Siemens ED43B040 - 40 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens ED43B040 — a purpose-built 40A, 480V, 3-pole bolt-on molded case circuit breaker engineered to protect your panelboards and load centers with precision. When reliability and robust performance matter, this unit delivers dependable overcurrent and short-circuit protection for residential, commercial, and light industrial applications.

Secure bolt-on mounting for a dependable bus connection
The bolt-on design provides a rigid, vibration-resistant connection to the bus, helping prevent loose-terminals and reducing nuisance trips in demanding electrical environments.

Thermal-magnetic trip unit for stable protection
A thermal-magnetic trip mechanism delivers consistent, repeatable protection across a range of loads and fault conditions, quickly clearing faults while minimizing unnecessary interruptions.

OEM-ready compatibility
Designed to pair with matching Siemens OEM load centers and panelboards, ensuring a smooth fit, straightforward installation, and reliable long-term performance as part of a coordinated system.

Versatility for a variety of settings
With a 40A rating and 3-pole configuration for 480V systems, this breaker is well-suited for branch circuit protection in commercial spaces, light industrial environments, and residential installations that leverage three-phase power infrastructure.

What problems it solves
- Prevents damage to wiring, devices, and equipment by interrupting overcurrent conditions before insulation or components are compromised
- Reduces downtime by delivering fast, predictable fault clearance in panelboards and load centers
- Supports safe, compliant electrical distribution in multi-phase systems common in offices, retail, and light manufacturing

Technical snapshot

• Manufacturer: Siemens
• Part Number: ED43B040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 480V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal for professionals and DIY installers alike
Whether you’re upgrading a panelboard, refurbishing a commercial electrical room, or outfitting a new light industrial installation, the Siemens ED43B040 provides a dependable, plug-compatible solution that aligns with existing Siemens systems and ensures consistent performance across your distribution network.