When you are designing or upgrading an industrial or commercial power system, choosing the right miniature circuit breaker is a big part of keeping equipment safe and uptime high. The BBC S213-K10A circuit breaker is a compact, three‑pole solution built exactly for this purpose, balancing robust protection, global approvals, and easy DIN‑rail mounting in modern control panels. In this guide, we’ll walk through what the BBC S213-K10A circuit breaker is, how it works, the technical details that matter, and where it fits best in real‑world applications.
By the end, you’ll understand how the BBC S213-K10A circuit breaker protects three‑phase branch circuits, why its K‑curve trip characteristic is useful for certain loads, how to install it correctly, and which accessories and variants you can pair it with for a complete, future‑proof solution.
BBC S213-K10A Circuit Breaker: At a Glance
The BBC S213-K10A circuit breaker is part of the well‑known S200 series of miniature circuit breakers originally developed under the BBC/ABB brand for industrial and commercial installations. It’s a 3‑pole breaker designed for three‑phase AC systems operating at around 380 VAC, with a 10 A thermal‑magnetic rating and a 10 kA interrupting capacity at that voltage level.
Because the BBC S213-K10A circuit breaker uses a K‑curve trip characteristic, it is particularly well suited to loads with higher inrush currents, such as motors, transformers, or inductive control circuits. At the same time, it’s compact enough to fit comfortably on standard 35 mm DIN rails in distribution boards and control panels where space is often at a premium.
Physically, the BBC S213-K10A circuit breaker is built as three joined poles, each roughly 85 mm high, 58 mm deep, and 17.5 mm wide, which gives the full three‑pole unit a width of about 52.5 mm across the rail. This compact footprint makes it easy to line up with other protection and control devices on the same DIN rail.
Key Technical Specifications of the BBC S213-K10A Circuit Breaker
For engineers, maintenance teams, and panel builders, the real value of the BBC S213-K10A circuit breaker lies in the details of its technical specifications. Understanding these ratings helps you correctly size and apply the device in three‑phase systems without overspecifying or risking nuisance tripping.
Electrical ratings
At its core, the BBC S213-K10A circuit breaker is rated for 380 VAC three‑phase operation. It uses a 10 A thermal‑magnetic rating, which means it can carry 10 A continuously at its rated ambient conditions, while also providing both overload and short‑circuit protection. The 10 kA interrupt capacity (under UL 489 and CSA 22.2 No. 5 test conditions) means it can safely interrupt fault currents up to 10,000 A without catastrophic failure, which is crucial in many industrial distribution systems.
On the IEC side, breakers from this S200‑series family typically carry higher interrupt ratings under IEC/EN 60947‑2, often around 25 kA depending on the exact model and test conditions. This reinforces that the BBC S213-K10A circuit breaker is built for demanding industrial environments where prospective fault currents can be significant.
Mechanical and physical properties
From a mechanical perspective, the BBC S213-K10A circuit breaker is designed for long‑term durability. Each pole weighs around 120 g, so the full three‑pole assembly is about 360 g. The enclosure provides IP20 protection, with finger‑safe terminals to minimise accidental contact with live parts during installation or maintenance. This helps keep the BBC S213-K10A circuit breaker safe for panel technicians even in densely packed distribution boards.
The breaker is housed in a moulded case that meets standard dimensions for miniature circuit breakers, allowing it to integrate smoothly into existing layouts. Its operating handle provides clear ON/OFF indication and is designed to be easy to operate even in gloves, which is helpful in industrial settings where the BBC S213-K10A circuit breaker may be operated frequently.
Terminals and wiring
The input and output terminals of the BBC S213-K10A circuit breaker are designed for copper conductors in the 2.5–25 mm² range. They use clamping contacts with a recommended tightening torque of around 2.0 Nm, which ensures reliable contact pressure without damaging the conductor. Following these wiring guidelines is key to maintaining the rated performance of the BBC S213-K10A circuit breaker over its lifetime.
