| CATALOG NUMBER |
279123 |
| Manufacturer |
Eaton Moeller |
| Product Name |
Eaton Moeller series xEffect - FAZ-DC MCB |
| Catalog Number |
279123 |
| Model Code |
FAZ-C3/1-DC |
| EAN |
4015082791230 |
| Product Length/Depth |
80 mm |
| Product Height |
75.5 mm |
| Product Width |
17.7 mm |
| Product Weight |
0.112 kg |
| Compliances |
RoHS conform |
| Certifications |
IEC/EN 60947-2 |
Product Name
Eaton FAZ-C3-1-DC Miniature Circuit Breaker (279123)
Product Brief Introduction
Eaton 279123 FAZ-C3-1-DC is a single‑pole DC miniature circuit breaker from the xEffect FAZ‑DC series, rated at 3 A with C‑curve tripping. Designed exclusively for DC power distribution, it delivers precise thermal‑magnetic protection against overload and short‑circuit faults. It supports 250 V DC per pole, offers a 10 kA short‑circuit breaking capacity (IEC 60947‑2), and features standard 35 mm DIN‑rail mounting. With a compact 17.7 mm width, IP20 touch‑safe design, and an operating temperature range of ‑25 °C to +75 °C, it complies with IEC/EN 60947‑2, EN 45545‑2, IEC 61373 and RoHS, making it ideal for safe, space‑saving protection in low‑current DC systems.
Product Description
Eaton FAZ‑C3‑1‑DC (model 279123) is a high‑performance single‑pole direct‑current miniature circuit breaker engineered by Eaton Moeller as part of the xEffect FAZ‑DC series, built to deliver accurate and reliable overcurrent protection for low‑power DC distribution systems. Unlike standard AC breakers, this model is purpose‑built for DC circuits with an enhanced arc‑extinguishing system that addresses the inherent difficulty of suppressing DC arcs, which persist longer and pose greater fire and equipment damage risks. This optimization ensures safe and rapid fault interruption, even in continuous DC environments. It serves as a critical protection component across industrial automation, renewable energy, telecommunications, rail, marine, battery energy storage, and mobile DC power applications, delivering consistent performance under demanding electrical and environmental conditions. The product meets stringent international standards including IEC/EN 60947‑2 for low‑voltage switchgear, EN 45545‑2 for railway fire safety, IEC 61373 for shock and vibration resistance, and RoHS for environmental compliance, ensuring global applicability and reliability.
At its core, the FAZ‑C3‑1‑DC employs a precision‑calibrated thermal‑magnetic tripping mechanism tailored for DC operation. The thermal element uses a high‑quality bimetallic strip that gradually deforms under sustained overload currents, triggering a mechanical trip to protect cables, batteries, inverters, control modules, and connected loads from overheating, insulation degradation, and fire hazards caused by prolonged overcurrent. The electromagnetic element provides instantaneous response to severe short‑circuit faults, generating a powerful magnetic field that trips the breaker within milliseconds. This ultra‑fast action quenches DC arcs immediately, preventing catastrophic damage to wiring, semiconductors, and expensive equipment. The dual‑protection design ensures comprehensive coverage of both gradual overloads and sudden high‑energy short circuits, the two most common and dangerous DC electrical faults.
As a 1‑pole device, the FAZ‑C3‑1‑DC is intended for single‑line DC circuit protection, typically installed on the positive conductor of a DC loop to enable independent circuit isolation and fault management. It features a clear mechanical status indicator that displays ON or TRIPPED status at a glance, eliminating the need for test tools and enabling quick diagnostics by maintenance personnel. The ergonomic operating handle provides smooth, positive switching with distinct tactile feedback, while the trip‑free design prevents the breaker from being manually locked in the ON position during a fault, eliminating risks associated with forced operation.
With a rated current of 3 A and C‑type tripping characteristics, this breaker is well‑suited for DC loads with low‑to‑moderate inrush currents, such as small DC motors, fans, sensors, solar charge controllers, communication power supplies, UPS systems, and low‑power battery charging circuits. The C‑curve ensures stable operation without nuisance tripping during normal equipment startup, while maintaining sensitivity to genuine fault conditions. It supports a rated operational voltage of 250 V DC per pole, a rated insulation voltage of 440 V, and an impulse withstand voltage of 4 kV, providing robust resistance to voltage surges and transient interference common in industrial and outdoor environments. The short‑circuit breaking capacity of 10 kA ensures safe interruption of high‑magnitude fault currents, preventing system‑wide cascading failures and enhancing overall grid stability.
The breaker’s ultra‑compact 17.7 mm width (one standard module) enables high‑density installation in control panels, distribution boxes, and equipment enclosures where space is limited. It mounts quickly and tool‑free on standard 35 mm DIN rails, reducing assembly and maintenance time. The high‑strength thermoset housing offers excellent flame retardancy, mechanical durability, and electrical insulation, maintaining performance in harsh conditions including dust, humidity, vibration, and temperature fluctuations. It operates reliably across a wide ambient temperature range of ‑25 °C to +75 °C, adapting to outdoor cabinets, industrial workshops, vehicle‑mounted systems, and mobile equipment. The screw terminals accept solid and stranded conductors from 1 mm² to 25 mm², ensuring secure, low‑resistance connections. Additionally, the FAZ‑DC series supports a full range of accessories, including auxiliary contacts, alarm contacts, and shunt trips, for flexible functional expansion to meet monitoring, remote control, and safety interlock needs. Each unit undergoes rigorous factory testing for tripping accuracy, temperature rise, dielectric performance, and short‑circuit withstand to ensure consistent quality and reliability. As a RoHS‑compliant product, it aligns with green industrial practices while delivering professional‑grade DC circuit protection.
