The Schneider Electric Barber Colman M313A00 is a 24V Proportional Spring Return Normally Open Terminal Block, which is an important component in HVAC systems. This gadget is essential for managing and regulating particular HVAC system operations. The M313A00, which runs on a 24V power source, has a proportional spring return mechanism that guarantees accurate and proportionate contro... https://www.partshnc.com/24v-prop-sr-no-term-block