Siemens QRA Series
Siemens QRA Series includes UV flame detectors used for ultraviolet flame supervision for gas and oil burners with compatible Siemens burner controls. This guide compares common models, naming logic, selection checks, and related model pages.
What Is the QRA Series?
The Siemens QRA Series family is a focused product group within Siemens burner accessories. Engineers usually evaluate these models by application fit, electrical and mechanical compatibility, replacement risk, and the original burner control sequence.
Model Naming Logic
QRA suffixes identify detector design, viewing head configuration, sensitivity, connection style, and environmental protection details.
Common Models in This Series
| Model | Type | Key Data | Page |
|---|---|---|---|
| QRA2 | Flame Detector | Flame Detectors | View specs |
| QRA2M | Flame Detector | Flame Detectors | View specs |
| QRA4.U | Flame Detector | Flame Detectors | View specs |
| QRA4M.U | Flame Detector | Flame Detectors | View specs |
| QRA10.C | Flame Detector | Flame Detectors | View specs |
| QRA10M.C | Flame Detector | Flame Detectors | View specs |
| QRA53.E17 | Flame Detector | AC 100-110V | View specs |
| QRA53.E27 | Flame Detector | AC 220-240V | View specs |
| QRA53.G17 | Flame Detector | AC 100-110V | View specs |
| QRA53.G27 | Flame Detector | AC 220-240V | View specs |
| QRA55.E17 | Flame Detector | AC 100-110V | View specs |
| QRA55.E27 | Flame Detector | AC 220-240V | View specs |
| QRA55.G17 | Flame Detector | AC 100-110V | View specs |
| QRA55.G27 | Flame Detector | AC 220-240V | View specs |
| QRA73.A17 | Flame Detector | AC 100-110V | View specs |
| QRA73.A27 | Flame Detector | AC 220-240V | View specs |
| QRA75.A17 | Flame Detector | AC 100-110V | View specs |
| QRA75.A27 | Flame Detector | AC 220-240V | View specs |
FAQ
What does a Siemens QRA detector sense?
QRA detectors sense ultraviolet radiation from a flame and send the supervision signal to a compatible burner control unit.
Can a QRA detector replace a QRB or QRC detector?
Not directly. UV, visible-light, and infrared detector systems use different sensing principles and controller inputs.