Siemens BQD345 45-Amp Three Pole Circuit Breaker

1. Introduction

This manual provides essential information for the safe and effective installation, operation, and maintenance of the Siemens BQD345 45-Amp Three Pole Circuit Breaker. Please read this manual thoroughly before attempting any installation or operation. Retain this manual for future reference.

2. Safety Information

WARNING: Electrical shock hazard. Installation and servicing of this equipment must be performed by qualified personnel only. Always disconnect power at the main service panel before working with circuit breakers or electrical panels.

• Ensure all local and national electrical codes are followed during installation.
• Do not install damaged equipment. Inspect the circuit breaker for any signs of damage before installation.
• Never attempt to bypass or modify the circuit breaker's protective functions.
• 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.

3. Product Overview

The Siemens BQD345 is a 45-Amp, three-pole, bolt-in type circuit breaker designed for panel board mounting. It is rated for 480Y/277V AC with a 14KAIC interrupting rating. This thermal-magnetic circuit breaker provides overcurrent protection for electrical circuits.

Key Features:

• Type BQD
• Three Pole Configuration
• 45 Amps Current Rating
• 480Y/277V AC Voltage Rating
• 14KAIC Interrupting Rating
• Panel Board Mounting (Bolt-in)
• UL Listed

Product Images:

4. Setup and Installation

The Siemens BQD345 circuit breaker is designed for bolt-in installation within a compatible panel board. Installation must be performed by a qualified electrician in accordance with all applicable electrical codes.

1. Power Disconnection: Before beginning any work, ensure that all power to the electrical panel is completely disconnected at the main service entrance. Verify with a voltage tester.
2. Panel Access: Carefully remove the cover of the electrical panel to expose the bus bars and wiring area.
3. Mounting: Position the BQD345 circuit breaker onto the designated bus bar connections in the panel board. Securely fasten the breaker using the bolt-in mechanism.
4. Wiring: Connect the load wires to the appropriate terminals on the circuit breaker. Refer to the breaker's label for correct wire sizing (e.g., for 45A, Cu-Al 60°/75°C wire, size 8 AWG for 45A). Ensure all connections are tight and secure.
5. Panel Reassembly: Once wiring is complete and verified, replace the panel cover.
6. Power Restoration: Restore power at the main service entrance.

For detailed wiring diagrams and specific panel compatibility, consult the panel board manufacturer's instructions and relevant electrical codes.

5. Operating Instructions

The BQD345 circuit breaker features a toggle handle that indicates its current status:

• ON: The handle is in the 'ON' position, indicating that power is flowing through the circuit.
• OFF: The handle is in the 'OFF' position, indicating that power to the circuit is disconnected.
• TRIP: If an overcurrent or short circuit condition occurs, the breaker will automatically move to the 'TRIP' position (typically a central position between ON and OFF). This indicates that the circuit has been interrupted for safety.

To reset a tripped breaker: First, move the handle completely to the 'OFF' position, then push it firmly to the 'ON' position. If the breaker immediately trips again, there is likely a persistent fault in the circuit that requires investigation by a qualified electrician.

6. Maintenance

Regular maintenance helps ensure the longevity and reliable operation of your circuit breaker. All maintenance should be performed by qualified personnel with power disconnected.

• Visual Inspection: Periodically inspect the circuit breaker and its connections for any signs of overheating, discoloration, loose wires, or physical damage.
• Cleaning: Keep the area around the circuit breaker clean and free of dust and debris. Use a dry, non-conductive cloth for cleaning.
• Testing: While not typically required for residential or light commercial applications, some industrial standards may require periodic testing of circuit breakers. Consult relevant standards and a qualified electrician for such requirements.

7. Troubleshooting

If your Siemens BQD345 circuit breaker is not functioning as expected, consider the following:

• Breaker Trips Frequently: This indicates an overcurrent condition or a short circuit in the protected circuit. Disconnect all loads from the circuit and try resetting the breaker. If it still trips, there is a fault in the wiring or a connected appliance. Consult a qualified electrician.
• Breaker Will Not Reset: Ensure the handle is pushed fully to the 'OFF' position before attempting to move it to 'ON'. If it still won't reset, or immediately trips, a fault is present.
• No Power to Circuit (Breaker ON): Check the main service panel for tripped main breakers. Verify all connections to the BQD345 are secure. If the issue persists, professional electrical diagnosis is required.

Do not attempt to force a breaker into the ON position if it resists or immediately trips. This can indicate a serious electrical fault.

8. Specifications

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 specific warranty terms and conditions, please refer to the official Siemens warranty documentation or contact Siemens customer support.

Customer Support:

For technical assistance, product inquiries, or warranty claims, please visit the official Siemens website or contact their customer service department. Ensure you have your product model number (BQD345) and any relevant purchase information available when contacting support.