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The HDA36125 is a high-performance Square D 3-Pole 125A I-Line Breaker, designed for reliable circuit protection in commercial and industrial applications. With a voltage rating of 600V, this breaker ensures optimal performance and safety in electrical systems. Ideal for demanding environments, it guarantees consistent functionality and durability.
The HDA and HDB are both Square D I-Line molded-case frames, but they differ in interrupting capacity and may have different physical dimensions. The HDA36125 is rated at 14kA at 600V. HDB-frame breakers carry a higher interrupting rating. They are generally not interchangeable — always verify that the replacement frame matches the original breaker's frame designation and the panelboard's bus rating before substituting.
Square D has transitioned many HDA-frame products to newer series over the years, and availability can be limited through standard channels. Northern Breaker Group specializes in obsolete and hard-to-find breakers — we maintain stock of legacy Square D I-Line devices and can source the HDA36125 for you. Contact our Calgary, Edmonton, or Vancouver counter, or request a quote online.
Many Square D HDA-frame breakers are designed to accept factory-installed or field-installable accessories such as shunt trips, under-voltage releases, and auxiliary contacts, depending on the specific catalog suffix. The base HDA36125 should be verified for accessory compatibility against the Square D HDA frame accessory catalogue. Let us know what accessory you need and we can help confirm compatibility or source the correctly configured unit.
