1. Introduction
This manual provides essential information for the safe and proper installation, operation, and maintenance of the Square D QOB120CP 20 Amp One-Pole Bolt-On Circuit Breaker. This device is designed to protect electrical systems from damage caused by overloads and short-circuits. Please read these instructions thoroughly before proceeding with any installation or operation.
2. Safety Information
WARNING: Risk of electric shock or electrocution. Installation and servicing of this circuit breaker must be performed by a qualified electrician in accordance with all national and local electrical codes. Failure to follow these instructions can result in serious injury or death.
- Always disconnect power at the main service panel before working on electrical circuits or equipment.
- Use appropriate personal protective equipment (PPE) when working with electricity.
- Ensure all wiring connections are secure and properly torqued.
- Do not use this device for purposes other than those specified in this manual.
- Consult the National Electrical Code (NEC) and local codes for specific requirements.
3. Product Overview
The Square D QOB120CP is a 20 Amp, single-pole, bolt-on circuit breaker manufactured by Schneider Electric. It is designed for use in Square D NQ or NQOD panelboards, requiring one space. This circuit breaker provides essential protection against electrical overloads and short-circuits, ensuring the safety and integrity of your electrical system.
Key Features:
- Overload and Short-Circuit Protection: Safeguards electrical circuits from excessive current and fault conditions.
- Visi-Trip Indicator: A highly visible red indicator that appears when the breaker trips, making it easy to identify the tripped circuit.
- Bolt-On Installation: Ensures a secure and reliable connection within compatible panelboards.
- ANSI Certified and UL Listed: Meets recognized safety and performance standards.
- Rated for 120/240 VAC, 10,000 AIR: Suitable for various residential and commercial applications.
Image 3.1: Technical Benefits. This image illustrates the key technical benefits of the Square D QOB120CP circuit breaker, including its miniature design, protection capabilities, UL certification, 10kA interrupting capacity, Visi-Trip indicator, and compatibility with QO electrical panels.
4. Setup and Installation
Installation of the QOB120CP circuit breaker requires knowledge of electrical systems and adherence to safety protocols. It is strongly recommended that installation be performed by a qualified electrician.
Installation Steps (for Qualified Electricians):
- Power Disconnection: Ensure all power to the electrical panel is turned off at the main service disconnect. Verify with a voltage tester.
- Panel Access: Carefully remove the cover of the electrical panel.
- Breaker Placement: Identify an available space in the Square D NQ or NQOD panelboard. The QOB120CP is a single-pole breaker and requires one space.
- Bolt-On Connection: Position the circuit breaker onto the bus bar and secure it using the bolt-on mechanism. Ensure a firm and proper connection.
- Wiring: Connect the circuit wire to the load terminal of the breaker. Ensure the wire gauge is appropriate for a 20 Amp circuit. Tighten the terminal screw to the manufacturer's specified torque.
- Panel Reassembly: Once all connections are secure and verified, replace the electrical panel cover.
- Power Restoration: Restore power to the main service panel.
Image 4.1: Side View of Circuit Breaker. This image shows a side view of the Square D QOB120CP circuit breaker, highlighting its compact design and the terminal for wire connection.
Image 4.2: Compatible Products. This image illustrates the compatibility of the QOB120CP circuit breaker with Square D NQ or NQOD panelboards, and shows related accessories like HLO1CP and QO1HPLCP.
5. Operation
The QOB120CP circuit breaker operates automatically to protect circuits from overcurrent conditions.
- ON Position: When the circuit breaker handle is in the "ON" position, power is supplied to the circuit.
- OFF Position: Moving the handle to the "OFF" position manually disconnects power to the circuit.
- Tripped Position (Visi-Trip): If an overload or short-circuit occurs, the circuit breaker will automatically trip. The handle will move to a midpoint position between "OFF" and "ON," and a highly visible red indicator will appear, making it easy to identify the tripped breaker.
Resetting a Tripped Breaker:
- Identify Cause: Before resetting, attempt to identify and correct the cause of the trip (e.g., unplug overloaded appliances).
- Full OFF: Firmly push the circuit breaker handle all the way to the "OFF" position. This resets the internal tripping mechanism.
- Turn ON: Push the handle firmly to the "ON" position. If the breaker immediately trips again, do not attempt to reset it further. Contact a qualified electrician.
6. Maintenance
The Square D QOB120CP circuit breaker is designed for reliable, long-term operation and requires minimal maintenance.
- Regular Inspection: Periodically inspect the circuit breaker and electrical panel for any signs of damage, discoloration, or loose connections. This should be done by a qualified electrician.
- Cleaning: Keep the area around the electrical panel and circuit breakers clean and free from dust and debris. Do not use liquids for cleaning inside the panel.
- No User Serviceable Parts: This device contains no user-serviceable parts. Do not attempt to disassemble or repair the circuit breaker.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Circuit breaker trips frequently. | Overloaded circuit, short-circuit, or faulty appliance. | Reduce load on the circuit. Unplug appliances. Inspect for damaged wiring. If problem persists, contact a qualified electrician. |
| Circuit breaker will not reset. | Persistent fault (short-circuit or severe overload) or internal breaker fault. | Ensure the handle is pushed fully to "OFF" before attempting to reset to "ON". If it still won't reset, do not force it. Contact a qualified electrician immediately. |
| No power to circuit, but breaker is "ON". | Loose connection, wiring fault, or internal breaker failure. | Contact a qualified electrician for inspection and repair. |
8. Specifications
| Feature | Detail |
|---|---|
| Brand | Schneider Electric |
| Model | QOB120CP |
| Current Rating | 20 Amps |
| Number of Poles | 1 |
| Voltage Rating | 120/240 Volts AC |
| Interrupting Rating (AIR) | 10,000 Amps |
| Circuit Breaker Type | Standard Thermal-Magnetic |
| Mounting Type | Bolt-On Mount |
| Product Dimensions (D x W x H) | 2.9" x 0.75" x 3" |
| Weight | 0.01 Ounces (approx.) |
| Certifications | ANSI Certified, UL Listed |
Image 8.1: Product Dimensions. This image provides a visual representation of the physical dimensions of the Square D QOB120CP circuit breaker, showing its depth, width, and height.
9. Warranty and Support
Warranty Information:
The Square D QOB120CP Circuit Breaker comes with a Limited Lifetime Warranty from Schneider Electric. This warranty covers defects in materials and workmanship under normal use. For specific terms, conditions, and limitations of the warranty, please refer to the official warranty documentation provided with your product or visit the Schneider Electric website.
Customer Support:
For technical assistance, warranty claims, or further information regarding the Square D QOB120CP circuit breaker, please contact Schneider Electric customer support.
- Online Resources: Visit the official Schneider Electric website for product documentation, FAQs, and support contacts.
- Professional Assistance: For any electrical issues or concerns, always consult a qualified and licensed electrician.