Fema PTSRB0101V3 pressure switch

This Fema PTSRB0101V3 pressure switch is a component used in burner and boiler safety systems. Parts of this type confirm that pressure or airflow in the system is within the permitted band; the burner control receives a signal and is allowed to continue the ignition sequence. The specific function depends on where the switch is installed: an air pressure switch proves that the fan is moving air during pre-purge, while a gas pressure switch guards against minimum or maximum gas pressure. This article is listed under the Fema brand with manufacturer code PTSRB0101V3 and catalogue article 444.676.029. When selecting a replacement pressure switch, the medium (air or gas), switching range and differential, connection thread or hose spigot, contact rating, and approval class must match the original. No further technical details for this particular article are provided in the catalogue data, so the engineer should verify the existing switch’s markings and compare them against the specifications of this Fema model. Typical failure modes for switches of this type include a torn diaphragm, blocked impulse tube, or drifted setpoint, all of which can cause burner lockouts that may be mistaken for ignition problems. Proper installation and a functional impulse line are essential for reliable operation.