The 125A mobile power distribution box is a heavy-duty portable three-phase power distribution unit designed for temporary high-current power distribution. The unit accepts 400V three-phase AC input via a 125A 5-pin IEC60309 industrial inlet, splitting bulk mains power into multiple independent single-phase and three-phase output circuits for on-site electrical loads.
This wheel-mounted power distro eliminates complicated hardwiring, enabling fast plug-and-play power deployment for mobile working environments.
Construction & Mechanical Structure
The outer housing is manufactured via rotational moulding of high-density polyethylene (HDPE). This material delivers outstanding shock resistance against repeated transit impacts. Four heavy-duty swivel castors (two with brakes) are pre-installed at the base, while robust stainless steel locking latches secure the hinged front door. The enclosure achieves IP54 ingress protection, blocking airborne dust and resisting light water splashes for indoor and semi-outdoor deployment.
Electrical Layout & Technical Specifications
Main Rated Parameters
- Rated Input Current: 125A
- Rated Operating Voltage: 400V 3P+N+PE three-phase
- Standard: IEC 60309 industrial plug & socket standard
- Inlet: 1 × 125A 5-pin red industrial power inlet
- Output Socket Configuration:
- 24 × 16A 230V blue single-phase sockets
- 3 × 16A 230V blue single-phase sockets
- 3 × 32A 400V red three-phase sockets
Every individual output circuit is fitted with dedicated miniature circuit breakers (MCBs). Tinned copper busbars run internally to lower contact resistance and prevent oxidation under continuous high-load operation. Phase balancing is reserved during assembly to avoid uneven load distribution across three phases.
Working Principle
Three-phase mains power enters the cabinet through the 125A main inlet and feeds the integrated main busbar system. Current is separated into isolated output branches controlled by independent circuit protection devices. Each connected electrical load receives regulated power from its dedicated circuit; if short-circuit or overload occurs, the corresponding circuit breaker trips automatically without cutting power to all other connected equipment.
Typical Application Scenarios
This mobile power distribution box is widely adopted for applications requiring flexible temporary power:
Core Advantages
- Mobile wheeled design allows rapid repositioning without hoisting or disassembly.
- Modular IEC60309 sockets support direct connection to standard industrial extension cables.
- Independent circuit protection limits fault spread and improves site electrical safety.
- Rugged rotomolded cabinet requires minimal maintenance under frequent transport.
- IP54 rating supports use in covered outdoor environments.
Compliance & Safety Standards
The power distribution cabinet complies with IEC 60309, IEC 60439-1 low-voltage switchgear assembly standards. All conductive internal components are reliably earthed. Clear socket labelling and phase identification simplify safe connection and routine electrical inspection by site electricians.
1: What is the maximum continuous operating current of this 125A mobile power distribution box?
The cabinet is rated for a maximum continuous input current of 125A at 400V three-phase. Operators need to balance loads on L1/L2/L3 to avoid single-phase overload and three-phase unbalance.
Does each output socket have separate circuit breaker protection?
Yes. Every output circuit is protected by an independent MCB. A short circuit or overload on one socket circuit will only trip its dedicated breaker and will not cut power to all other connected devices.
3: Can this power distro box be fitted with RCD residual current protection?
Yes. We support custom upgrades to install RCD/RCBO residual current devices for earth leakage protection, meeting stricter electrical safety requirements for outdoor events and construction sites.
4: What material is the cabinet housing made of, and what are its benefits?
The enclosure adopts rotomolded HDPE polyethylene. It features impact resistance, anti-corrosion properties, water and dust resistance, and avoids rust issues compared with metal cabinets during frequent transport.
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