Because the terminals are finger‑safe and support both solid and stranded copper, they are suitable for typical panel wiring practices, including the use of lugs or ferrules where required. The breaker can also be reverse‑fed in many applications, which adds flexibility when retrofitting panels or dealing with tight wiring layouts.
Environmental performance
The BBC S213-K10A circuit breaker is designed to operate in ambient temperatures from –25 °C to +60 °C, making it suitable for a wide range of industrial environments. When used within that range, its thermal‑magnetic trip characteristics remain within the specified tolerances, allowing the BBC S213-K10A circuit breaker to respond predictably to overloads and faults.
The breaker’s mechanical and electrical endurance is typically rated at around 20,000 operations under rated load for similar S200‑series devices. This gives confidence that the BBC S213-K10A circuit breaker can handle frequent switching and fault conditions over many years.
How the K‑Curve Trip Works in the BBC S213-K10A Circuit Breaker
One of the defining features of the BBC S213-K10A circuit breaker is its K‑curve trip characteristic. This curve defines how the breaker responds to overcurrent and short‑circuit conditions, and it’s a major factor in deciding where and how to apply this device.
A thermal‑magnetic breaker like the BBC S213-K10A circuit breaker combines two trip mechanisms:
- Thermal trip (overload protection) – A bimetal strip reacts to sustained overcurrents. As current exceeds the rated 10 A over time, the strip heats and bends, eventually triggering the trip mechanism. This protects against overloads such as oversized loads, mechanical binding in motors, or long‑term overloading of cables.
- Magnetic trip (short‑circuit protection) – An electromagnetic coil responds to very high fault currents almost instantly. When a short circuit occurs, the BBC S213-K10A circuit breaker trips in milliseconds, preventing serious damage to wiring and connected equipment.
With a K‑curve, the magnetic trip threshold is higher than in standard B‑ or C‑curve breakers. This allows the BBC S213-K10A circuit breaker to tolerate higher inrush currents commonly seen in motors, transformers, and inductive control circuits without nuisance tripping. At the same time, it still reacts quickly to true short‑circuit conditions.
In practical terms, using a BBC S213-K10A circuit breaker on motor feeders or inductive loads means you can size the breaker to match the continuous current while still giving the load room to start up. This helps minimise downtime caused by unnecessary trips, especially in automated processes where momentary power loss can be costly.
Standards, Compliance, and Global Approvals
When specifying protection devices, compliance with global standards is non‑negotiable. The BBC S213-K10A circuit breaker carries multiple approvals that make it suitable for use in many regions without extra testing or adaptation.
Under North American standards, the BBC S213-K10A circuit breaker is UL 489 listed as a branch circuit breaker and CSA C22.2 No. 5 certified. These approvals confirm its ability to safely interrupt its rated fault current and perform reliably as a branch circuit protective device in North American installations.
On the international side, the BBC S213-K10A circuit breaker conforms to IEC/EN 60947‑2, the standard for low‑voltage circuit breakers used in industrial applications. Breakers in this S200 family often carry IEC interrupt ratings up to around 25 kA, giving additional safety margin in high‑fault‑level environments.
The device is also CE marked for use in the European Union and typically meets RoHS requirements regarding hazardous substances. Together, these approvals ensure that the BBC S213-K10A circuit breaker can be designed into equipment and panels intended for global markets without needing separate breaker designs for each region.
For panel builders, OEMs, and system integrators, this means one core product—the BBC S213-K10A circuit breaker—can form part of a global design standard across multiple facilities and countries, simplifying procurement, documentation, and maintenance.
Mounting the BBC S213-K10A Circuit Breaker on DIN Rail
From an installation perspective, the BBC S213-K10A circuit breaker is built for quick and reliable mounting on standard DIN rails, which are ubiquitous in modern switchboards and control panels.
DIN‑rail mounting
The BBC S213-K10A circuit breaker is designed for 35 mm top‑hat DIN rail (EN 60715), the most common rail profile in industrial enclosures. The breaker simply clips onto the rail with a snap‑on mechanism. This makes it easy to add, remove, or rearrange the BBC S213-K10A circuit breaker during panel assembly or upgrades without needing custom brackets.
