Siemens BQD370 - 70 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQD370 is a 70A, 480V, 3‑pole bolt‑on molded case circuit breaker designed to protect branch circuits in panelboards and load centers. Its bolt‑on mounting delivers a rigid, vibration‑resistant connection to the bus, enhancing reliability in demanding electrical environments.

• Secure bolt‑on mounting: creates a solid mechanical connection that resists loosening from vibration, reducing maintenance concerns in busy electrical rooms.
• Thermal‑magnetic trip unit: provides stable, repeatable protection by responding to both overload (thermal) and short‑circuit (magnetic) events with rapid, predictable tripping behavior.
• Three‑pole design for 480V systems: delivers comprehensive three‑phase protection ideal for modern commercial and light industrial applications.
• 70A rating: well suited for feeders and mid‑sized branch circuits within panelboards and load centers.
• OEM panel compatibility: designed to be compatible with matching Siemens OEM load centers and panelboards, simplifying replacement projects and stocking decisions.
• Versatile applications: suitable for residential, commercial, and light industrial installations where reliable overcurrent and short‑circuit protection is required.

Technical snapshot

• Manufacturer: Siemens
• Part number: BQD370
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage: 70 A
• Voltage: 480 V
• Poles: 3
• Mounting style: Bolt‑on
• Application: Branch circuit overcurrent and short‑circuit protection

Practical use cases

• Install or upgrade a 3‑phase panelboard in a small commercial facility requiring a robust 70 A feeder.
• Replace aging or incompatible breakers in compatible Siemens/OEM panels without altering the panel footprint.
• Provide a reliable 480 V distribution point in light industrial installations where space and performance matter.

Why this breaker stands out: the Siemens BQD370 combines a secure bolt‑on mount with a dependable thermal‑magnetic trip system, all in a 3‑pole 480V package that’s designed to work seamlessly with Siemens OEM panels. It’s a purpose‑built choice for technicians who value installation reliability, panel compatibility, and predictable protection behavior in demanding environments.