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SiemensBurner Controls

Siemens Relay LFL 1.133

SKU 3G-CBM-05815

Also listed as: REL 15110 · REL-15110

Brand

Siemens

Item

Relay LFL 1.133

Technical Specifications

Siemens

burner type

gas, oil, or bi-fuel 

operation mode

intermittent (shutdown by regulation minimum 1× per 24 h) 

series variants

01 and 02 (differ by ignition safety time duration) 

air damper control

yes

high power variant

LFL1.638 for large atmospheric burners 

burner control type

multi-stage or modulating 

burner power rating

medium to large 

burner configuration

single or dual tube 

lfl1 638 application

large atmospheric burners 

controlled air damper

yes

probe cable max length

see technical characteristics 

uv probe configuration

up to 2 probes in parallel possible 

application suitability

hot air generators 

safety time second phase

t9

flame supervision sensor uv

QRA type 

unlock function max duration

10 s 

unlock button operating force

≤ 10 N 

terminal grounding requirement

terminal 22 to earth when using QRA type sensors 

dual sensor operation restriction

only one sensor active except during 2nd safety time (t9) 

flame supervision sensor ionization

yes

ionization probe contact protection

not protected against accidental contact 

probe signal transmission requirement

separate low-capacitance cable required 

installation requirement ignition cable

separate installation, maximum distance from apparatus and other cables 

View Full Spec Sheet

Technical Documents

(1)

Technical Document 1

PDF Document

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Siemens Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Siemens Relay LFL 1.133 is a burner control unit designed for gas, oil, or bi-fuel burners rated medium to large, supporting single or dual tube configurations. Operating in intermittent mode with shutdown regulation minimum 1× per 24 h, it provides multi-stage or modulating burner control with air damper regulation. The LFL 1.133 series is available in variants 01 and 02, differentiated by ignition safety time duration, and accommodates UV flame supervision via QRA type sensors (up to 2 probes in parallel) or ionization sensors. 3G Electric supplies this Siemens control relay for industrial heating applications across Singapore and Southeast Asia.

Used in

Common applications for Siemens

District cooling plants — LME73 + RWF55 for condenser-water modulation

Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper

Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers

Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids

Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens burner controls. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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