Switchgear vs switchboard vs panelboard — the short answer: all three distribute and protect electrical power, but they differ in size, ratings and construction. Switchgear is the heaviest-duty: compartmented, often with draw-out power circuit breakers and separate protection relays, built for high fault currents and medium voltage. A switchboard is a free-standing low voltage assembly that distributes power from the main service to large feeders. A panelboard is a smaller, usually wall-mounted board feeding final branch circuits such as lighting and sockets.
Walk into any electrical distribution project meeting and you will hear these three terms used almost interchangeably. An architect will call it a panel. A contractor will say switchboard. An electrical engineer will specify switchgear. Sometimes they are all talking about the same piece of equipment. Often they are not — and that confusion has real consequences on projects.
Using the wrong term in a specification leads to the wrong equipment being quoted, the wrong fault current rating being assumed, the wrong access clearances being planned, and occasionally a failed inspection because what got installed does not meet the code requirement for the application. These are not minor administrative errors. They cost money, time, and in worst cases they create genuine safety risks in the finished installation.
This article draws a clear line between switchgear, switchboard, and panelboard — what each one actually is, what standards govern each, where each one belongs in a power distribution system, and how to choose the right equipment for your specific project.\
Why the Confusion Exists in the First Place
All three are metal-enclosed assemblies. All three contain busbars, protective devices, and field wiring terminations. At drawing level, they can all look like an electrical panel, and vendor literature often mixes terms like distribution board, service equipment, and main distribution frame without distinction.
The confusion is understandable. But the National Electrical Code, or NEC, does not treat them as casual synonyms. Article 408 separates the provisions for switchboards, switchgear, and panelboards because their construction, access requirements, and intended applications are different. International standards under IEC 61439 make similar distinctions for the global market. The equipment in each category is designed, tested, and listed under different standards — and those standards set very different requirements for fault current performance, breaker type, and physical construction.
What Is Switchgear?
Definition and Standards
NEC Article 100 defines switchgear as an assembly completely enclosed on all sides and top with sheet metal — except for ventilating openings and inspection windows — containing primary power circuit switching and interrupting devices, with buses and connections. Access to the interior is provided by doors or removable covers.
In the United States, low-voltage power circuit breaker switchgear is listed under UL 1558 and meets ANSI standard C37.20.1 and NEMA standard SG-5. In international projects governed by IEC standards, low-voltage switchgear assemblies fall under IEC 61439-2.
Physical Characteristics
Switchgear is the largest and most robust of the three. It is typically rated for voltages up to 38kV at the high voltage end and handles current ratings from 1,600A up to 6,000A in low-voltage power circuit breaker configurations. The defining physical characteristic is that each circuit breaker sits in its own individual compartment, fully segregated from adjacent breakers by grounded metal barriers.
The breakers used in switchgear are draw-out type power circuit breakers — open-frame devices that can be withdrawn from their compartment on a trolley or rail mechanism without de-energising adjacent circuits. This draw-out feature is what makes switchgear maintainable and testable in a way that switchboards and panelboards are not. You can remove a breaker for maintenance while the rest of the assembly remains in service.
Because each breaker is in its own compartment, switchgear is rated to withstand a short-circuit condition for up to 30 cycles. Panelboards and switchboards are only rated to withstand a short-circuit condition for up to three cycles. That is a tenfold difference in fault energy containment capability, and it is the primary reason switchgear is specified for applications with high available fault currents.
Where Switchgear Is Used
Switchgear is used as the primary service equipment in large commercial buildings, hospitals, data centres, industrial facilities, water treatment plants, oil and gas facilities, and utility substations where the available fault current at the service entrance is high and the consequence of a fault propagating beyond the faulted circuit is unacceptable.
At Danli, our low-voltage switchgear assemblies are manufactured under IEC 61439-2 for industrial clients in water treatment, metallurgy, oil and gas, and power distribution applications. The fully compartmentalised construction, draw-out circuit breaker capability, and high short-circuit withstand ratings make our assemblies suitable for the most demanding power distribution environments our clients work in.
What Is a Switchboard?
Definition and Standards
The NEC defines a switchboard as a large single panel, frame, or assembly of panels on which are mounted — on the face, back, or both — switches, overcurrent and other protective devices, buses, and usually instruments. These assemblies are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets.