Product Advantages
Eaton FAZ‑C3‑1‑DC provides distinct advantages optimized for low‑current DC circuit protection, making it a reliable choice for modern industrial and commercial DC power systems. Its dedicated DC design incorporates advanced arc‑extinguishing technology that efficiently suppresses DC arcs, a critical safety feature that outperforms standard AC breakers used in DC applications and reduces fire and equipment damage risks.
The ultra‑compact single‑module width delivers exceptional space efficiency, allowing more circuits to be installed in limited panel space and supporting the trend toward miniaturized, high‑density power distribution. This is especially valuable in control cabinets, compact power boxes, and vehicle‑mounted systems where installation space is at a premium.
The robust thermal‑magnetic dual‑protection mechanism ensures comprehensive fault coverage. The thermal element guards against long‑term overload and overheating, while the electromagnetic element provides instantaneous short‑circuit protection to isolate faults before damage occurs. The C‑curve tripping profile balances stability and sensitivity, avoiding nuisance tripping during equipment startup while ensuring rapid response to real faults.
With a high breaking capacity of 10 kA at 250 V DC, this breaker safely interrupts large fault currents, protecting the entire DC distribution system from cascading failures and improving overall stability. The durable construction and wide operating temperature range of ‑25 °C to +75 °C ensure reliable performance in harsh environments with vibration, dust, humidity, and extreme temperatures.
User‑friendly features simplify installation, operation, and maintenance. DIN‑rail mounting enables quick, tool‑free installation, while the clear visual indicator allows instant status identification. High mechanical and electrical endurance ensures long service life and consistent performance, reducing replacement frequency and lifecycle costs.
Full compliance with IEC/EN 60947‑2, EN 45545‑2, IEC 61373, and RoHS standards ensures global applicability and environmental compatibility. Accessory compatibility supports functional expansion for remote signaling, automation control, and safety interlock systems. Backed by Eaton’s reputation for quality and reliability, this breaker delivers stable, long‑lasting protection for diverse low‑current DC applications.
Application Scenarios
Eaton FAZ‑C3‑1‑DC is widely deployed across numerous industries requiring dependable 3 A DC circuit protection, delivering safe and stable overcurrent and short‑circuit safeguarding for a variety of low‑power direct‑current systems.
In renewable energy systems, including small‑scale solar photovoltaic installations and low‑capacity energy storage systems, it protects solar panels, charge controllers, battery packs, and DC distribution circuits. Its DC‑optimized arc extinguishing ensures safe operation in both off‑grid and grid‑tied solar systems, preventing fire risks and equipment damage from overload or short circuit.
In telecommunications and data center power infrastructure, it provides reliable protection for low‑power DC power supplies, backup battery systems, rectifiers, and network equipment. Stable performance ensures uninterrupted operation of base stations, server rooms, and communication hubs, with fast fault isolation to avoid large‑scale power disruptions.
In industrial automation, it safeguards small DC motors, solenoid valves, sensors, and control circuits in conveyor systems, packaging machinery, and production lines. Its rugged build adapts to dusty, vibrating industrial environments, while rapid short‑circuit tripping protects valuable automation components.
In railway, automotive, and marine applications, it protects on‑board low‑power DC systems, lighting, control circuits, and auxiliary equipment. Compliance with EN 45545‑2 (railway fire safety) and IEC 61373 (shock and vibration resistance) ensures reliable operation under harsh transportation conditions, including vibration, humidity, and variable temperatures.
In commercial and residential energy storage and emergency power systems, including UPS units, emergency lighting, and portable power stations, it provides critical protection against overcharge, overload, and short‑circuit faults. The compact size saves space in battery cabinets and energy storage modules.
It is also widely used in precision electronic equipment, laboratory instruments, security systems, and mining DC power distribution equipment, where stable, reliable circuit protection is essential for operational safety. Whether for new installations or system upgrades, the FAZ‑C3‑1‑DC delivers professional, efficient, and economical protection for modern low‑power DC power systems.
FAQ
Q: What is the rated current of this breaker?
A: 3 A.
Q: Is this breaker designed for DC or AC systems?
A: It is specially designed for DC systems.
Q: How many poles does this model have?
A: 1 pole.
Q: What is the rated DC voltage per pole?
A: 250 V DC.
Q: What type of tripping curve does it use?
A: C‑curve.
Q: What is the short‑circuit breaking capacity?
A: Up to 10 kA (IEC 60947‑2).
Q: What mounting type is supported?
A: Standard 35 mm DIN‑rail mounting.
Q: What is the module width?
A: 17.7 mm (1 module).
Q: What is the operating temperature range?
A: ‑25 °C to +75 °C.
Q: What standards does it comply with?
A: IEC/EN 60947‑2, EN 45545‑2, IEC 61373, and RoHS.
Q: Can it be used in solar PV systems?
A: Yes, suitable for DC protection in small solar and energy storage systems.
Q: Does it support remote alarm accessories?
A: Yes, compatible with auxiliary contacts and alarm switches.
Q: Is this product RoHS compliant?
A: Yes.
Q: What types of loads can it protect?
A: Small DC motors, sensors, solar equipment, telecom devices, and low‑power industrial DC control circuits.
