Allen-Bradley 837-H2A Temperature Control Unit

Allen-Bradley 837-H2A Temperature Control Unit is a rugged electro-mechanical temperature switch designed for direct horizontal immersion in indoor enclosures (NEMA Type 1) and is part of the 837 temperature controls family. It uses a bellows sensing element with a vapor-pressure fill to actuate a mechanical switch, with factory-set trip and reset settings and a defined minimum differential. For the 837-H2A, temperature specifications span approximately 140 to 290 °F with an adjustable differential roughly 7 to 52 °F and a maximum rated temperature around 340 °F. The enclosure is Type 1 and Style H (direct horizontal immersion), making it suitable for indoor industrial environments where reliable temperature control is needed.