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BQD390
Siemens presents the BQD390, a molded-case circuit breaker suited for three-phase applications, rated at 90 Amps for continuous current. Designed for 480Y/277 VAC systems, this breaker features a fixed thermal-magnetic trip mechanism, ensuring maximized protection in electrical systems.
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Technical specifications for BQD390
| Manufacturer | Siemens |
|---|---|
| Product Type | Molded-case Circuit Breaker |
| Product Line | BQD Series |
| Part Number | BQD390 |
| UPC | 783643277458 |
| Frame Capacity | 100 Amp frame |
| Continuous Current Rating | 90 Amp rating |
| Voltage Class | 480Y/277 VAC |
| Poles | 3 Poles |
| Phase Application | 3-phase circuits |
| Interrupting Capability | 14 kA interrupt rating |
| Trip Mechanism | Thermal-magnetic trip |
| Trip Adjustability | Fixed (non-adjustable) |
| Actuation Method | Toggle handle |
| Mounting Application | Panelboard mounting |
| Conductor Size Range | 8–1 AWG Cu, 6–1/0 AWG Al |
| Frequency Compatibility | 50/60 Hz |
The BQD390 from Siemens is an integral component of the BQD Series, specifically identified as a molded-case circuit breaker. This unit is capable of handling a continuous current rating of 90 Amps and is housed within a robust 100 Amp frame capacity. Operating at a voltage class of 480Y/277 VAC, this model is intended for utilization in three-phase circuits.
The breaker is configured with three poles, ensuring it can effectively manage multiple conductors in a circuit. With an interrupting capability of 14 kA, it is fitted to handle significant fault conditions safely. The thermal-magnetic trip mechanism is fixed in nature, offering dependable protection against overloads and short circuits without the need for adjustment.
Featuring a toggle handle for actuation, this circuit breaker enables straightforward operation. For installation, it is designed for panelboard mounting, providing a secure fit within electrical control panels. It supports a conductor size range, accommodating 8–1 AWG for copper and 6–1/0 AWG for aluminum wiring. Additionally, the BQD390 is compatible with a frequency range of 50 to 60 Hertz, making it flexible for various applications in industrial settings.
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