You can mount the BBC S213-K10A circuit breaker vertically or horizontally, giving you flexibility in tight panels and distribution boards. Regardless of orientation, the internal mechanisms are designed to operate correctly within the specified temperature range, so the protective characteristics of the BBC S213-K10A circuit breaker are preserved.
Wiring and terminations
When wiring the BBC S213-K10A circuit breaker, follow standard best practices for copper conductors. Ensure the conductor size is within the 2.5–25 mm² range and that the insulation is stripped correctly so no bare copper extends beyond the terminal.
Insert the conductor fully into the clamping terminal and tighten to approximately 2.0 Nm of torque (or per the manufacturer’s recommendation). This torque level ensures a reliable electrical connection while preventing damage to the conductor or terminal. It also helps the BBC S213-K10A circuit breaker maintain its rated thermal performance by minimising hot spots at the terminals.
Because the terminals are finger‑safe and accept common lug types, wiring the BBC S213-K10A circuit breaker is straightforward for experienced electricians. Always ensure all three poles are wired consistently to the three phases, and confirm that neutral and earth conductors are managed according to your panel design and standards.
Panel layout considerations
In dense panels, planning the layout around the BBC S213-K10A circuit breaker can make future maintenance much easier. Group related breakers together—for example, all motor feeders using K‑curve devices—so troubleshooting is faster.
Leave enough space for accessories such as auxiliary contacts or shunt‑trip modules, which may clip onto the side or front of the BBC S213-K10A circuit breaker. Also consider adjacent heat‑generating devices; while the breaker is rated up to +60 °C ambient, good ventilation and spacing help prolong life and maintain consistent tripping behaviour.
Where the BBC S213-K10A Circuit Breaker Fits Best
The BBC S213-K10A circuit breaker is not a general‑purpose household device; it is designed for industrial and commercial three‑phase circuits. Understanding where it shines will help you decide whether it’s the right choice for your project.
Industrial power distribution
In industrial settings, the BBC S213-K10A circuit breaker is a solid fit for three‑phase branch circuits feeding machinery, sub‑panels, or process equipment. Its 10 kA interrupt rating and K‑curve behaviour make it suitable for circuits with higher prospective fault currents and inrush‑heavy loads.
Examples where the BBC S213-K10A circuit breaker can be used include:
- Motor control centres (MCCs) for small to medium motors that require reliable short‑circuit protection and tolerant starting behaviour.
- Process control panels where relays, solenoids, and small drives may draw inrush current.
- Manufacturing lines with mixed inductive and resistive loads, where selective coordination and minimal nuisance tripping are important.
Commercial and building services
In commercial buildings, the BBC S213-K10A circuit breaker can be used in distribution boards supplying specific three‑phase loads such as HVAC units, pumps, or specialised equipment. Its compact size allows multiple breakers to be installed side by side in confined distribution enclosures.
The combination of IP20 protection and global approvals makes the BBC S213-K10A circuit breaker a good candidate in buildings that must comply with both IEC and UL‑style standards—for example, multinational facilities or projects with imported equipment.
OEM equipment and machinery
For OEMs who build machines or prefabricated panels, using the BBC S213-K10A circuit breaker as part of a standardised design can simplify documentation and streamline certification. Because the breaker is part of a larger family with multiple current ratings, OEMs can scale the protection up or down by choosing related S200‑series models without redesigning the entire layout.
In this context, the BBC S213-K10A circuit breaker often acts as the primary three‑phase protective device for control transformers, auxiliary drives, or specialised subsystems within a machine.
Comparing the BBC S213-K10A to Variants and Alternatives
While the BBC S213-K10A circuit breaker is a strong fit for many circuits, it’s part of a broader family of S200‑series devices. Understanding its place within that range helps you choose the right rating for each application.
