SiemensBurner Controls
Siemens Relay Lfl
14 sizes & variants — select below · Application: 11 options
Siemens Relay LFL 1.148 is a burner control safety relay for gas, oil, and dual-fuel applications supporting multi-stage or modulating burners. It features UV probe QRA and ionization probe flame monitoring, suitable…
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From the manufacturer's datasheet
SiemensSafety time for ignition burner
Series 01 and 02 differ in safety time for ignition burner with gas valve for ig
Variant for atmospheric burners
LFL1.638 for high-power atmospheric burners
Operation mode
Intermittent operation (shutdown by controller at least once every 24 h)
Burner configuration
For single or dual tube burners
Flame monitoring options
UV sensor type QRA... and ionization probe
Parallel connection of UV sensors
Possible to connect 2 UV sensors type QRA... in parallel
Grounding requirement
Terminal 22 must be grounded when using QRA...
Reset button force
Manual operation only, force ≤ 10 N
Features
- For gas, oil, or dual-fuel burners of medium to high power
- For multi-stage or modulating burners with intermittent operation
- With controlled air damper
- Flame monitoring with UV sensor (QRA...) and/or ionization probe
- Suitable for hot air generators
Typical applications
Control and monitoring of single or dual tube burnersMedium to high power burnersIntermittent operation (shutdown at least once every 24 hours)Multi-stage or modulating burners
Do not open the device or perform any intervention on it.
Do not press the reset button for more than 10 seconds, as prolonged unlocking destroys the blocking relay.
Select a size
Showing 14 / 14 variants — scroll the table for more
| Part No (MPN)— | 3G SKU3G-CBM-05815 | Application— | |
| Part No (MPN)— | 3G SKU3G-CBM-05816 | Applicationgas, oil or dual-fuel burners | |
| Part No (MPN)— | 3G SKU3G-CBM-05817 | ApplicationMulti-stage or modulating burners | |
| Part No (MPN)— | 3G SKU3G-CBM-05818 | ApplicationGas, oil, or dual-fuel burner control | |
| Part No (MPN)— | 3G SKU3G-CBM-05819 | Applicationmedium to high power gas/oil/dual fuel burners | |
| Part No (MPN)— | 3G SKU3G-CBM-05820 | Applicationgas, oil or dual-fuel burners | |
| Part No (MPN)— | 3G SKU3G-CBM-05821 | Applicationgas/oil/dual-fuel burner control | |
| Part No (MPN)— | 3G SKU3G-CBM-05822 | Applicationgas, oil or dual-fuel burners medium to high power | |
| Part No (MPN)— | 3G SKU3G-CBM-05823 | Application— | |
| Part No (MPN)— | 3G SKU3G-CBM-05824 | Applicationburner control safety relay | |
| Part No (MPN)— | 3G SKU3G-CBM-05825 | ApplicationGas, oil, or dual-fuel burners | |
| Part No (MPN)— | 3G SKU3G-CBM-05826 | Applicationatmospheric burners high power | |
| Part No (MPN)— | 3G SKU3G-CBM-05827 | ApplicationMedium to large power burners with modulating or staged operation | |
| Part No (MPN)— | 3G SKU3G-CBM-05839 | ApplicationGas, oil or dual-fuel burners, medium to large power |
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Frequently Asked Questions
What is the difference between series 01 and 02?
They differ in the safety time for the ignition burner with gas valve for ignition gas.
Can two UV sensors be connected?
Yes, two UV sensors of type QRA... can be connected in parallel.
What is the requirement for the reset button?
It must be operated manually with a force ≤ 10 N, without tools or sharp objects.
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