours: the app is a folder of files that runs in your browser. Only the first-open sign-in needs the internet, for a few seconds; after that the app keeps working even with the network cable out, and if you happen to be offline at that first moment it offers to continue without signing in. The sign-in adds nothing but your name on the printed job sheet — nothing is uploaded.
That is where PanelSim fits best. The 420-hole breadboard lab, the 15 ready-made circuits and the plain-word wiring check were built for teaching — a student can overload a part, see it marked DAMAGED, and reset it without buying a single component. Talk to us about a licence for a batch of machines.
Once, yes: the first time you open the app a card asks you to sign in with Google before the drawing board appears. It is one tap, it is remembered on that device, and it is not asked again. There is no PanelSim account and no password, the sign-in runs in Google’s own window, and nothing is sent to a server of ours — it does one job: the job sheet you print carries the name and e-mail of the person who prepared it. If you are somewhere with no internet, the app offers to continue without signing in.
English — every screen, device name and check report is in English, and there is no language menu to switch. The layout is left-to-right.
Next step
Try it on a panel you are building
Open PanelSim in the browser, drop in the parts you actually use and simulate the circuit before you wire it.
