Siemens ED63A003 - 3 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens ED63A003 — a compact, rugged 3-pole bolt-on molded case circuit breaker designed to protect your branch circuits in panelboards and load centers. Rated at 3 A and 600 V, it delivers dependable overcurrent and short-circuit protection for residential, commercial, and light industrial electrical systems. The secure bolt-on mounting ensures a rigid, vibration-resistant bus connection, maintaining consistent protection even in environments with movement or vibration. Available from AmpState.

Why this matters

• Secure bolt-on mounting creates a robust, vibration-resistant connection to the bus bars, reducing the risk of loose connections and arcing in challenging installation environments.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding to both overloads (thermal) and short-circuit events (magnetic), helping you avoid nuisance trips while safeguarding wiring and equipment.
• Three-pole configuration delivers balanced protection across three phases, ideal for modern panelboards and load centers in multi-phase installations.
• OEM-compatible design ensures seamless integration with matching Siemens OEM load centers and panelboards, simplifying upgrades and replacements without compatibility concerns.

Technical snapshot

• Manufacturer: Siemens
• Part Number: ED63A003
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 3 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• New installations and replacements in Siemens panelboards and load centers requiring reliable 3-pole protection
• Residential, commercial, and light industrial control panels where compact, secure bolt-on mounting is advantageous
• retrofit projects where existing OEM compatibility and consistent protection curves matter

Practical considerations and benefits

The ED63A003 delivers a clear protection advantage in environments that experience vibration or movement, thanks to its bolt-on connection that maintains a solid bus interface. The combination of thermal and magnetic trip elements offers dependable coordination—tripping promptly on severe short circuits while minimizing nuisance trips due to gradual temperature changes. Its 3 A rating is suitable for protecting branch circuits that require precise current limiting without sacrificing fast fault clearance in panelboards and load centers.

How it compares and why it’s a smart choice

Compared to generic circuit breakers, the ED63A003 is designed to integrate seamlessly with Siemens panel ecosystems, ensuring consistent electrical performance, reliable trip characteristics, and straightforward maintenance. Its molded-case construction provides durability in compact form factors, making it a practical choice for upgrades, panel reconfigurations, or new builds where dependable, code-compliant protection is essential.