1. Introduction
This instruction manual provides essential information for the safe and effective installation, operation, and maintenance of the SIEMENS US2:BF120A Ground Fault Circuit Interrupter (GFCI) Circuit Breaker. Please read this manual thoroughly before installation or use and retain it for future reference.
2. Important Safety Information
WARNING: Electrical shock hazard. Improper installation or use can result in serious injury or death. Always follow local and national electrical codes.
- Installation must be performed by a qualified electrician.
- Disconnect power at the main service panel before working on electrical circuits.
- Use appropriate personal protective equipment (PPE).
- Ensure all wiring connections are secure and meet specified torque requirements.
- Do not use this device if it appears damaged.
3. Product Overview and Features
The SIEMENS US2:BF120A is a 1-pole, 20 Amp, 120VAC Ground Fault Circuit Interrupter (GFCI) circuit breaker designed for panel board mounting. It provides critical circuit protection against ground faults, enhancing safety in electrical systems. This breaker is rated for 10kA Interrupting Rating at 120V~, 60Hz.
Key Features:
- Siemens Low Voltage Molded Case Circuit Breaker.
- Panel Board Mounting for 120V GFCI applications.
- 1-Pole, GFCI - BLF type.
- 10kAIC Interrupting Rating at 120VAC.
- Integrated Ground Fault protection (GFCI Class A, 5mA trip).
4. Technical Specifications
| Specification | Value |
|---|---|
| Brand | SIEMENS |
| Model Number | US2:BF120A |
| Current Rating | 20 Amps |
| Circuit Breaker Type | GFCI |
| Mounting Type | Panel Mount |
| Number Of Poles | 1 |
| Voltage | 120 Volts |
| Interrupting Rating | 10kAIC |
| Product Dimensions | 1 x 3 x 3.1 inches |
| Item Weight | 0.16 ounces |
| Wire Compatibility | CU #14-8 / AL #12-8 |
| Torque Specification | 25 lb-in |
| Operating Temperature | 40°C |
5. Installation Instructions
NOTICE: Installation of this circuit breaker should only be performed by a qualified electrician in accordance with all applicable electrical codes and standards.
General Steps:
- Power Disconnection: Turn off the main power supply to the electrical panel at the utility meter or main disconnect. Verify power is off using a voltage tester.
- Panel Access: Remove the cover of the electrical panel.
- Breaker Placement: Identify an available slot in the panel for the 1-pole breaker.
- Wiring Connections:
- Connect the load hot wire (black or colored) to the terminal marked 'LOAD' on the breaker.
- Connect the load neutral wire (white) to the terminal marked 'LOAD NEUTRAL' on the breaker.
- Connect the coiled white pigtail wire from the breaker to the panel's neutral bus bar.
- Ensure all connections are tightened to the specified torque of 25 lb-in.
- Mounting: Securely snap the circuit breaker onto the bus bar in the electrical panel.
- Panel Closure: Replace the electrical panel cover.
- Power Restoration: Restore power to the main service panel.
- Test Operation: Perform the GFCI test as described in the Operating Instructions section.
6. Operating Instructions
GFCI Test Procedure:
To ensure the GFCI circuit breaker is functioning correctly, it must be tested monthly.
- Ensure power is supplied to the circuit controlled by the GFCI breaker.
- Press the 'TEST' button located on the face of the circuit breaker.
- The breaker handle should immediately move to the 'TRIPPED' (center) position, and power to the circuit should be interrupted.
- To restore power, move the handle fully to the 'OFF' position, then to the 'ON' position.
- If the breaker does not trip when the 'TEST' button is pressed, or if it does not reset, the GFCI is not providing protection and must be replaced immediately.
7. Maintenance
The SIEMENS US2:BF120A GFCI Circuit Breaker requires minimal maintenance. Regular testing of the GFCI function (monthly) is the primary maintenance task. Periodically inspect the breaker for any signs of physical damage, discoloration, or loose connections. If any issues are observed, consult a qualified electrician.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Breaker trips frequently | Ground fault detected, Overload, Short circuit | Unplug appliances on the circuit to identify the faulty device. If the problem persists, consult an electrician to check for wiring issues or an overloaded circuit. |
| Breaker does not reset | Persistent ground fault, Internal damage to breaker | Ensure the handle is moved fully to 'OFF' before attempting to reset to 'ON'. If it still doesn't reset, there may be a continuous fault or the breaker is faulty and needs replacement. |
| GFCI Test button does not trip breaker | Faulty GFCI mechanism, No power to breaker | Verify power is supplied to the breaker. If power is present and the test button still fails, the GFCI breaker is defective and must be replaced. |
| No power to circuit | Breaker tripped, Loose wiring, Faulty breaker | Check if the breaker is in the 'TRIPPED' or 'OFF' position and reset it. Inspect wiring connections. If issues persist, consult an electrician. |
9. Warranty and Support
For information regarding product warranty, technical support, or service, please refer to the official SIEMENS website or contact SIEMENS customer service directly. Keep your purchase receipt as proof of purchase.