# Cabinet Electrical BOM — the box the HBOX lives inside

**Source:** `Selección de componentes para gabinete2.xlsx` (Helgen, 2026-06)
**Date captured:** 2026-06-19
**Key point:** the HBOX is **not** mounted bare on a machine — it sits **inside an
industrial electrical cabinet (gabinete)** with DIN-rail power and protection
components. This BOM is that cabinet. It is **productized across voltages** (12 /
24 / 48 / 110 / 230 V machines) and **across multiple port terminals** (ICAVE,
Hutchison, TIMSA, EIT, LCT) — i.e. this is heading to **hundreds of cabinets**, so
the fixes must be production-grade and repeatable. *(Pricing/margins omitted here —
see the sheet.)*

---

## Nested-enclosure architecture (important for thermal)

```
  Machine power (12/24/48/110/230 V) + ignition
        │
        ▼   ┌──────────────── Gabinete IP67 (ABS, Yetlebox P3901, 39×29×16 cm) ───────────┐
   breaker  │  DIN rail · terminals · SPD · fuse holder · SSR/opto (ignition sense)        │
   + SPD ──►│  Mean Well DDR-60G-24  ──► clean 24 Vdc  ─────────────┐  (supply dissipates  │
            │                                                       │   heat *inside* box) │
            │     ┌────────── HBOX (3D-printed ASA, sealed) ────────┼───┐                  │
            │     │  PowerBoost 1000C + LiPo · simpleRTK2B+4G · STM32 watchdog │            │
            │     └───────────────────────────────────────────────────┘                  │
            └───────────────────────────────────────────────────────────────────────────┘
```

Two sealed boxes, one inside the other, **with a 60 W-class power supply generating
heat in the outer one**, in full sun. See the thermal note in
`03-Architecture-Hardware/hardware-respec-and-pcb-brief.md` §thermal.

---

## Cabinet catalog (Helgen final selection, by machine voltage)

| Function | 12 V | 24 V | 48 V | 110–230 V |
|---|---|---|---|---|
| **Enclosure (IP67, ABS)** | Yetlebox P3901 | P3901 | P3901 | P3901 |
| DIN rail | Weidmüller TS 35×7.5 | ← | ← | ← |
| Neutral terminals ×5 | Weidmüller WDU 2.5 PA/VI | ← | ← | ← |
| Ground terminals | Weidmüller WPE4 | ← | ← | ← |
| Fuse-holder terminal ×3 | Phoenix Contact 3212166 **PT 6-FSI/C** (blade) | ← | ← | ← |
| Ignition isolation (SSR / opto) | Weidmüller **MOS 12-28VDC** | Weidmüller **TOS 24VDC 2A** | Wago **859-744** | IDEC **RV8S-L-D24-A120** |
| Surge protection (SPD) | Phoenix **TTC-6-TVSD-C-12DC-PT-I** | …**-24DC-** | …**-48DC-** | Phoenix DC + Total Ground **A2021** (AC) |
| Breaker | Phoenix **TMC 81C 05A** (5 A) | ← | ← | Schneider **A9F74202** (2 A, AC) |
| **Power supply → 24 Vdc** | Mean Well **DDR-60G-24** | Mean Well **DDR-60G-24** | Mean Well **DDR-60L-24** | Siemens **6EP1332-1LB00** (SITOP) |

Output rail in all cases: **24 Vdc, ~2.4 A, 60 W**.

---

## What this means for the fix (engineering read)

1. **The cabinet's power & protection are already industrial-grade.** Surge
   suppression (Phoenix TVS/SPD), a breaker, isolated ignition sensing (SSR/opto),
   and a quality regulated supply (Mean Well / Siemens) are present at the cabinet
   level. **The HBOX PCB does NOT need to re-implement input surge/breaker** — it
   can assume a **clean 24 Vdc feed** and an **isolated ignition signal**. That
   simplifies the HBOX redesign (see hardware brief).
2. **So the weak link is confirmed to be inside the HBOX**, exactly where the
   client pointed: PowerBoost 1000C + LiPo + Dupont — not
   the cabinet (the **ASA enclosure** is adequate). The HBOX-internal job is **24 V → 5 V (robust buck) + watchdog +
   the RTK stack**, with the LiPo decision (drop/replace) still open.
3. **Verify the actual fuse value.** The PT 6-FSI/C is a *holder*; the fitted blade
   fuse rating is what matters for the client's "under-rated fuse" concern — read
   the installed fuse and compare to the measured worst-case + inrush.
4. **The Mean Well runs hot inside a sealed box.** At 60 W class it dissipates
   several watts continuously; that heat has nowhere to go in a sealed ABS IP67
   cabinet → it raises the ambient the HBOX (and its 18650 + boost + modem) must
   survive. This is now a **primary thermal driver**, not just solar load.

> Open question for Leo to confirm: does the HBOX receive the cabinet's **24 V**
> (then step down internally), or the raw machine voltage? The BOM implies a clean
> 24 V feed + isolated ignition — confirm so the HBOX power redesign targets the
> right input.