Siemens LGB21.350 A27 230v Burner Control Box

Manufacturer: Siemens
Product Type: Control Box
Siemens LGB21.350 A27 230v Burner Control Box

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SKU: PHP2637

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Siemens LGB21.350 A27 Burner Control Box 230V


The LBG21.350 control box features undervoltage detection and air pressure supervision with a functional check of the air pressure switch during startup and operation.

Depending on the type of burner control used, the flame is supervised either by an ionization probe, a blue-flame detector QRC1 for forced draft gas/oil burners, or a UV detector QRA (with auxiliary unit AGQ1.A27).

In the event that the mains voltage drops below about AC 165 V, an electronic circuit ensures that the gas burner control will prevent burner startup or – without releasing fuel – lockout will be initiated.

LGB21.350 In Use

LGB21.350 A27 Burner Control Box Applications

Applications in accordance with EN 676: Automatic forced draft burners for liquid fuels. The LGB21.350 A27 is designed for use with gas burners of small to medium capacity, with or without an auxiliary fan, in intermittent operation. The LGB21 is used for the supervision, startup and control of 1- or 2-stage gas burners. As well as for gas burners/oil burners of small to medium capacity (typically up to 350 kW), with or without a fan in intermittent operation.

Burner controls have a designed lifetime of 250,000 burner startup cycles which, under normal operating conditions in heating mode, correspond to approx. 10 years of usage


  • The LGB's housing is made up of heat resistant and flame retardant plastic.
  • Supply Voltage: 230VAC
  • IP Rating: IP40
  • Operation Temperature: -20 - +60 °C
  • Mounting Position: Optional
  • Weight: Approx. 160g
Siemens LGB21.350 Dimensions

Siemens LGB Dimensions

In terms of dimensions, the LGB21.350 A27 burner control boxes are identical to the LME, and LMG control boxes.

Control Box Height Width Depth
LGB21.130 A27 230V 54mm 91mm 62.5mm
LGB21.350 A27 230V 54mm 91mm 62.5mm
LME21.330 A27 230V 54mm 91mm 62.5mm


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