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ABB S2C-H11L (2CDS200936R0001) Miniature Circuit Breaker 

1. Key Parameters

• Product Model: S2C-H11L
• Order Code: 2CDS200936R0001
• Product Series: ABB S2C Miniature Circuit Breakers (AC/DC Dual-Rated, H-curve, 1A~63A Current Ratings)
• Core Function: Provides overcurrent protection (overload + short circuit) for 1-phase AC (230V) and DC (250V) circuits; enables manual AC/DC circuit switching; suppresses DC arcs (critical for DC safety); protects renewable energy systems (solar PV, BESS) and industrial DC loads
• Electrical Specifications:

  Parameter	Details	Performance Metrics
  Circuit Compatibility	- Current Rating (Iₙ): 11A (AC/DC) - Voltage Rating: 230V AC (50/60Hz); 250V DC (polarized, +/–) - Breaking Capacity (Iₙₚ): 10kA (AC, 230V); 5kA (DC, 250V) - Polarity: DC polarized (requires correct +/– wiring for arc quenching)	Suitable for 230V AC small loads (e.g., 2.5kW appliances) and 250V DC systems (e.g., 2.75kW solar PV strings, 12V/24V battery banks)
  Protection Characteristics	- Tripping Curve: H-curve (IEC 60898-1) - AC Overload Tripping: 1.45×Iₙ (no trip); 2.5×Iₙ (trip ≤1h); 10×Iₙ (trip ≤0.1s, short circuit) - DC Overload Tripping: 1.5×Iₙ (no trip); 2.6×Iₙ (trip ≤1h); 10×Iₙ (trip ≤0.15s, short circuit) - DC Arc Quenching: Built-in magnetic arc blowout (suppresses persistent DC arcs)	H-curve matches high-inrush DC loads (e.g., solar inverter startup, battery charging); DC arc suppression prevents arc flash hazards (common in DC circuits)
  Electrical Endurance	- ON/OFF Cycles: 10,000 mechanical cycles; 1,000 electrical cycles (AC/DC, rated current) - Contact Resistance: ≤10mΩ (AC/DC, rated current)	Ensures 8+ years of reliable operation in solar PV systems (typically 1~2 switch cycles per year for maintenance)
  Insulation Performance	- Insulation Resistance: ≥100MΩ (500V DC, between live parts and ground) - Dielectric Strength: 2.5kVrms (1min, AC); 3kV DC (1min, between live parts and ground)	Withstands voltage surges (e.g., solar PV string overvoltage, DC battery spikes) without insulation breakdown

• Mechanical Specifications:
  • Housing Material: Flame-retardant thermoplastic (UL94 V-0); DC-specific arc-resistant design (contains magnetic arc blowout components)
  • Dimensions (W×H×D): 18mm × 85mm × 68mm (DIN rail-mountable; slim width for dense DC distribution boards)
  • Mounting: 35mm standard DIN rail (TS 35/7.5); Snap-on installation (no tools required); Compatible with ABB S2C accessories (e.g., DC shunt trips, auxiliary contacts for remote status)
  • Weight: Approximately 55g
  • Terminals: 2× high-current screw terminals (input/output); Accepts wire sizes: 1.5mm²~6mm² (solid/stranded copper wire, tinned for DC corrosion resistance)
  • Operating Mechanism: Toggle lever (ON/OFF/TRIP); Visual trip indicator (lever moves to mid-position when tripped); DC polarity marking (+/–) for correct wiring
• Environmental Ratings:
  • Operating Temperature Range: -25℃~+60℃ (-13℉~140℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: ≤95% RH (non-condensing, 40℃; suitable for outdoor solar PV combiner boxes with IP65 protection)
  • Vibration Resistance: 10~500Hz, 1g acceleration (IEC 60068-2-6; No unintended tripping in solar rack-mounted systems)
  • UV Resistance: EN ISO 105-B02 (UV exposure for 1000h; Suitable for outdoor DC distribution boards with UV shielding)
• Compliance Standards: IEC 60898-1 (AC/DC MCBs), EN 60898-1, UL 489 (North American safety), CE, RoHS, IEC 61730-1 (solar PV system safety), UL 1077 (supplementary protection for DC circuits)

2. Key Features

• AC/DC Dual-Rated Protection: Works with 230V AC and 250V DC circuits—eliminates the need for separate AC and DC breakers in hybrid systems (e.g., solar PV + AC loads, battery storage + AC backup), reducing distribution board size by 50% and simplifying wiring.
• DC Arc Suppression with Magnetic Blowout: Built-in magnetic arc blowout technology rapidly extinguishes persistent DC arcs (a major DC safety hazard)—prevents arc flash and fire risks in DC circuits (e.g., solar PV string short circuits), where AC-style arc quenching is ineffective.
• H-Curve Tripping for High-Inrush DC Loads: H-curve tripping characteristics (10×Iₙ short-circuit trip) tolerate high inrush currents from DC loads (e.g., solar inverter startup ~15A, battery charger inrush ~20A) without false trips—critical for renewable energy systems with variable current demands.
• Polarized DC Wiring & Marking: Clear +/– polarity markings on terminals ensure correct DC wiring—incorrect polarity disables arc suppression, so the MCB includes a mechanical interlock (optional) to prevent reverse wiring, enhancing safety in DC systems (e.g., battery banks).
• Slim 18mm Width & DIN Rail Compatibility: Compact design fits densely packed DC distribution boards (e.g., solar combiner boxes, BESS control panels)—enables installation of multiple breakers for parallel PV strings or battery modules, optimizing space in outdoor enclosures.
• Solar PV Safety Compliance: Meets IEC 61730-1 (solar PV system safety) and UL 1077 (DC supplementary protection)—certified for use in grid-tied and off-grid solar systems, ensuring compliance with global renewable energy codes (e.g., NEC 690 in North America, VDE 0126 in Europe).
• Flame-Retardant & UV-Resistant Housing: UL94 V-0 thermoplastic resists ignition and flame spread, while UV resistance (EN ISO 105-B02) withstands outdoor exposure (when installed in IP65 enclosures)—suitable for solar PV combiner boxes mounted on rooftops or ground-mounted arrays.

