Modular main center 400A with Spine is a temporary worksite board for construction projects and events. Its development closely followed user feedback and needs, making this board a smart and versatile solution. The board has a slot for a kWh meter.

Modular main center 400A with Spine – the modular output side expands as needed

The modular output side provides fuse-switch outputs and a socket outlet module as standard. Modularity makes it possible to add fuse-switches or socket outlet modules to the board, giving it extra socket and fuse-switch outputs as the customer needs. In the standard configuration the board has 2 free module slots.

Modular main center 400A with Spine – designed to make the installer’s job easier

The design takes the installer’s work into account in several ways:

• Connecting the supply cables is easy thanks to the open frame design. Cables don’t need to be threaded under the board — the bottom panels are removed for the duration of installation.
• The phase fuses are color-coded for clarity and safety: brown (L1), black (L2) and grey (L3).
• The board is designed so a 63A cable can bend smoothly under the door through the brush seals.

The board’s frame is made of powder-coated aluminium, making it extremely durable and light. Forklift pockets and lifting eyes ensure it’s easy to move, and triangular-key lockable doors on both sides ensure security. The board stands on a sturdy welded aluminium base, adding to its stability and durability.

Durable design for demanding use

The Spine remote monitoring system is integrated as standard into every board and can be activated as needed. The Spine system enables real-time monitoring of energy consumption and CO2 emissions. It also sends proactive alarms, such as warnings about unbalanced load, over- and undervoltage, and other fault conditions — helping prevent disturbances in the worksite’s electrical network before they occur.

Spine remote monitoring as standard

All boards are manufactured at our own factory, ensuring high quality and fast availability of spare parts. The boards are logistically efficient and designed to match the size of a FIN pallet (80×120 cm), making storage and transport easier. The product meets the requirements of the EN 61439-4 standard.

Modular main center 400A with Spine – technical data

• Rated current: 400A
• Rated voltage: 400V
• Incoming fuses: 2 x NH1 250A
• Supply cable size: 2 x 95-300mm2
• Fuse-switch outputs: 4 x SLK 160
  1 x SLK 400
• Socket outlets: 2 x 16A/230V
  1 x 16A
  2 x 32A
  1 x 63A
• RCD: 1 x 300 mA
  3 x 30 mA
• Short-circuit rating: Icf = 25 kA
• Weight: 254.5 kg
• Dimensions (H x W x D): 1.83 x 1.2 x 0.8 m
• Enclosure rating: IP44
• Equivalent model number: ZFSF400/41/2121-31

Does this model suit your site? Add the product to the quote cart at the top of the page to get a quote.

Modular main center 400A with Spine on the worksite

Spine is a remote monitoring system. Measurement data is sent to the cloud service where it can be viewed on any device – nobody needs to travel to the site to read a meter.

The service shows electricity consumption, load distribution between phases, voltage drop and CO₂ emissions, among others. Predictive alarms can be set so a deviation is caught before it stops the work.

The same cloud service gathers every Spine unit on the site into one view, however many measuring points there are.

This model is rated 400 A. Size the equipment by the actual simultaneous load – the sum of the nameplate ratings almost always leads to oversizing.

Outputs: 2 x 16A/230V
1 x 16A
2 x 32A
1 x 63A. Count the work points before choosing – the number of outputs decides how many machines one board can feed.

Where Modular main center 400A with Spine is used

Typical sites are construction projects, renovations, industrial maintenance and event power. What they share is that the electrical supply is temporary and the conditions are demanding.

Temporary does not mean lighter requirements. Site equipment is exposed to dust, moisture, moving and mechanical stress in a way that fixed installations never are.

Check the load distribution between phases during use. Uneven distribution overloads one phase while the others run half empty, and the usual symptom is a fuse that keeps tripping.

Modular main center 400A with Spine – how to choose the right model

The equipment is chosen by rated current and outputs. Start by calculating the simultaneous load and the output types needed, and choose the model on that basis.

Other models of the same type are Spine Plug & Play 16A, Spine Plug & Play 32A, Spine Plug & Play 63A, Spine Plug & Play 125A, Spine for 16A-1250A centers with fixed input.

Other details that affect the choice: protection class IP44, short-circuit withstand lcf = 25 kA, RCD 1 x 300 mA
3 x 30 mA, supply cable 2 x 95-300mm2, weight 254,5 kg. These are worth checking already at the quotation stage.

