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The EATON H2107B-3 is a thermal overload relay heater element designed for use with motor starters in sizes 00 through 0. Heater elements work inside thermal overload relays to sense motor current and trip the relay when sustained overcurrent conditions occur, protecting motors from heat damage and burnout. This element is installed by licensed electricians and industrial maintenance technicians as part of a properly sized motor protection circuit. At 0.15 pounds, it is a compact replacement component suited for panel and enclosure work where space is limited.
Heater elements such as the H2107B-3 are commonly used in light-duty motor control applications including small conveyor drives, pump starters, fan motors, and HVAC equipment motor circuits. Starter sizes 00 and 0 correspond to fractional and small integral horsepower motor loads in both residential and light commercial electrical systems. Proper heater element selection is based on the full-load amperage rating of the motor being protected, per NEC motor protection requirements.
Designed as an OEM-style replacement heater element for thermal overload relays used in size 00 through 0 motor starters.
Installation should be performed by a qualified electrician in accordance with NEC Article 430 motor circuit protection requirements. Disconnect and lock out all power to the motor control center or starter enclosure before removing or installing heater elements. Verify the heater element ampere rating matches the full-load amp rating of the motor per the manufacturer sizing chart before energizing. Do not bypass or omit heater elements in a thermal overload relay assembly.
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