Higher and lower current ratings
If your application requires more current than the 10 A rating of the BBC S213-K10A circuit breaker, you might consider alternatives such as the S213-K16A (16 A, 3‑pole) or even S213-K20 (20 A, 3‑pole), which share similar mechanical form factors but are sized for higher loads.
Conversely, if you are protecting very small loads, the S213-K6A variant (6 A, 3‑pole) may be more appropriate. These related models maintain the same K‑curve behaviour, DIN‑rail mounting, and basic dimensions, so swapping between them is usually as simple as exchanging the breaker and adjusting wiring.
In all cases, the same general characteristics that make the BBC S213-K10A circuit breaker useful—compact size, strong interrupt ratings, and wide approvals—also apply across the series, allowing a consistent design philosophy throughout your panel.
Different pole configurations
Not every circuit requires three phases. In applications where you only need to protect single‑phase or two‑wire loads, 1‑pole and 2‑pole variants can be more appropriate than the BBC S213-K10A circuit breaker.
For example:
- S212‑K10A: a 2‑pole, 10 A K‑curve breaker for two‑phase or split‑phase circuits.
- S211‑series: single‑pole versions for single‑phase applications where the BBC S213-K10A circuit breaker’s three‑pole design would be excessive.
Using the right number of poles helps match cost and space usage to the actual circuit needs while still leveraging the same S200‑series platform.
When to stick with the BBC S213-K10A
Despite the availability of alternatives, there are many cases where the BBC S213-K10A circuit breaker is precisely the right choice:
- The load is three‑phase and draws around 10 A nominal.
- Inrush currents make K‑curve behaviour beneficial.
- The prospective short‑circuit current is within the breaker’s 10 kA (UL) or 25 kA (IEC family) rating.
- DIN‑rail space is limited, and a compact solution is required.
When these conditions align, the BBC S213-K10A circuit breaker offers an efficient, globally approved, and easy‑to‑install option.
Accessories That Expand the BBC S213-K10A’s Capabilities
A major advantage of using a modular miniature breaker platform is the ability to add plug‑on accessories. The BBC S213-K10A circuit breaker supports a variety of add‑ons that extend its functionality beyond simple overcurrent protection.
Auxiliary and alarm contacts
You can attach auxiliary contact blocks to the BBC S213-K10A circuit breaker to signal the breaker’s ON or OFF status to external systems. A common module provides 1 NO + 1 NC contact, which can be wired into PLC inputs, monitoring relays, or indication lamps.
For fault indication, alarm or bell contacts are also available. These contacts typically change state only when the BBC S213-K10A circuit breaker trips due to a fault, allowing you to distinguish between a manually switched OFF state and an automatic trip.
Shunt‑trip releases
In applications where you need remote disconnection—for example, emergency stop systems, fire alarm integration, or remote isolation from a control room—you can fit a shunt‑trip release to the BBC S213-K10A circuit breaker. These modules are available with a range of coil voltages (e.g., 12–60 VDC or 110–415 VAC), so they can interface easily with control power systems.
Energising the shunt‑trip coil forces the BBC S213-K10A circuit breaker to open, providing a simple yet effective method for coordinated safety or emergency shutdown.
Mechanical interlocks and busbars
For changeover or transfer applications, you can use mechanical interlocks to ensure that two breakers cannot be ON simultaneously. When combined with the BBC S213-K10A circuit breaker, these interlocks support safe manual changeover schemes between supply sources or loads.
Busbar kits are also available to simplify the linking of multiple S200‑series breakers. Instead of using individual jumpers, a three‑phase busbar can connect feeds across several BBC S213-K10A circuit breakers and their companions, improving panel appearance and reducing wiring errors.
Handles and operating covers
Optional handles, door‑coupling mechanisms, and covers allow you to operate the BBC S213-K10A circuit breaker from outside an enclosure, or to provide extra protection against accidental operation. These accessories are particularly helpful in MCCs and large switchboards where breakers are mounted behind doors or in compartmentalised sections.
