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ABB S203-B25 (2CDS253001R0255) Compact S200 Miniature Circuit Breaker   

1. Key Parameters

• Product Model: S203-B25
• Order Code: 2CDS253001R0255
• Product Series: ABB S200 Series Compact Miniature Circuit Breakers (Low-Voltage Overcurrent Protection, 3-Phase Applications)
• Core Function: Protects 3-phase low-voltage circuits from overcurrent and short-circuit faults; ensures selective tripping to isolate faulty circuits; safeguards connected equipment and wiring; complies with global electrical safety standards
• Electrical & Protection Specifications:

  Parameter	Details	Performance Metrics
  Circuit Configuration	- Pole Count: 3 poles (3-phase protection) - Rated Voltage (Ue): 400V AC (50/60Hz); 250V DC (optional) - Rated Insulation Voltage (Ui): 690V AC - Rated Impulse Withstand Voltage (Uimp): 6kV	Compatible with standard 3-phase industrial power systems (e.g., 380V AC/400V AC grids), ensuring broad applicability
  Current Ratings	- Rated Current (In): 25A (continuous safe current) - Overload Tripping Range: 1.05×In (no trip) to 1.3×In (trip within 1 hour) - Short-Circuit Tripping Current (Icu): 10kA (at 400V AC) - Short-Circuit Making Capacity (Icm): 25kA (at 400V AC)	Interrupts faults up to 10kA—handles short-circuits common in industrial environments (e.g., motor startup surges, wiring faults)
  Tripping Characteristic	- Type: B curve (trips at 3×In~5×In) - Overload Tripping Time: ≤1h at 1.3×In; ≤1s at 6×In - Short-Circuit Tripping Time: ≤0.01s at 10×In - Selectivity: Compatible with upstream ABB Tmax molded case circuit breakers (MCCBs)	B curve optimized for protection of lighting circuits, control systems, and low-inrush equipment (e.g., ABB I/O modules, small actuators)
  Safety & Compliance	- Breaking Capacity (Icn): 10kA (at 400V AC) - Protection Class: IP20 (finger protection) - Safety Certifications: IEC 60898-1, EN 60898-1, UL 489, CSA C22.2 No. 5 - Terminal Torque: 2.5Nm (copper conductors)	Meets global safety standards for low-voltage circuit protection, ensuring compliance in multi-region projects

• Mechanical Specifications:
  • Dimensions: 18mm (width per pole) × 89mm (height) × 65mm (depth) (3-pole total width: 54mm)
  • Mounting Type: DIN rail mount (EN 50022, 35mm top-hat rail); panel mount optional (via adapter)
  • Housing Material: Thermoplastic (UL 94 V0, flame-retardant)
  • Weight: Approximately 120g (3-pole unit)
  • Operating Mechanism: Toggle switch (ON/OFF position indicator); manual reset after tripping
• Environmental Ratings:
  • Operating Temperature Range: -25℃~+60℃ (-13℉~140℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: 5%~95% RH (non-condensing, 40℃)
  • Altitude Rating: Up to 2000m (derated by 1% per 100m above 1000m)
  • Vibration Resistance: 10~500Hz, 1g acceleration (IEC 60068-2-6; no unintended tripping)
  • Shock Resistance: 20g (11ms half-sine, IEC 60068-2-27; no mechanical damage)

2. Key Features

• 3-Phase Protection with Compact Design: 3-pole configuration in a 54mm-wide DIN rail footprint—saves 30% space in distribution boards compared to bulkier circuit breakers, enabling dense installation alongside ABB automation components (e.g., S800 I/O racks, 57520001-ER/1 power supplies).
• 10kA High Breaking Capacity: Interrupts short-circuit currents up to 10kA at 400V AC—handles severe faults in industrial systems (e.g., motor winding shorts, wiring insulation failures) without damage to the breaker itself.
• B-Curve Tripping Characteristic: Trips at 3×In~5×In, making it ideal for low-inrush loads—protects ABB control modules (e.g., AI893, CI801), lighting circuits, and small actuators without nuisance tripping from normal startup currents.
• Global Safety Certification: Complies with IEC 60898-1, UL 489, and CSA C22.2 No. 5—ensures seamless integration in multi-region projects (e.g., European factories, North American data centers) without regional modifications.
• IP20 Finger Protection: Prevents accidental contact with live terminals—reduces electrical shock risks during maintenance of control cabinets, meeting safety requirements for industrial workplaces (OSHA, EU Machinery Directive).
• Wide Environmental Tolerance: -25℃~+60℃ operating range and 1g vibration resistance—operates reliably in extreme conditions: cold storage facilities, high-temperature industrial zones (e.g., refineries), and mobile equipment (e.g., construction machinery).
• Selective Tripping Compatibility: Works with upstream ABB Tmax MCCBs to ensure selective tripping—isolates only the faulty circuit (e.g., a shorted sensor) instead of shutting down the entire power distribution system, minimizing downtime.

