Air Circuit Breakers
CHusul Air Circuit Breakers - CSW1 & CSW3 Series
Complete Range
CSW1 & CSW3 Series covering 200A to 8000A, frame sizes 1000AF to 7500AF, in 3P/4P configurations
High Breaking Capacity
Icu up to 150kA @ 400V, with fault clearing in ≤30ms before damage occurs
Wide Voltage Coverage
Standard AC 400/690V (CSW1), extended up to AC 1140V (CSW3) for mining, rail & special installations
Total Protection
Guards against overload, short circuit, earth fault, undervoltage, overvoltage & current-voltage imbalance
Intelligent Controllers
3 grades (IC5.0 / IC7.0 / IC8.0) with self-diagnosis, fault memory, thermal memory & functional test
Built-in Metering
Measures current, voltage, power, power factor, kWh, harmonics & demand — all in one device
Communication Ready
Modbus protocol for SCADA integration and "four-remote" function (remote monitoring, control, measurement & signalling)
Selective Category B
Zone interlocking ensures only the faulty section trips — no upstream blackouts in hospitals, data centers & process plants
Flexible Installation
Fixed & drawer types on all frames, horizontal/vertical wiring, usable as isolation switch
Long Service Life
Mechanical life up to 30,000 operations, zero arcing distance design
Certified Quality
IEC/EN 60947-2 compliant, CCC & CQC certified
No Unnecessary Blackouts
Selective protection with zone interlocking trips only the faulty section, keeping the rest of your plant running
Damage Prevented Before It Starts
30ms fault clearing protects transformers, cables, motors and downstream equipment from burnout
Lower Downtime, Higher Productivity
Fault memory and self-diagnosis pinpoint the problem instantly — no guesswork, faster restoration
Saves on Energy Monitoring Costs
Built-in metering (V, I, PF, kWh, harmonics) means no need for separate meters and analyzers at the incomer
Remote Control, Less Manpower
Modbus/SCADA integration lets your team monitor and operate breakers from the control room — no panel visits
One Family, Every Rating
200A to 8000A in a single product range simplifies procurement, spares and panel standardization
Longer Service Life, Lower Maintenance
Up to 30,000 mechanical operations and zero arcing distance design reduce replacement and servicing costs
Future-Proof for New Energy
Auto reclosing for solar/PV projects means the same breaker works in your next green energy investment
Works in Harsh Conditions
Reliable operation from -40°C to +70°C and high-altitude compliance — no derating surprises
Peace of Mind, Globally Certified
IEC/EN 60947-2, CCC & CQC certifications ensure bankable quality for consultants and project approvals.
Power Stations & Substations
Main incomer and bus coupler protection; overload, undervoltage and short-circuit protection for generators
Large Factories & Industrial Plants
Transformer LV-side outgoing feeders, main distribution boards for continuous-process industries
Intelligent Buildings & Commercial Complexes
Main LV switchboards, riser feeders in high-rise buildings, malls and office towers
Data Centers
Selective protection with zone interlocking ensures uninterrupted power to critical IT loads
Hospitals, Airports & Metros
Critical infrastructure where unnecessary tripping is not an option — precise selective protection keeps supply continuous
Mining & Special Installations
CSW3 series with AC 800–1140V rating for high-voltage industrial and mining networks
New Energy / Solar (PV) Projects
Auto reclosing function designed for photovoltaic applications
Motor & Generator Protection
Direct overload, undervoltage and short-circuit protection; suitable for infrequent starting of large motors and DG sets
Power Grid Monitoring
Doubles as a measurement node — current, voltage, power, frequency, energy, demand & harmonics at the grid point
Isolation Duty
Can be used as an isolation switch (with isolation function symbol) when supplied without an intelligent controller.
