1. Produs terminatview
The ABB S203-B16 is a low voltage, 3-pole miniature circuit breaker designed for equipment protection. It features a 480Y/277 VAC voltage rating, a 16 A amperage rating, and an interrupt rating of 6 kA.
This device incorporates thermal/magnetic trip mechanisms for reliable overcurrent fault protection in various applications, including commercial appliances, control circuits, and computer equipment.

Figura 1: Față view of the ABB S203-B16 Miniature Circuit Breaker, showing the toggle switch and model markings.
2. Informații de siguranță
Always adhere to local electrical codes and regulations during installation and operation. Installation should only be performed by qualified personnel.
- Asigurați-vă că alimentarea este deconectată înainte de instalare sau întreținere.
- Nu acționați întrerupătorul de circuit dacă acesta pare deteriorat.
- Purtați echipament individual de protecție (EIP) adecvat.
- Refer to the wiring diagrams for correct connections.
3. Configurare și instalare
The S203-B16 circuit breaker is designed for DIN-rail mounting.
- Montare: Securely attach the circuit breaker to a standard DIN-rail. Ensure the mounting clip engages properly.
- Cablaj: Connect the electrical conductors to the screw terminals. The wire size supported is 18 - 4 AWG for conductors and 18 - 8 AWG for busbars.
- Strângerea terminalelor: Ensure all screw terminals are tightened to the specified torque to prevent loose connections and overheating.

Figura 2: Spate view illustrating the DIN-rail mounting mechanism.

Figura 3: Sus view showing the input terminals of the circuit breaker.

Figura 4: De jos view showing the output terminals of the circuit breaker.
4. Instrucțiuni de utilizare
The ABB S203-B16 circuit breaker is operated via a toggle actuator.
- Pentru a porni: Push the toggle actuator upwards to the "ON" position.
- A opri: Push the toggle actuator downwards to the "OFF" position.
- Indicație de declanșare: In case of an overcurrent or short circuit, the toggle actuator will automatically move to an intermediate "TRIPPED" position.
- Resetare după deplasare: To reset the circuit breaker after a trip, first move the toggle completely to the "OFF" position, then push it upwards to the "ON" position. Investigate the cause of the trip before resetting.
5. Întreținere
The ABB S203-B16 circuit breaker requires minimal maintenance. Regular inspections are recommended to ensure proper function and safety.
- Inspecție vizuală: Inspectați periodic întrerupătorul de circuit pentru a depista orice semne de deteriorare fizică, decolorare sau conexiuni slăbite.
- curatenie: If necessary, clean the exterior of the circuit breaker with a dry, lint-free cloth. Do not use abrasive cleaners or solvents.
- Verificare terminal: Verify that all terminal connections remain tight.
- Conditii de mediu: Ensure the operating environment remains within the specified temperature range (-25 to 55 deg C) and IP20 enclosure rating.
6. Depanare
| Problemă | Cauza posibila | Soluţie |
|---|---|---|
| Întrerupătorul de circuit se declanșează frecvent. | Suprasarcină, scurtcircuit sau aparat/cablaj defect. | Reduce load, check for short circuits, inspect connected equipment and wiring. |
| Întrerupătorul de circuit nu se resetează. | Persistent fault, internal damage. | Ensure the fault is cleared. If it still doesn't reset, the unit may be damaged and require replacement. Consult a qualified electrician. |
| Circuit breaker feels hot. | Suprasarcină, conexiuni slăbite sau defecțiune internă. | Reduce load, check terminal tightness, or replace the unit if overheating persists without apparent cause. |
If troubleshooting steps do not resolve the issue, contact a qualified electrician or ABB customer support.
7. Specificații
| Caracteristică | Detaliu |
|---|---|
| Model | S203-B16 |
| Tip | Vol. Scăzuttage Miniature Circuit Breaker |
| Număr de poli | 3 |
| Voltage Evaluare | 480Y/277 VAC |
| AmpEvaluare erage | 16 A |
| Evaluare de frecvență | 50/60 Hz |
| Evaluarea întreruperii | 6 kA |
| Tip de călătorie | Thermal/Magnetic |
| Raza de deplasare | 3 - 5 A Magnetic and 1.13 - 1.45 A Thermal |
| Tip actuator | Comutați |
| Dimensiunea firului | 18 - 4 AWG Conductor, 18 - 8 AWG Busbar |
| Tip terminal | Şurub |
| Tip carcasă | IP20 |
| Tip de montare | DIN-Rail |
| Temperatura nominală | -25 La 55 ° C |
| Dimensiuni | 88 mm Height x 52-1/2 mm Width x 69 mm Depth |
| Material | Plastic turnat |
| Standards/Approvals | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 |

Figura 5: lateral view displaying product specifications and international certifications.

Figura 6: lateral view showing the product barcode and manufacturing details.
8. Informații despre garanție
For detailed warranty information regarding your ABB S203-B16 Miniature Circuit Breaker, please refer to the official ABB warranty policy available on the manufacturer's website or contact ABB customer service directly. Keep your purchase receipt as proof of purchase.
9. Asistență pentru clienți
If you require technical assistance, have questions about installation, operation, or maintenance, please contact ABB customer support.
- Oficial ABB Website: www.abb.com
- Suport tehnic: Refer to the support section on the ABB website for contact numbers and online resources specific to your region.