3. Application Fields

• ABB Automation System Power Protection: Primary application—safeguarding ABB control circuits:
  • Industrial Control Cabinets: Protects 3-phase power supplies for S800 I/O racks (AI893, DI825) and 800xA DCS components; B-curve tripping avoids nuisance shutdowns from I/O module inrush currents, while 10kA breaking capacity handles short-circuits from damaged wiring.
  • AC800M PLC Power Distribution: Supplies protected 3-phase power to CI801 fieldbus interfaces and TU805K01 termination units; compact design fits in DIN rail-mounted control panels, saving space for other automation components.
• Commercial & Industrial Electrical Distribution: Protecting low-voltage circuits:
  • Manufacturing Plant Lighting & Controls: Powers and protects 3-phase lighting circuits and small motor controls (e.g., conveyor fans); B-curve characteristic accommodates lighting inrush currents without tripping, ensuring consistent factory illumination.
  • Data Center Auxiliary Systems: Protects 3-phase power to HVAC controls and server room lighting; wide temperature range (-25℃~+60℃) handles data center cooling zones, while IP20 protection reduces shock risks during maintenance.
• Residential & Commercial Building Electrical Systems: Safeguarding building circuits:
  • Apartment Complex 3-Phase Distribution: Protects 3-phase power to communal systems (e.g., elevators, central AC); selective tripping ensures a single faulty circuit (e.g., elevator motor) doesn’t disrupt power to all units.
  • Retail Store Electrical Panels: Protects 3-phase power to refrigeration units and lighting systems; flame-retardant housing (UL 94 V0) reduces fire risk in crowded retail spaces, complying with building codes (NFPA 70, IEC 60364).
• Mobile & Specialized Applications: Protection for portable equipment:
  • Construction Site Temporary Power: Installed in portable distribution boards to protect 3-phase tools (e.g., concrete mixers, welders); rugged design withstands vibration from construction machinery, while wide temperature range handles outdoor conditions.
  • Food Processing Mobile Units: Protects 3-phase power to temporary refrigeration and processing equipment; non-condensing humidity tolerance prevents corrosion in washdown environments, ensuring reliable operation during food production.

4. Precautions

• Current Rating & Load Matching (Critical): Ensure the 25A rated current (In) matches the maximum continuous current of the protected circuit—oversizing (e.g., using S203-B25 for a 30A load) prevents proper overload protection, while undersizing (e.g., for a 30A load) causes nuisance tripping. Calculate total load current (sum of connected devices) before installation.
• Installation & Wiring Safety:
  • Polarity & Phase Alignment: For 3-phase circuits, connect phases L1, L2, L3 to the corresponding breaker poles—incorrect phase alignment disrupts 3-phase equipment (e.g., motors) and may cause overheating; verify phase continuity with a multimeter.
  • Terminal Torque: Tighten terminal screws to 2.5Nm (for copper conductors)—under-tightening causes high resistance (overheating), while over-tightening strips threads or damages conductors; use a torque screwdriver for accuracy.
  • Wire Gauge Compatibility: Use copper conductors of 1.5mm²~6mm² (24~10 AWG) — undersized wires overheat even if the breaker trips, while oversized wires don’t seat properly in terminals; refer to ABB’s wiring guide for gauge recommendations.
• Operation & Maintenance:
  • Tripping Investigation: After a trip, identify and resolve the root cause (e.g., short circuit, overload) before resetting—resetting without fixing the fault may damage equipment or cause fires; use a clamp meter to measure current and check for faults.
  • 定期 Testing: Test the breaker monthly by toggling the ON/OFF switch—ensure smooth operation and proper engagement; annually, perform an overload test (using a test kit) to verify tripping functionality, as mechanical wear may reduce performance over time.
  • Environmental Limits: Do not operate above +60℃ or in condensing humidity (>95% RH, 40℃)—high temperatures degrade the tripping mechanism, while condensation causes internal corrosion; use cabinet heaters/dehumidifiers in extreme environments.
• Replacement & Spare Parts:
  • Genuine ABB Components: Use only genuine ABB S203-B25 (2CDS253001R0255) breakers—non-genuine alternatives lack ABB’s 10kA breaking capacity and safety certifications, leading to breaker failure during faults and potential equipment damage.
  • Spare Inventory: Maintain 2~3 spare breakers per 10 protected circuits—MCBs are critical for restoring power after faults; spares reduce downtime from days (delivery lead time) to minutes, especially in mission-critical systems (e.g., ABB automation control cabinets)

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