1. What Is a PZ30 Box? (Terminal Combination Apparatus)
PZ30 = Modular terminal distribution box, fitted with miniature circuit breakers (MCB), used for final-stage distribution in homes and offices, rated current ≤ 63A. Advantages include DIN rail mounting and flexible circuit combinations.
2. PZ30 Size Chart (by Circuit Count)
| Circuits | the number of poles | Surface Mount (mm) | Flush Mount (mm) | Height |
|---|---|---|---|---|
| 6 | 6 | 210×150×80 | 200×140×80 | 80 |
| 12 | 12 | 300×240×100 | 280×220×90 | 90 |
| 18 | 18 | 400×300×100 | 380×280×90 | 90 |
| 24 | 24 | 480×320×100 | 460×300×90 | 100 |
| 36 | 36 | 600×400×120 | 560×360×100 | 120 |
3. Surface Mount vs. Flush Mount (How to Choose)
Flush mountClean look (flush with wall), requires a pre-formed wall opening;Surface mountSimple installation, enclosure protrudes 80–100mm from the wall. Choose flush mount for new construction, surface mount for renovations.
4. How to Determine Circuit Count (by Appliance)
- Lighting 1 circuit + 1 spare
- Sockets 2–3 circuits (separate general/kitchen/AC)
- Dedicated AC circuits 1–2 (floor-standing/wall-mounted)
- 1 dedicated circuit per high-power appliance (water heater/oven)
5. PZ30 Buying Guide (3 Things to Check)
① Checkthe number of poles(circuits × 1 or 2 poles); ② Checkthe breaker brand(Schneider / Chint / ABB); ③ Checkthe enclosure material(powder-coated steel / stainless steel / ABS plastic).
FAQ FAQ
What is the maximum number of circuits for a PZ30?
36 circuits is common; for more, use an XL-21 power distribution box.
How large an opening should be left in the wall for a flush-mounted PZ30?
Enclosure outer dimensions + 10 mm clearance on all sides.
Can a PZ30 take an RCD?
Yes. Each circuit can have an MCB + RCD module, or a single main RCD.
What is the difference between PZ30 and PZ40?
The PZ40 has a higher ingress protection (IP) rating (IP40) and a similar structure; it is mainly used in damp environments.
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