Product Description

SIEMENS LFE10

The Siemens LFE10 is a flame safeguard control unit designed for the supervision of forced draft gas burners of intermittent operation (non-permanently operating burners). It provides flame monitoring using either an ionization probe or a UV flame detector QRA… ensuring safe burner start-up and shutdown sequences. The LFE10 checks for the presence of a flame during operation and controls the fuel valve accordingly, initiating a safety shutdown if the flame is lost or if fault conditions occur.

Technical Specifications:

Operating voltage: AC 220 V –15 %…AC 240 V +10 % or AC 100 V –15 %…AC 110 V +10 % (depending on model variant)
Mains frequency: 50…60 Hz ±6 %
Power consumption: Approx. 3 VA
Safety time (TSA max.): Varies by model (e.g., 1s, 2s, 3s, 5s, 10s)
Permissible ambient temperature: -20…+60 °C
Flame detector compatibility: Ionization probe or UV flame detector QRA…
Required detector current (min.): 1 µA (Ionization), 70 µA (UV operation with QRA…)
Degree of protection: IP40 (when built into a housing/panel)
Mounting position: Optional
Weight: Approx. 180g