1. Produto rematadoview
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: Fronte view of the ABB S203-B16 Miniature Circuit Breaker, showing the toggle switch and model markings.
2. Información de seguridade
Always adhere to local electrical codes and regulations during installation and operation. Installation should only be performed by qualified personnel.
- Asegúrese de desconectar a alimentación antes da instalación ou mantemento.
- Non accione o disxuntor se parece estar danado.
- Use equipos de protección individual (EPI) adecuados.
- Refer to the wiring diagrams for correct connections.
3. Configuración e instalación
The S203-B16 circuit breaker is designed for DIN-rail mounting.
- Montaxe: Securely attach the circuit breaker to a standard DIN-rail. Ensure the mounting clip engages properly.
- Cableado: Connect the electrical conductors to the screw terminals. The wire size supported is 18 - 4 AWG for conductors and 18 - 8 AWG for busbars.
- Aperte de terminais: Asegúrese de que todos os terminais de parafuso estean axustados ao par especificado para evitar conexións soltas e sobrequecemento.

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

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

Figura 4: Abaixo view showing the output terminals of the circuit breaker.
4. Instrucións de funcionamento
The ABB S203-B16 circuit breaker is operated via a toggle actuator.
- Para ACTIVAR: Push the toggle actuator upwards to the "ON" position.
- Para apagar: Push the toggle actuator downwards to the "OFF" position.
- Trip Indication: In case of an overcurrent or short circuit, the toggle actuator will automatically move to an intermediate "TRIPPED" position.
- Resetting After Trip: 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. Mantemento
The ABB S203-B16 circuit breaker requires minimal maintenance. Regular inspections are recommended to ensure proper function and safety.
- Inspección visual: Inspeccione periodicamente o disxuntor para detectar calquera signo de danos físicos, decoloración ou conexións soltas.
- Limpeza: If necessary, clean the exterior of the circuit breaker with a dry, lint-free cloth. Do not use abrasive cleaners or solvents.
- Comprobación do terminal: Verify that all terminal connections remain tight.
- Condicións ambientais: Ensure the operating environment remains within the specified temperature range (-25 to 55 deg C) and IP20 enclosure rating.
6 Solución de problemas
| Problema | Causa posible | Solución |
|---|---|---|
| O disyuntor salta con frecuencia. | Overload, short circuit, or faulty appliance/wiring. | Reduce load, check for short circuits, inspect connected equipment and wiring. |
| O disxuntor non se reinicia. | 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. |
| O disxuntor ten unha sensación de quecemento. | Sobrecarga, conexións soltas ou fallo interno. | 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. Especificacións
| Característica | Detalle |
|---|---|
| Modelo | S203-B16 |
| Tipo | Baixo Voltage Miniature Circuit Breaker |
| Número de polos | 3 |
| Voltage Avaliación | 480Y/277 VAC |
| AmpClasificación de era | 16 A |
| Clasificación de frecuencia | 50/60 Hz |
| Valoración de interrupción | 6 kA |
| Tipo de viaxe | Thermal/Magnetic |
| Rango de viaxe | 3 - 5 A Magnetic and 1.13 - 1.45 A Thermal |
| Tipo de actuador | Alterna |
| Tamaño do fío | 18 - 4 AWG Conductor, 18 - 8 AWG Busbar |
| Tipo de terminal | Parafuso |
| Tipo de recinto | IP20 |
| Tipo de montaxe | Carril DIN |
| Valoración de temperatura | -25 a 55 graos C |
| Dimensións | 88 mm Height x 52-1/2 mm Width x 69 mm Depth |
| Material | Plástico moldeado |
| 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. Información da garantía
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. Atención ao cliente
If you require technical assistance, have questions about installation, operation, or maintenance, please contact ABB customer support.
- ABB Official Websitio: www.abb.com
- Soporte técnico: Refer to the support section on the ABB website for contact numbers and online resources specific to your region.





