Eaton H2008B-3 Thermal Unit 3.23-5.23A PK3

Eaton H2008B-3 Thermal Unit

The Eaton H2008B-3 is a bimetallic thermal unit rated for full-load currents between 3.23 and 5.23 amperes. It suits motor-control panels that use NEMA sizes 00 through 0 Series C or NEMA sizes 1 through 2 Series B starters. Each pack supplies three identical units for spares or multi-starter projects. Maintenance engineers and panel builders select this part when overload protection must match those exact ampere limits.

Thermals noise and power

The unit operates by bimetallic sensing, so it generates no audible fan noise and draws no control power of its own. Heat dissipation is limited to the starter’s normal conductor losses; the device itself adds negligible thermal load to the enclosure. Ambient temperature compensation follows the inherent bimetallic curve without external circuitry. Installers should verify that the surrounding cabinet airflow matches the starter manufacturer’s derating guidelines.

Current range 3.23 to 5.23 A

The decisive specification is the adjustable trip band of 3.23 to 5.23 amperes; the unit will not protect motors whose full-load current falls outside this window. Buyers needing a lower or higher range must choose a different thermal-unit rating. The part is not suited for solid-state overload relays or electronic motor-protection modules that require a separate sensor input. Compatibility is limited to the NEMA starter series listed in the data.