Cutler-Hammer C306DN3 Three-Phase Thermal Overload Relay

The Cutler-Hammer C306DN3 is a three-pole thermal overload relay rated for 600V, and it is listed under the Series B1 family. The model name C306DN3 identifies the unit, aligning with its 3-pole configuration intended for three-phase electrical protection schemes. This device operates as a thermal overload relay, delivering overload protection by interrupting current in response to excessive heat in the protected circuit, a fundamental role for protective relays in electrical control systems. The information provided specifies a 600V rating and a 3-pole design, which are the key specifications that inform compatibility with 3-phase circuits and industrial electrical installations requiring thermal overload protection. By design, this Cutler-Hammer relay belongs to a lineage of protective relays within the brand’s catalog, with the Series B1 designation indicating its place in that product family.