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ACB duty
Main incomer, bus coupler or high-current feeder
Air Circuit Breakers (ACB)
Product detail
Product snapshot
Air Circuit Breakers (ACB)
Main LV incomer and bus-coupler ACBs for high-current switchboards up to 6300A class.
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Trip unit
LSIG protection, metering and communications
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Continuity
Fixed or withdrawable service strategy
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Verify
Fault level, selectivity and routine test evidence
Current class
800A - 6300A ACB incomer, feeder or bus coupler duty
Trip unit
LSIG, earth fault, metering and communication options
Build format
Fixed or withdrawable, interlocked and form-segregated
Use case
MDB intake, generator incomer, bus section and critical LV power
Read more
High-capacity air circuit breaker incomers, bus couplers and main outgoing feeders for large LV switchboards, hospitals, malls, factories, data centres and infrastructure sites in Kenya.
Nairobi Power Engineers designs and manufactures the assembly around site duty, prospective fault level, installation access, service continuity, cable entry and maintainability. The supply can be configured with ABB, Schneider Electric or CHINT equipment according to duty, lead time and lifecycle support.
ACB selections are documented with incomer rating, prospective fault level, trip-unit functions, withdrawable/fixed format, bus coupler logic, interlocks, metering and selectivity evidence.
- ACB incomers and bus couplers for main switchboards and MDBs
- Fixed or withdrawable ACB compartments with mechanical and electrical interlocks
- Electronic trip units for overload, short-circuit, earth-fault, selectivity and metering functions
- Main power continuity planning for generator, utility, UPS and bus-section architectures
- Rated current, fault level and service-continuity requirement
- Fixed or withdrawable form, bus coupler logic and interlocks
- Trip-unit protection functions, metering and communication requirements
- Selectivity study, busbar rating, cable entry and routine verification pack
OEM selection basis
ABB, Schneider Electric and CHINT fit where they genuinely belong.
- ABB SACE Emax 2 and digital trip units for premium high-current protection.
- Schneider MasterPact MTZ for connected main incomers and selective coordination.
- CHINT NA8 ACBs for cost-effective IEC main switchboard incomers.
- NPE selection basis: ACBs serve large-switchboard short-circuit and overload protection, typically 800A to 6300A class.
Technical detail library
Product Range & Target Markets, Switchboard Features and Options:
ACB rows only: incomers, bus couplers, withdrawable cassettes, electronic trip units, interlocks and main-board accessories. Open the cards for ratings, source basis, build options and direct contact links.
Engineering Calculator
Instant Technical Sizing
Enter parameters for real-time IEC/KPLC-standard sizing. Results update dynamically.
Sizing results
Design Current
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Recommended Breaker
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Recommended Type
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Copper Cable Size
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* For reference only. NPE engineering verifies configurations prior to build.
Frequently Asked Questions
What is included in Air Circuit Breakers (ACB)?
Our Air Circuit Breakers (ACB) solutions are custom-engineered and assembled locally at our Baricho Road workshop in Nairobi. A standard build includes high-quality modular enclosures, premium copper busbars (rated for local environmental conditions), type-tested circuit breakers or control elements from trusted global partners (ABB, Schneider Electric and CHINT), and comprehensive routine test certifications before delivery.
Which standards and ratings should be confirmed?
All assemblies comply with KEBS and EPRA regulations. You should confirm the required operational voltage (typically 415V three-phase or 240V single-phase in Kenya), rated current, prospective fault levels (e.g., 35kA or 50kA as per KPLC system requirements), form of separation (up to Form 4b), IP rating (IP31 indoor / IP54 for dust-heavy sites), and cable entry orientation (top or bottom entry).
How does NPE choose the product architecture?
NPE starts with the single-line diagram, load schedule and operating sequence, then selects the circuit protection path, device families, enclosure format, controls and testing requirements.
What information does NPE need to quote Air Circuit Breakers (ACB)?
Send the single-line diagram, load schedule, incoming supply details, fault level if known, preferred OEM brand, cable entry direction, installation environment and delivery location.
Can NPE supply ABB, Schneider Electric and CHINT options?
Yes. NPE can quote ABB, Schneider Electric, CHINT or a mixed-OEM architecture according to rating, availability, monitoring requirement, lifecycle support and budget.
Can the system include monitoring and remote signals?
Yes. Metering, alarms, Modbus, Ethernet, BMS contacts, SCADA points and commissioning checks can be included where the selected product family supports them.
Product enquiry
Do you have a Air Circuit Breakers (ACB) enquiry? Get in touch...
Use the calculators for a first-pass engineering check, then send us the SLD and load schedule for a project-ready selection.
24/7 Emergency Support
Electrical service you can count on
When air circuit breakers equipment fails, you need fast, reliable help from experienced engineers. We offer around-the-clock emergency support across Nairobi and East Africa — keeping your plant safe and powered, day or night. Whether it is an urgent breakdown or a scheduled repair, our team is ready to respond whenever you need us.
Cost and Estimates
Air Circuit Breaker costs vary significantly depending on several key factors. Here is what you need to know to make informed decisions and avoid unexpected expenses.
What Affects the Cost?
The price of a Air Circuit Breaker package depends on the load schedule, fault level, enclosure form and IP rating, plus the OEM equipment you specify. Site conditions and delivery timelines also move the number.
Get a Detailed Estimate
Our engineers issue itemised quotations covering equipment, assembly, factory testing and delivery — no hidden fees. You know exactly what to expect before any work begins.
Smart Maintenance
Scheduled inspection, thermographic surveys and torque checks catch small issues early, helping you avoid major repairs. Planned maintenance extends system life and protects uptime.
Fast, Reliable Response
Whether it is a scheduled upgrade or an urgent call, our Nairobi workshop at Baricho Road responds quickly and gets the job done right — minimising downtime and keeping you safe.
When in doubt, put safety first
If you are ever unsure or feel unsafe around an energised assembly, do not take chances — call a licensed engineer. Safety always comes first. Feel free to contact us or give us a call.
+254 0737-944-014How to stay safe during an electrical emergency
Overheating or Burning Smell
Isolate the supply if it is safe to do so, keep people clear of the panel and call us immediately. A burning smell around an enclosure usually indicates a loose termination or an overloaded circuit and must never be left running.
Nuisance Tripping
Repeated tripping is a symptom, not the fault. It usually points to overload, an earth leakage path or a device sized incorrectly for the duty. We test the circuit, verify discrimination and correct the root cause rather than resetting the device.
Safe Isolation and Access
Only competent, authorised personnel should open a live assembly. Follow lock-off and permit-to-work procedures, and use the correct PPE and rated test equipment for the fault level of the installation.
Routine Inspection Intervals
We recommend periodic inspection and testing in line with the KS/IEC regime for your installation category, with thermographic scanning on critical boards. We can hold the schedule for you and report against it.