In the United States, switchboards are listed under UL 891 and meet NEMA standard PB-2. Internationally, switchboard-type assemblies typically fall within the IEC 61439-1 and IEC 61439-2 framework depending on their application and construction.
Physical Characteristics
The dielectric test voltage applied to switchboards is two times the rated voltage plus 1,000V — the same requirement as panelboards. Switchgear is tested to 2,200V regardless of rated voltage, which is a more demanding dielectric requirement.
Switchboards are simpler in construction than switchgear. They do not require individual compartmentalisation of each circuit breaker. The breakers used in switchboards are moulded case circuit breakers, insulated case circuit breakers, or in larger ratings, power circuit breakers — but these are typically fixed-mounted rather than draw-out. Fixed-mounted breakers cannot be removed from the assembly without de-energising the section they are installed in.
Switchboards can have main current ratings from small distribution sizes up to around 5,000A. They can include panelboards and transfer switches within the same assembly, which switchgear cannot accommodate. Modern switchboards often provide front access only, though larger assemblies with deeper sections may require rear access as well.
Where Switchboards Are Used
Switchboards are the workhorse of medium to large commercial and light industrial power distribution. Office buildings, retail facilities, light manufacturing operations, educational institutions, and healthcare facilities typically use switchboards at their main service entrance or at distribution points feeding multiple downstream panelboards.
They offer a practical middle ground — more capable than a panelboard for high-current applications, less expensive and complex than full switchgear for locations where available fault currents are within the switchboard’s rated short-circuit current capability. Short-circuit current ratings for switchboards typically range from 42kA to 100kA depending on the assembly rating and breaker selection.
What Is a Panelboard?
Definition and Standards
A panelboard is a single panel or group of panel units designed for assembly in a cabinet or cutout box that is placed in or against a wall or partition and accessible only from the front. It contains buses, with or without switches, and automatic overcurrent devices for the control and protection of light, heat, or power circuits.
In the United States, panelboards are listed under UL 67 and covered by NEMA standard PB-1. The maximum main overcurrent device rating for a standard panelboard is 1,200A. Panelboards are branch circuit distribution equipment by design — they are the final distribution point before individual loads.
Physical Characteristics
Panelboards are the most compact of the three. They are flush-mounted or surface-mounted on walls, accessible only from the front, and designed to fit within standard wall cavity dimensions or surface enclosures. The breakers are moulded case circuit breakers — sealed devices rated from 15A up to around 1,200A.
Because panelboards are not individually compartmentalised and use moulded case breakers rather than draw-out power circuit breakers, their short-circuit withstand capability is limited. Standard panelboard short-circuit current ratings typically run from 10kA up to 65kA with series ratings, compared to 65kA to 200kA for switchgear. The three-cycle fault withstand rating versus switchgear’s 30-cycle rating reflects this construction difference directly.
Where Panelboards Are Used
Panelboards are found at the final distribution level in virtually every building and facility — residential, commercial, and industrial. They feed lighting circuits, small power outlets, HVAC equipment, and other branch circuits. In large facilities, multiple panelboards are fed from a main switchboard or switchgear assembly.
In smaller facilities, a panelboard may serve as the primary service equipment where the available fault current at the service entrance is low enough to fall within the panelboard’s rated capability and the total connected load does not exceed its 1,200A main rating.
Switchgear vs Switchboard vs Panelboard: Key Differences at a Glance
| Feature | Switchgear | Switchboard | Panelboard |
|---|---|---|---|
| Typical voltage | LV up to 1 kV and MV up to about 38–40.5 kV | LV only (up to 600 V in North America, 1 kV under IEC) | LV only |
| Breaker type | Draw-out power circuit breakers (ACB/VCB) | Moulded-case and insulated-case breakers, some draw-out | Small moulded-case or miniature breakers |
| Fault (short-circuit) rating | Highest; designed to withstand faults for a set time | Medium | Lowest |
| Construction | Compartmented, barriers between sections | Free-standing, front or rear access | Enclosed cabinet, usually wall-mounted |
| North American standard | UL 1558 / IEEE C37.20.1 (LV); IEEE C37.20.2 (MV) | UL 891 | UL 67 |
| IEC equivalent | IEC 61439-2 (LV); IEC 62271-200 (MV) | IEC 61439-2 | IEC 61439-3 |
| Relative cost | Highest | Medium | Lowest |
Voltage and Current Ratings
Switchgear handles the widest voltage range — from low voltage at 600V up to 38kV for medium voltage equipment — and the highest current ratings up to 6,000A. Switchboards operate at low voltage up to 600V with main ratings up to around 5,000A. Panelboards operate at low voltage with a maximum main device rating of 1,200A.
