Two low voltage switchgear quotations can list the same rating and still describe different products. One is withdrawable switchgear, the other a fixed pattern. Here is how the features differ, where each one shows up in the price, and what to check before you sign.

What you are really comparing in a low voltage switchgear list

A low voltage switchgear quotation has five moving parts: busbar rating, compartment format, devices, enclosure protection and test evidence. Two suppliers can quote the same current and differ on all five. Compare them line by line instead of against the headline price.

Names confuse buyers more than ratings do. An electrical panelboard, a panel board and a switch gear panel often describe the same assembly sold into different markets. Enclosed switchgear adds a barrier around live parts; open-front gear leaves them exposed.

The switchgear vs switchboard question is the same mix-up, so ask for the drawing before you argue about the label.

Range matters too. A supplier who builds one format well rarely builds the other well. Start with the frame: low voltage switchgear keeps the same door hardware, gland plates and internal covers across both formats, which keeps spares simple five years later.

The board also has to fit the plant's power distribution board hierarchy. The format you pick here decides the spares you keep for everything it feeds downstream.

Fixed and withdrawable switchgear, side by side

The format decides how you work on the board for the next 20 years. In fixed switchgear the breaker bolts straight onto the busbar, so the section has to be dead before anyone touches it.

In withdrawable switchgear the breaker rides a drawer that slides out with the section still live.

Switchroom Line-Up

Withdrawable in service

What a switchroom aisle tells you

This switchroom aisle is laid out for drawer work. Every board faces a walkway wide enough to pull a compartment onto its rails, and the mimic panel at the end shows the whole line at a glance.

That clearance is a design decision, not a free gift. A fixed board of the same rating stands in a narrower room, and in hot climates the saving on civil work is real money.

Drawout hardware is a product family in its own right. Withdrawable switchgear uses one chassis per frame size, so a 250A feeder and a 630A feeder share the same rails and the same lifting tool.

Where the switchgear cost of a 480V assembly sits

A 480V switchgear assembly is priced from four blocks: enclosure steel, busbar copper, devices and labour. Copper and labour decide the total, and both of them scale with the fault level you write into the specification.

• Enclosure and busbar: steel gauge, paint system and bar cross-section, roughly 20-25% of the total on a 3200A board.
• Devices: 40-50% of the price, and the widest spread between competing quotations.
• Assembly labour: wiring, torque checks and labelling, 15-20% of the total.
• Testing and documents: 5-10%, and usually the first item a cheap bid cuts.

Device choice moves the number more than anything else. A 630A air circuit breaker from a global brand can cost two to three times a locally assembled unit of the same rating, and both may carry an IEC 60947-2 test certificate.

Voltage class matters for the same reason. Ratings run 400V across most of Europe and Africa, 415V in the Gulf and South Asia, and 480V on export projects. The label on the panel changes the device range you can buy, not the busbar arithmetic.

Fixed switchgear wins on price for stable loads: no drawer rails, no shutters, and fewer contact points on every way.

Fixed Pattern Interior

Inside a fixed board

What you are paying for on the bar

Four breakers, one busbar and no moving parts: this is the cheapest way to hold a set of feeders. Every device bolts onto the bar with nothing sitting between the copper and the load.

It also means the bar has to be dead to change a feeder. Budget one to two hours of isolation for each one, then torque the joints again once the board is back under load.

Site conditions that change the specification

Dust, heat and moisture decide whether you need enclosed switchgear with a higher IP rating or an open-front assembly in a clean switchroom. Cement, quarry and fertilizer plants usually need IP54 as a minimum, with gasketed doors and sealed cable entries.

Heat is the cost nobody budgets for. A sealed 3200A board runs 15-20K above ambient, and every degree of rise shortens device life. On a 40C site that gap decides whether a standard enclosure survives or needs a fan and filter.

Altitude changes the rating as well. Most devices are certified to 2000m and 40C, and above that you derate them. A mine sitting at 2500m needs a larger breaker for the same current, and that is a cost you want on the comparison sheet from day one.

What a comparison sheet should contain

Write the sheet before you open the quotations. These six lines remove most of the ways a cheap bid can look better than it is, and each one takes minutes to prepare.

1. Rating and fault level: the busbar current and the withstand in kA. Without both numbers, price per way means nothing.
2. Format and compartments: fixed, withdrawable or a mix, with the spare ways you want left empty.
3. Device schedule: brand, family and breaking capacity for every feeder, not only the incomer.
4. Enclosure protection: IP rating, material, paint system and design ambient temperature.
5. Test documents: a routine test report for each board and the design verification file.
6. Delivery and spares: the lead time on a repeat order and the price of one spare compartment.

Every quotation you compare should name the edition of IEC 61439 the assembly was built to. That standard is the reference most buyers settle on, because it covers the whole assembly rather than the devices inside it.

What to verify before you release the order

Four checks separate a factory that builds switchgear from one that assembles parts. Two of them you can complete from the quotation alone, before any money moves.

Order release checks

Four things to see before you pay a deposit

1

Design verification fileTemperature rise and short-circuit test evidence for the assembly you are buying, not for a similar one.

2

Routine test reportDielectric, insulation resistance and functional checks against the serial number that ships.

3

Single-line diagram and layoutDimensioned drawings showing every compartment, cable entry and the spare ways you paid for.

4

Spare compartment priceOne drawer and its device quoted with the order, rather than after a failure on a Sunday night.

The fault level you design to comes from upstream. The main board sets the withstand, and a busbar cannot be uprated in place later. Confirm that figure with the utility or the transformer supplier before the order goes out.

Then look at the process behind the product. ISO 9001 with a current certificate number tells you the build is controlled from drawing to dispatch.

Industrial demand keeps climbing, and the International Energy Agency publishes that growth in its electricity reports year after year.

The board you compare today will be compared again in five years, and the file is what makes the second comparison quick.

Final thoughts

Compare formats on a worked example, then compare the file behind them. The cheaper quotation is the one that survives the fault level, the spare-way count and the test report. Send Giantele your single-line diagram and fault level for a side-by-side comparison.