Overview
The Siemens BQ1-B020 is a 1-pole, 20A thermal-magnetic molded case circuit breaker designed for low-voltage AC electrical systems and commercial power distribution. It delivers reliable thermal-magnetic trip protection with a 10kAIC rating at 120/240VAC. This breaker uses a bolt-on mounting connection and includes load-side lugs, providing a secure interface with panelboard bussing systems.
Key Features
- Breaker is SWD, HID, and HACR rated, making it suitable for lighting and HVAC loads.
- Accepts 14-6 AWG copper or 12-6 AWG aluminum wiring for flexible installation.
- Equipped with LI – Long-Time and Instantaneous functions, delivering dependable performance across typical residential or light commercial load profiles.
- Manual toggle allows straightforward ON/OFF control and reset after a trip event.
- Non-interchangeable trip unit for safety and reliability.
Technical Specifications
| Part Number | BQ1-B020 |
| Manufacturer | Siemens (ITE) |
| Number of Poles | 1 |
| Amperage Rating | 20A |
| Voltage Rating | 120V AC |
| Interrupting Capacity | 10 kA @ 120V |
| Trip Function | Long-Time and Instantaneous (LI) |
| Protection Type | Thermal Magnetic |
| Connection Type | Bolt-On with Load-Side Lugs |
| Wire Size | 14-10 AWG Copper / 12-10 AWG Aluminum |
| Frequency | 60 Hz |
| Operating Temperature | 40°C |
| Dimensions | 3.75″ H × 1″ W × 2.37″ D |
| Weight | 0.25 lbs |
| UPC | 783643102323 |
Typical Applications
The Siemens BQ1-B020 is suitable for electrical distribution and general purpose applications including:
- Residential and light commercial electrical distribution panels
- Lighting circuit protection
- HVAC equipment circuits
- Maintenance and retrofit installations in existing Siemens panelboards
- Industrial control circuits and motor starter circuits
Compatibility & Replacements
Compatible With
- Siemens P1, P2, and P3 panelboards
- BQ series molded case circuit breaker panelboards
- 120V AC electrical distribution systems rated 60 Hz
- Industrial control and automation systems
Replaces / Drop-In Replacement For
The Siemens BQ1-B020 is the current standard for BQ-series 1-pole 20A applications. For discontinued or previous versions, verify compatibility with your system integrator before ordering, as direct replacements depend on your specific panel configuration and trip characteristics.
Works With
- Siemens ITE molded case breaker panelboards and loadcenters
- NEMA 1 (indoor) and NEMA R (outdoor) rated enclosures
- Standard electrical distribution wiring (copper and aluminum)
- Manual ON/OFF toggle operation compatible with all standard panel designs
