Siemens ED43B025 - 25 A, 480 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Engineered by Siemens for dependable, predictable protection, the ED43B025 is a 3-pole molded‑case circuit breaker designed for bolt‑on mounting in panelboards and load centers. Rated at 25 amps and 480 volts, it delivers robust overcurrent and short‑circuit protection for demanding commercial and light industrial environments.

• Bolt‑on mounting: a secure, vibration‑resistant bus connection that stays tight even in panels subject to equipment vibration.
• Thermal‑magnetic trip unit: provides stable, repeatable protection by combining thermal protection for gradual heating with magnetic action for fast response to short circuits.
• OEM panel compatibility: designed to work with Siemens OEM load centers and panelboards, simplifying replacement and service upgrades.
• Versatile applications: suitable for residential, commercial, and light industrial circuits that require 480V three‑phase protection and reliable fault clearing.

Key specifications

• Amperage rating: 25 A
• Voltage rating: 480 V
• Number of poles: 3
• Mounting style: Bolt‑on
• Type: Thermal‑magnetic molded case circuit breaker
• Application: Branch‑circuit overcurrent and short‑circuit protection

Why choose the ED43B025 for your panel

When panel space is at a premium and reliability matters, this 3‑pole bolt‑on breaker provides a solid, long‑lasting solution. Its bolt‑on design minimizes bus movement, reducing nuisance trips from vibration or loose connections. The thermal‑magnetic trip ensures you get precise protection that adapts to normal temperature variations while still delivering immediate interruption during a high‑fault event. For installers, the compatibility with Siemens load centers means fewer mismatched parts and quicker, safer replacements.

Practical use cases

• Commercial distribution panels where 480V three‑phase circuits drive conveyors, HVAC controls, and lighting systems.
• Industrial control panels requiring dependable branch‑circuit protection for motors and feeders up to 25 A.
• Residential–commercial transitions where building systems are phased into higher‑voltage panelboards.

Installation and maintenance tips

Ensure the mounting screws are properly torqued according to panelboard specifications to maintain a solid electrical connection. Periodically inspect the breaker for signs of wear, arcing, or overheating, and replace if you notice abnormal discoloration or a degraded trip curve. Keep spare ED43B025 units on hand for quick replacement during servicing to minimize downtime.