Circuit Breaker Types
This is one of the most practical differences between the three. Switchgear uses draw-out low-voltage power circuit breakers — open-frame devices that can be individually removed for maintenance. Switchboards use a mix of moulded case circuit breakers, insulated case circuit breakers, and fixed-mounted power circuit breakers depending on the rating. Panelboards use moulded case circuit breakers only.
The type of breaker directly determines maintainability, short-circuit capability, and the ability to perform circuit maintenance under partial de-energisation.
Short-Circuit Withstand
Switchgear withstands short-circuit conditions for 30 cycles. Switchboards and panelboards withstand short-circuit conditions for only three cycles. In locations with high available fault currents — large commercial service entrances, industrial facilities close to utility transformers, and distribution points with low impedance supply paths — this difference is critical for protecting both the equipment and the people working around it.
Access Requirements
Switchgear generally requires both front and rear access, which means clear working space must be maintained on both sides of the assembly. Switchboards may require rear access for larger assemblies but modern designs are often front-access only. Panelboards require front access only and can be mounted flush against a wall with no rear clearance requirement.
Cost
Cost follows capability closely. Panelboards are the least expensive of the three, switchboards fall in the middle, and switchgear carries the highest cost per assembly. As a rough order of magnitude for low-voltage equipment at an 800A class rating, panelboards typically range from a few thousand dollars, switchboards from tens of thousands, and switchgear from tens of thousands up to several hundred thousand dollars for large, fully specified assemblies.
Read More: Types of Electrical Switchgear
How to Choose Between the Three
Choose Switchgear When
The available fault current at the installation point exceeds what a switchboard can safely handle. You need draw-out circuit breakers for maintainability without full de-energisation. The application is critical infrastructure — a hospital, data centre, water utility, oil and gas facility, or large industrial plant — where fault containment and operational continuity are primary requirements. The current rating exceeds 1,600A and the installation justifies the higher cost of a fully compartmentalised, draw-out assembly.
Choose a Switchboard When
The available fault current is within the switchboard’s short-circuit current rating. The current rating is between 1,200A and 5,000A at low voltage. The installation is a medium to large commercial building, light industrial facility, or distribution point feeding multiple downstream panelboards. You need to incorporate panelboard sections or a transfer switch within the same assembly.
Choose a Panelboard When
The installation is a branch circuit distribution point feeding lighting, small power, or HVAC circuits. The total connected load is within the 1,200A maximum main device rating. The installation is a residential, commercial, or light industrial space where flush or surface wall mounting is appropriate and front access only is acceptable. The available fault current at the installation point is within the panelboard’s rated short-circuit current capability.
A Note on IEC Standards for International Projects
The NEC framework and UL standards described above apply primarily to projects in the United States. For international projects — including industrial facilities in Asia, the Middle East, Africa, and Europe — the equivalent framework is the IEC 61439 series.
IEC 61439 covers low-voltage switchgear and controlgear assemblies and provides equivalent distinctions between assembly types based on their construction, testing requirements, and application. IEC 61439-1 covers the general rules. IEC 61439-2 covers power switchgear and controlgear assemblies. IEC 61439-3 covers distribution boards.
At Danli, all low-voltage switchgear assemblies and distribution boards are designed and manufactured to IEC 61439 requirements and certified to CE, UL, and ISO 9001 standards. Our engineering team can support specification of the correct assembly type for any project, whether the governing standard is NEC, IEC, or a combination of both for international projects with mixed regulatory requirements.
Frequently Asked Questions
Duty level. Switchgear handles the highest currents and fault levels with compartmented, draw-out breakers; switchboards distribute low voltage power to large feeders; panelboards feed small branch circuits.
Only where the fault level, maintenance and selectivity requirements allow it. Critical facilities, large motors and high fault currents usually justify switchgear.
Broadly yes. “Panelboard” is the North American term; under IEC the same type of equipment is usually called a distribution board and is covered by IEC 61439-3.
Outside North America, low voltage assemblies are designed and verified to IEC 61439, and medium voltage switchgear to IEC 62271-200.
