Is the Siemens Relay LGB 21 550A27 available from 3G Electric?

Yes — 3G Electric supplies genuine Siemens products with in-stock availability on common SKUs and worldwide shipping.

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Yes, our team of experienced engineers provides full technical support including product selection, installation guidance, commissioning, and after-sales service for all burner controls we distribute.

Siemens Relay LGB 21 550A27 - Burner Controls

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SiemensBurner Controls

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Siemens Relay LGB 21 550A27

Siemens LGB 21 550A27 is a burner control safety relay for gas or gas/oil burners up to 350 kW, supporting 1 or 2 stage operation with ionization probe or blue flame sensor flame detection. Ideal for industrial…

SKU 3G-CBM-05830

Also listed as: REL 15135 · REL-15135

Brand

Siemens

Item

Relay LGB 21 550A27

Technical Specifications

Siemens

type

LGB 21 550A27 

operation

intermittent 

fuel types

gas or gas/oil 

application

gas or gas/oil burner control safety relay 

power rating

up to 350 kW 

burner stages

1 or 2 stage 

flame detection

ionization probe or blue flame sensor QRC1 

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SG-based team

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Siemens Products

3G Electric (S) Pte. Ltd. — Singapore

Product Description

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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