Siemens BQD170 - 70 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQD170 is a rugged, single-pole bolt-on molded case circuit breaker engineered to protect essential branch circuits in panelboards and load centers. With a 70 A rating and 277 V operation, this unit is purpose-built for reliable overcurrent and short-circuit protection in a variety of settings—from home electrical panels to commercial spaces and light industrial installations.

Key advantages that matter in the field

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the busbar, helping maintain consistent electrical performance in environments where movement or vibration is common.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload protection with fast magnetic tripping for short circuits, reducing nuisance trips while preserving safety.
• OEM-compatible design is designed to work with matching Siemens OEM load centers and panelboards, ensuring straightforward installation and reliable overall system integration.
• Versatile application suitable for residential, commercial, and light industrial projects, making it a flexible choice for various distribution schemes.

Technical snapshot

• Manufacturer: Siemens
• Part Number: BQD170
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70 A
• Voltage Rating: 277 V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker matters for your electrical system

Outfitting a panelboard or load center with the BQD170 ensures you have a dependable line of defense against electrical faults. The bolt-on design minimizes the risk of bus connection loosening in installations subject to vibration or movement, while the thermal-magnetic protection provides precise tripping behavior that you can count on during both routine loads and fault conditions. By aligning with Siemens OEM hardware, this breaker helps you maintain consistent protection across your distribution network without compatibility questions.

Ideal use scenarios

• Upgrading or replacing a single-pole protection device in a 277 V commercial lighting circuit or other 277 V branch circuits
• Installing in new-build or retrofit panelboards where Siemens BQD-series compatibility is required
• Electrical rooms in small offices, retail spaces, or light industrial facilities that demand reliable, long-term protection from overcurrent and short circuits

With the Siemens BQD170, you’re choosing a focused, performance-driven solution that prioritizes secure mounting, dependable protection, and seamless compatibility—delivering peace of mind for electrical distributions from simple residences to modest commercial environments.