The Rheem-Ruud 42-23116-09 3-Pole Sequencing Relay TPST-N/O is a dependable control component designed to manage the sequential activation of electrical circuits in HVAC heating systems. It functions by energizing heating elements or blowers in a timed order, ensuring smooth and efficient system operation. Commonly used in electric furnaces and heat pumps, this relay prevents circuit ... https://www.partshnc.com/24v-3pst-no-sequencing-relay