1. Product Overview
The Siemens QJ22B070 is a 70-Amp Double Pole 240-Volt 10KIAC circuit breaker designed for the protection of branch and feeder circuits. It is suitable for industrial and commercial applications, including use as mains in load centers, lighting panel boards, and metering centers. Its compact size and high continuous ampere ratings also make it ideal for installation in distribution panel boards, control panels, motor control centers, and individual enclosures.
Figure 1: Siemens QJ22B070 circuit breaker, a compact electrical protection device.
2. Important Safety Information
WARNING: Risk of electric shock, fire, or explosion. Installation and servicing of this circuit breaker must be performed by qualified electrical personnel only. 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), including insulated gloves and eye protection.
- Verify that the circuit breaker rating matches the requirements of the electrical system.
- Ensure all connections are tight and secure to prevent overheating.
- Do not use damaged or modified circuit breakers.
- Adhere to all local and national electrical codes.
3. Product Features
The Siemens QJ22B070 circuit breaker offers the following key features:
- UL Listed for safety and compliance.
- 10,000 Ampere Interrupting Rating (IR) for robust fault protection.
- Type QJ2 design for specific panel compatibility.
- Compact dimensions: 7.0" x 3.0" x 3.0" for space-efficient installation.
- Double Pole configuration for 240-Volt applications.
- Plug-In Mount for ease of installation in compatible panels.
4. Setup and Installation
Note: Installation should only be performed by a qualified electrician in accordance with all applicable electrical codes.
- Power Disconnection: Before beginning any work, ensure that all power to the electrical panel is completely disconnected at the main service disconnect. Verify with a voltage tester.
- Panel Access: Open the electrical panel cover to access the bus bar and existing wiring.
- Breaker Placement: Identify an available slot on the panel's bus bar that is compatible with a plug-in type QJ2 breaker.
- Installation: Align the circuit breaker with the bus bar stabs and firmly push it into place until it is securely seated. Ensure both poles make proper contact.
- Wiring Connections: Connect the load wires to the appropriate terminals on the circuit breaker. For a double pole breaker, connect the two hot load wires to the two terminals. Ensure connections are tight using a screwdriver of the correct size. Refer to the wiring diagram of your specific panel for correct load wire connections.
- Panel Closure: Once all connections are secure and verified, replace the electrical panel cover.
- Power Restoration: Restore power to the main service panel.
5. Operating Instructions
The Siemens QJ22B070 circuit breaker operates as a protective device for your electrical circuits. Its primary functions are to switch power on/off and to automatically interrupt power in case of an overload or short circuit.
- Turning ON: To energize the circuit, push the breaker handle firmly to the "ON" position.
- Turning OFF: To de-energize the circuit, push the breaker handle firmly to the "OFF" position.
- Tripped Condition: If an overload or short circuit occurs, the breaker will automatically "trip." The handle will move to an intermediate position, typically between "ON" and "OFF," or fully to the "OFF" position depending on the specific trip mechanism.
- Resetting a Tripped Breaker: To reset a tripped breaker, first move the handle completely to the "OFF" position. Then, push the handle firmly to the "ON" position. If the breaker immediately trips again, do not attempt to reset it repeatedly. This indicates a persistent fault that requires investigation.
6. Maintenance
Circuit breakers generally require minimal maintenance. Regular visual inspections are recommended to ensure proper function and safety.
- Annual Visual Inspection: Periodically inspect the circuit breaker for any signs of physical damage, discoloration, or loose connections. Discoloration may indicate overheating.
- Dust and Debris: Ensure the area around the breaker is free from dust and debris, which can impede heat dissipation.
- Professional Inspection: For any concerns or if the breaker frequently trips without an apparent cause, consult a qualified electrician for a thorough inspection and testing.
- Cleaning: If cleaning is necessary, ensure power is disconnected and use a dry, lint-free cloth. Do not use liquids or abrasive cleaners.
7. Troubleshooting
If you encounter issues with your Siemens QJ22B070 circuit breaker, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Breaker trips frequently | Overloaded circuit, short circuit, ground fault, or faulty appliance. |
|
| Breaker will not reset | Persistent overload or short circuit, or internal breaker fault. |
|
| Breaker feels hot | Overload, loose connection, or internal fault. |
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Important: Do not attempt to repair electrical components unless you are a qualified professional. Always prioritize safety.
8. Specifications
Key technical specifications for the Siemens QJ22B070 circuit breaker:
| Attribute | Value |
|---|---|
| Brand | SIEMENS |
| Model Number | QJ22B070 |
| Current Rating | 70 Amps |
| Voltage Rating | 240 Volts |
| Number of Poles | 2 (Double Pole) |
| Interrupting Rating (IR) | 10,000 Amperes (10KIAC) |
| Circuit Breaker Type | Standard, Type QJ2 |
| Mounting Type | Plug-In Mount |
| Product Dimensions (L x W x H) | 7.0" x 3.0" x 3.0" |
| UL Listed | Yes |
| UPC | 783643200982 |
| GTIN | 00783643200982 |
9. Warranty and Support
Warranty Information: Siemens strongly recommends against the use of "used" breakers. The installation of used breakers in a Siemens panel will void the warranty on the panel. Siemens does not sell used breakers and has not approved any 3rd party sellers to do so.
For technical support or further inquiries, please refer to the official Siemens website or contact their customer service department. Always provide your product model number (QJ22B070) when seeking support.
For more information, visit the official Siemens Store.
