Siemens BQD145 - 45 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQD145 — a 45A, 277V, 1-pole bolt-on molded case circuit breaker engineered to safeguard your electrical systems. Built for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers, it delivers precise, reliable performance where it matters most.

Why the BQD145 stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, ensuring enduring electrical contact even in environments with movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance for both overloads and short circuits, helping prevent nuisance trips and protect connected loads.
• OEM-ready compatibility designed to pair with matching OEM load centers and panelboards, simplifying replacement and upgrades without compatibility concerns.
• Versatile application suitable for residential, commercial, and light industrial installations where 277V circuits are common, including commercial lighting and equipment feeds.

Key specifications

• Manufacturer: Siemens
• Part Number: BQD145
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Protect 277V branch circuits in commercial buildings, such as lighting feeders and receptacle circuits in offices, retail spaces, and schools.
• Upgrade or replace aging breakers in panelboards and load centers where a secure bolt-on connection is preferred for vibration-prone environments like mechanical rooms or equipment areas.
• Install in residential and light industrial settings where single-pole protection is appropriate for individual 277V circuits or equipment feeds.
• Ensure consistent protection in installations that demand robust, field-replaceable components with OEM compatibility.

With the Siemens BQD145, you get a purpose-built solution that aligns with standard panelboard configurations while delivering durable performance and precise protection for 277V single-pole circuits. Choose this bolt-on breaker when you need a dependable, OEM-compatible device that supports secure mounting, reliable trip behavior, and versatile use across residential, commercial, and light industrial applications.