125A Mobile 3 Phase Distro Box
This 125A distro box is a portable three-phase power distribution equipment designed for temporary outdoor & indoor event power supply. It adopts IEC 60309 industrial connector standard, built inside wheeled flight case structure for frequent relocation.
Mechanical Structure
The enclosure is a heavy-duty plastic flight case equipped with 4 casters: 2 braked swivel wheels + 2 directional wheels. Interior fitted with CNC-cut flame-retardant EVA foam for socket positioning and vibration damping.
- Input: 1 pcs 125A 5P male industrial plug (3L+N+PE)
- Primary outputs: 2 pcs 63A 5P female sockets, 2 pcs 32A 5P female sockets
- Secondary outputs: 12 pcs 16A 3P single-phase female sockets (L+N+PE)
Built-in main isolator switch and branch MCB protection for each circuit
Recessed socket layout reduces physical impact on connected plugs; side mounting panel reserved for equipment ID marking.
Electrical Working Principle
- The unit operates on a 5-wire 3-phase power system (L1/L2/L3 + Neutral + Protective Earth).
- 3-phase mains power feeds into the unit via the 125A 5-pin input plug to the main busbar.
- Power passes through the main isolator for global power cut-off.
- Main busbar splits into two 63A 3-phase circuits and two 32A 3-phase circuits.
- Three-phase lines are phase-balanced to derive 12 single-phase 16A circuits, evenly distributed across L1, L2, L3 phases to avoid phase imbalance.
- Every independent circuit is protected by miniature circuit breakers against overload and short circuit.
Construction Materials
| Outer housing: | High-impact engineering plastic flight case, impact resistance for touring transport |
| Internal shock lining: | Closed-cell flame retardant EVA foam |
| Busbar: | T2 copper with tin plating for low contact resistance |
| Connectors: | IEC 60309 industrial polyamide sockets, UV-resistant |
| Internal wiring: | Flexible heat-resistant multicore power cable, rated 90°C |
| Switchgear: | Thermomagnetic MCBs compliant with IEC 60898 |
Operating Conditions
- Rated operational voltage: 380V~415V 3-phase AC, 50Hz
- Rated input current: 125A maximum continuous load
- Ambient working temperature: -10°C ~ +40°C
- Suitable for temporary installation; not for permanent fixed building power distribution
- IP rating of sockets: IP44 under normal plugged condition
- Maximum allowable altitude: ≤1000m without power derating
Standard Application Workflow
Typical Applications
Stage lighting systems, live concert events, film & TV location shooting, outdoor exhibition power supply, mobile tent power, touring rental equipment, outdoor broadcast vehicle auxiliary power.
Typical Applications
Stage lighting systems, live concert events, film & TV location shooting, outdoor exhibition power supply, mobile tent power, touring rental equipment, outdoor broadcast vehicle auxiliary power.
1: What is the maximum continuous loading capacity of this 125A distro box?
Rated continuous input current is 125A @ 400V 3-phase. Total combined load of all output sockets cannot exceed 125A. Phase balance is mandatory; single-phase unbalance current should not exceed 25A to avoid neutral overheating. Peak inrush current from lighting loads can be tolerated within 180A for ≤5 seconds.
2: Does this distro box come with built-in circuit protection for every outlet?
Yes. It is equipped with a main isolator switch for full unit power cut-off. All 63A, 32A three-phase circuits and 16A single-phase branches are protected by independent thermomagnetic MCBs compliant with IEC 60898. Short-circuit and overload protection are available for each individual circuit. Residual current devices (RCD/GFCI) can be configured as an optional upgrade.
3: What standard do the industrial plugs and sockets comply with?
All connectors follow IEC 60309-1 / IEC 60309-2 international standard. The 5-pin configuration is 3P+N+PE, rated IP44 when fully mated. Compatible with all standard European event generator cables and touring power cables.
4: Can this power distro box be transported frequently for touring rental work?
Designed for touring applications. The housing is heavy-duty impact-resistant plastic flight case fitted with 4 wheels (2 lockable swivel casters + 2 directional wheels). CNC cut flame-retardant EVA foam eliminates socket vibration during transit. The unit supports repeated road transport; avoid stacking heavy loads directly on the front socket panel.
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