Siemens HED41B040L - 40 A, 277 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens HED41B040L is a 40‑amp, 277‑volt, 1‑pole bolt‑on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. Built for consistent performance, it combines a rugged bolt‑on mounting with a thermal‑magnetic trip system to guard against both overloads and short circuits, keeping electrical systems safe and downtime to a minimum.

Why this breaker stands out

• Secure bolt‑on mounting creates a rigid, vibration‑resistant bus connection, reducing the risk of loose connections that can lead to intermittent outages or nuisance trips.
• Thermal‑magnetic trip unit delivers stable, repeatable protection by reacting to both gradual overcurrents and instantaneous short‑circuit events, helping protect wiring and devices downline.
• OEM compatibility designed to pair with Siemens matching OEM load centers and panelboards, ensuring a clean fit and reliable electrical performance in existing systems.
• Versatile application suitable for residential, commercial, and light industrial environments, making it a practical choice for upgrades, remodels, or new installations.

What it protects and how it helps you

In everyday terms, this 1‑pole, 40A breaker provides two critical protections in one compact device. First, it limits continuous current to prevent overheating of conductors and connected equipment. Second, it detects dangerous short‑circuit conditions and interrupts power quickly to minimize damage and reduce the risk of fire. With a 277V rating, it’s well suited for systems that operate at higher line voltages typical in commercial or specialized installations, while still fitting standard panelboard footprints.

Key specifications at a glance

• Manufacturer: Siemens
• Part number: HED41B040L
• Amperage rating: 40 A
• Voltage rating: 277 V
• Poles: 1‑pole
• Mounting style: Bolt‑on
• Type: Thermal‑magnetic molded case circuit breaker
• Applications: Branch circuit overcurrent and short‑circuit protection in panelboards and load centers

Ideal use cases

• Upgrading a residential service panel to handle higher demand or to balance loads more effectively
• Installing or expanding commercial lighting and receptacle circuits in small to mid‑sized facilities
• Protecting critical branch circuits in light industrial environments where reliability matters
• Replacing aging breakers in Siemens OEM panels to maintain certification and compatibility

Practical guidance for installation and operation

Choose this breaker when you need robust, straightforward protection with a secure connection. Its bolt‑on design simplifies mounting to compatible bus bars, and the thermal‑magnetic trip ensures predictable behavior across a range of temperatures and load conditions. For best results, pair it with Siemens panelboards or load centers specified by your electrical design, verify correct voltage and amperage ratings for the circuit, and follow all applicable electrical codes during installation.

Why choose AmpState for Siemens breakers

AmpState offers genuine Siemens components designed for long‑term reliability in demanding environments. This HED41B040L bolt‑on breaker provides the exact protection profile you need for safe, compliant electrical distribution—delivered with clear documentation, readily available stock, and fast shipping to keep your project on schedule.