3. Application Fields

• Solar PV Systems: Primary application—protection for PV strings and inverters:
  • PV String Protection: Protects 250V DC PV strings (e.g., 10×25V PV modules in series) with 11A rated current; H-curve tripping tolerates inverter startup inrush (~15A) without false trips, while DC arc suppression prevents arc flash from broken PV wires.
  • PV Combiner Boxes: Installed in 1P DC combiner boxes to protect individual PV strings (parallel configuration); Slim 18mm width enables 10+ breakers in a single combiner box, reducing wiring complexity and enclosure size.
• Battery Energy Storage (BESS): Protection for battery banks and charge/discharge circuits:
  • Low-Voltage Battery Banks: Protects 12V/24V/48V battery banks (e.g., 48V 50Ah lithium-ion batteries) in off-grid systems; Polarized wiring ensures correct +/– connection, while overload protection prevents battery damage from excessive discharge current (e.g., 15A from a faulty inverter).
  • Battery Charge Circuits: Controls 250V DC charge current (≤11A) from solar charge controllers to battery banks; Arc suppression prevents hazards from accidental terminal shorting during battery maintenance.
• Industrial DC Power Supplies: Protection for low-voltage DC loads:
  • DC Control Circuits: Protects 250V DC control circuits in manufacturing plants (e.g., PLC DC power supplies, motorized valve actuators); AC/DC dual rating allows the same breaker to protect 230V AC power inputs and 250V DC control outputs, simplifying inventory.
  • DC Lighting Systems: Safeguards 24V DC LED lighting circuits in industrial facilities or outdoor areas; Vibration resistance (1g) prevents unintended tripping in factory environments, while UV resistance suits outdoor lighting control boxes.
• Residential Backup Systems: Protection for hybrid AC/DC backup loads:
  • Home Solar Backup: Controls 250V DC current from rooftop PV to a home battery (e.g., Tesla Powerwall-compatible systems) and 230V AC current to critical loads (e.g., refrigerators, lights); Dual AC/DC rating eliminates the need for separate breakers, reducing home electrical panel clutter.
  • RV/Marine DC Systems: Protects 12V DC circuits in RVs (e.g., water pumps, lighting) or boats (e.g., navigation equipment); Compact design fits small RV/marine electrical panels, while humidity tolerance (≤95% RH) withstands damp environments.

4. Precautions

• AC/DC Polarity & Voltage Limits (Critical):
  • DC Wiring: Strictly follow +/– polarity markings—reverse DC wiring disables arc suppression, leading to persistent arcs (fire hazard) during short circuits. Use a multimeter to confirm DC polarity before wiring.
  • Voltage Ratings: Do not exceed 230V AC or 250V DC—overvoltage (e.g., 300V DC from a faulty PV string) causes insulation breakdown and MCB failure. Verify system voltage against the breaker’s ratings.
• Installation & Wiring:
  • Power Disconnection: For DC systems, discharge capacitors/batteries before wiring—250V DC retains charge after power-off, posing shock risks. Use insulated tools and lockout/tagout; For AC systems, turn off the main supply and verify with a voltage tester.
  • Terminal Torque & Wire Gauge: Tighten terminals to 1.5 N·m (1.5mm²~6mm² wire); Under-tightening causes high contact resistance (overheated terminals, especially in DC circuits), while over-tightening damages threads. Use tinned copper wire for DC applications to prevent corrosion.
  • Outdoor Installation: Install in IP65+ enclosures when used outdoors (e.g., solar combiner boxes)—exposure to rain/dust causes terminal corrosion (DC circuits are more prone to corrosion than AC) and reduces insulation performance.
• Operation & Maintenance:
  • DC Arc Testing: Periodically test DC arc suppression by intentionally tripping the breaker (with a low-current short circuit, performed by a qualified electrician)—ensures the magnetic blowout works correctly; Faulty arc suppression requires immediate MCB replacement.
  • Trip Reset Procedure: After tripping, first isolate the fault (e.g., disconnect a faulty PV module, repair shorted DC wires) before resetting—Resetting without fault correction causes repeated tripping and accelerates arc component wear. Do not force the lever if it trips immediately.
• Environmental Limitations:
  • Temperature & Humidity: Do not operate above +60℃ or in condensing humidity—High temperatures (>60℃) degrade DC arc suppression components (reducing arc quenching efficiency), while condensation causes terminal corrosion (intermittent connections in DC circuits). Use heat sinks or fans for high-temperature environments (e.g., desert solar arrays).
  • UV Exposure: Even with UV-resistant housing, avoid direct sunlight—Long-term direct UV exposure (≥5000h) weakens the thermoplastic, increasing arc escape risk. Use opaque enclosures for outdoor combiner boxes.
• Replacement & Compatibility:
  • Genuine ABB Replacements: Replace with identical ABB S2C-H11L breakers—Non-genuine DC breakers may lack arc suppression or have incorrect H-curve tripping (e.g., B-curve), leading to inadequate protection (e.g., false trips or failure to trip during short circuits).
  • Accessory Compatibility: Use only ABB S2C-approved accessories (e.g., DC shunt trips)—Non-compatible accessories (e.g., AC-only shunts) disrupt DC arc suppression and void safety certifications
• 
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