You can see the full range in the product group, and read about real-time monitoring on the Spine page.

Modular main center 400A with Spine – practical notes for use

Winter brings requirements of its own. Condensation forms when cold equipment is brought into the warm, and moisture inside the enclosure is a common reason for an RCD tripping with no visible cause.

Mark the equipment with the site details and keep a record of what is fed from where. On a site with several contractors that saves time at every fault-finding.

RCD protection is mandatory for socket outputs on a site. Its operation is tested with the test button at commissioning and at regular intervals afterwards.

Modular main center 400A with Spine – installation and maintenance

Installation and connection work is carried out by a qualified electrician. The equipment must be made dead before connection work, and the absence of voltage verified by measurement.

Place the equipment on level ground and so that it can be reached freely even when the site fills up with material. Material stacked in front blocks both use and emergency isolation.

Test the RCD with its test button at commissioning and at regular intervals afterwards. The test takes a second and is still almost always forgotten.

The unit weighs 254,5 kg. Take the weight into account when moving and lifting – damage is most often caused during transport, not in use.

Check the joints and fixings regularly during use. A joint that heats up is a sign of a fault and should be corrected before the fault spreads.

Safety and inspections

Site electrical installations are subject to the same requirements as fixed installations, and some of them are stricter. The equipment has to withstand moving, dust, moisture and mechanical stress for the whole project.

The installation is inspected at commissioning and regularly during use: enclosure, joints, the operation of the protective devices and the fact that live parts cannot be reached.

Damaged equipment is not repaired improvised on site. A cracked enclosure, a burnt terminal or a damaged socket is replaced – on a site a temporary repair almost always becomes permanent.

Document the configuration and any changes made. Up-to-date information on outputs and protection speeds up fault-finding and the next inspection.

Delivery and sizing help

We deliver the equipment together with the cables and the rest of the site power supply in one delivery, so the set is complete when it arrives on site.

Describe the whole site in your request for quotation: supply power, the outputs needed and the estimated length of the project. We size the set on that basis.

Use the product number 505011016 when ordering and when asking about spare parts. It identifies this exact model, which matters when the same series comes in several sizes.

We also help with the sizing. If you are unsure about the size or the number of outputs, ask us – equipment sized wrong costs more than equipment chosen right the first time.

Frequently asked questions

Can the board be expanded later?

Yes. The modular design makes it possible to add fuse-switches and socket outlet modules to the board as needed — the standard configuration has 2 free module slots.

Does the board include Spine remote monitoring?

Yes, as standard on every board. The Spine system tracks energy consumption and CO₂ emissions in real time and sends proactive alarms, for example on unbalanced load or over/undervoltage.

Where is the board manufactured?

The board is manufactured at TSR-ELSITE’s own factory in Finland, ensuring high quality and fast availability of spare parts.

Which standard does the board meet?

The board meets the requirements of the EN 61439-4 standard.

What is the product’s part number?

The part number is 505011016. You can use it for orders and quote requests.
Didn’t find the answer to your question? Add the product to the quote cart and our sales team will help — or open the chat in the bottom-right corner of the page.

What is the rated current of Modular main center 400A with Spine?

The rated current is 400 A.

What outputs does the product have?

Outputs: 2 x 16A/230V
1 x 16A
2 x 32A
1 x 63A.

Does the product have an RCD?

Residual current device (RCD): 1 x 300 mA
3 x 30 mA.

What is the protection class?

Protection class: IP44.

What is the short-circuit withstand?

Short-circuit withstand: lcf = 25 kA.

What are the dimensions?

Dimensions: 1,83 x 1,2 x 0,8 m.

How much does the product weigh?

Weight: 254,5 kg.

What supply cable is needed?

Supply cable: 2 x 95-300mm2.

Do several measuring points appear in one view?

Yes. The same cloud service gathers all Spine units on the site into one view.

What is the product number?

The product number is 505011016. Use it in requests for quotation and spare part enquiries.

Who may install the product?

Installation is carried out by a qualified electrician. The requirements are explained in more detail on the Tukes website.

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Add to the quotation basket and send us your request – we will confirm availability and delivery time. You can see the full range in the product group.