1. Product Overview
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.
Figure 1: Front view of the ABB S203-B16 Miniature Circuit Breaker, showing the toggle switch and model markings.
2. Safety Information
Always adhere to local electrical codes and regulations during installation and operation. Installation should only be performed by qualified personnel.
- Ensure power is disconnected before installation or maintenance.
- Do not operate the circuit breaker if it appears damaged.
- Wear appropriate personal protective equipment (PPE).
- Refer to the wiring diagrams for correct connections.
3. Setup and Installation
The S203-B16 circuit breaker is designed for DIN-rail mounting.
- Mounting: Securely attach the circuit breaker to a standard DIN-rail. Ensure the mounting clip engages properly.
- Wiring: Connect the electrical conductors to the screw terminals. The wire size supported is 18 - 4 AWG for conductors and 18 - 8 AWG for busbars.
- Terminal Tightening: Ensure all screw terminals are tightened to the specified torque to prevent loose connections and overheating.
Figure 2: Rear view illustrating the DIN-rail mounting mechanism.
Figure 3: Top view showing the input terminals of the circuit breaker.
Figure 4: Bottom view showing the output terminals of the circuit breaker.
4. Operating Instructions
The ABB S203-B16 circuit breaker is operated via a toggle actuator.
- To Turn ON: Push the toggle actuator upwards to the "ON" position.
- To Turn OFF: 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. Maintenance
The ABB S203-B16 circuit breaker requires minimal maintenance. Regular inspections are recommended to ensure proper function and safety.
- Visual Inspection: Periodically inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections.
- Cleaning: If necessary, clean the exterior of the circuit breaker with a dry, lint-free cloth. Do not use abrasive cleaners or solvents.
- Terminal Check: Verify that all terminal connections remain tight.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature range (-25 to 55 deg C) and IP20 enclosure rating.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Circuit breaker trips frequently. | Overload, short circuit, or faulty appliance/wiring. | Reduce load, check for short circuits, inspect connected equipment and wiring. |
| Circuit breaker does not reset. | 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. | Overload, loose connections, or internal fault. | 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. Specifications
| Feature | Detail |
|---|---|
| Model | S203-B16 |
| Type | Low Voltage Miniature Circuit Breaker |
| Number of Poles | 3 |
| Voltage Rating | 480Y/277 VAC |
| Amperage Rating | 16 A |
| Frequency Rating | 50/60 Hz |
| Interrupt Rating | 6 kA |
| Trip Type | Thermal/Magnetic |
| Trip Range | 3 - 5 A Magnetic and 1.13 - 1.45 A Thermal |
| Actuator Type | Toggle |
| Wire Size | 18 - 4 AWG Conductor, 18 - 8 AWG Busbar |
| Terminal Type | Screw |
| Enclosure Type | IP20 |
| Mounting Type | DIN-Rail |
| Temperature Rating | -25 to 55 deg C |
| Dimensions | 88 mm Height x 52-1/2 mm Width x 69 mm Depth |
| Material | Molded Plastic |
| Standards/Approvals | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 |
Figure 5: Side view displaying product specifications and international certifications.
Figure 6: Side view showing the product barcode and manufacturing details.
8. Warranty Information
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. Customer Support
If you require technical assistance, have questions about installation, operation, or maintenance, please contact ABB customer support.
- ABB Official Website: www.abb.com
- Technical Support: Refer to the support section on the ABB website for contact numbers and online resources specific to your region.