Because accessories are standardised across the S200 family, you can mix and match them across breakers of different ratings, including the BBC S213-K10A circuit breaker, which helps with inventory management and spare parts stocking.
Maintenance, Troubleshooting, and Service Life
Even though miniature circuit breakers are generally low‑maintenance devices, it’s still worth understanding how to look after the BBC S213-K10A circuit breaker so it continues to protect your system effectively over time.
Routine checks
Regular visual inspections are the first step. Confirm that the BBC S213-K10A circuit breaker is seated firmly on the DIN rail, that terminals are secure, and that there is no visible damage, discolouration, or signs of overheating around the terminals or case.
It’s also good practice to periodically check terminal torque, especially in high‑vibration environments. Re‑tightening to the recommended 2.0 Nm helps maintain low contact resistance and prevents overheating. Where possible, record inspection dates and any observations, particularly for panels with multiple BBC S213-K10A circuit breakers in critical circuits.
Understanding nuisance trips
If you experience unexpected tripping with a BBC S213-K10A circuit breaker, consider the following possibilities:
- Inrush currents higher than anticipated. Even though the K‑curve tolerates inrush, some loads may still demand a higher rating or a different curve.
- Ambient temperature above +60 °C or poor ventilation near the breaker, which can accelerate thermal tripping.
- Loose or undersized conductors causing localised heating at the terminals.
Measuring inrush current and checking wiring can help determine whether the BBC S213-K10A circuit breaker is correctly sized. In some cases, moving to a higher current rating within the same family (such as S213‑K16A) while staying within cable and equipment ratings may solve issues.
End of life considerations
Like all mechanical devices, the BBC S213-K10A circuit breaker has a finite service life, typically measured in mechanical and electrical operations. For S200‑series devices, a ballpark figure of around 20,000 operations at rated load is common. While many breakers will last longer in real installations, heavy switching duty or repeated fault interruptions will shorten life.
Signs that a BBC S213-K10A circuit breaker may be approaching end of life include excessive handle looseness, inconsistent tripping behaviour, or visible damage. In such cases, replacement is usually the best option, especially given the relatively low cost compared to the potential consequences of protective failure.
Related Protection & Distribution Product Collections
If you are planning or upgrading a panel around the BBC S213-K10A circuit breaker, it often helps to review related protection and distribution gear that complements this breaker in real‑world installations:
- Circuit Breakers ➜
Explore a wide range of miniature, moulded‑case, and specialist circuit breakers from trusted brands to protect other branch circuits alongside your BBC S213-K10A circuit breaker. - Fuses & Holders ➜
Find complementary fuse links, bases, and modular holders for fine‑tuned overcurrent and backup protection in motor circuits, control panels, and distribution boards. - Busbar ➜
Browse busbars and accessories that simplify power distribution, reduce wiring complexity, and help you build cleaner, easier‑to‑service panels around your BBC S213-K10A circuit breaker.
Conclusion: Putting the BBC S213-K10A Circuit Breaker to Work
In modern industrial and commercial power systems, protection devices have to do more than just trip on faults—they must integrate cleanly into global standards, tolerate demanding loads, and fit into increasingly compact panels. The BBC S213-K10A circuit breaker delivers on these needs with its 3‑pole 380 VAC rating, 10 A thermal‑magnetic protection, strong interrupt capacity, and flexible K‑curve behaviour.
By understanding its technical characteristics, installation requirements, accessories, and ideal applications, you can use the BBC S213-K10A circuit breaker as a dependable building block in motor control centres, distribution boards, OEM machinery, and more. If you are currently reviewing protection options for a three‑phase circuit around this rating, it’s worth taking a closer look at the BBC S213-K10A circuit breaker and confirming how its specifications align with your project’s needs.
For engineers and maintenance teams planning their next upgrade or new build, exploring the full product details, dimensional data, and availability on the dedicated product page is a simple next step that can help ensure the BBC S213-K10A circuit breaker is configured and applied exactly as intended.
