MEDC DB3B Sounder


Up to 122dB, Ex d(e), Weatherproof

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DB3B sounders range up to 122dB

The DB3B is a high power explosion proof sounder, introduced as a replacement for the current DB3 with improved
functionality and performance. Certified for use in a wide range of temperatures from -55°C to +70°C the Ex enclosure is manufactured from GRP with a rugged thermoplastic flare providing a corrosion free and aesthetically pleasing product.

Capable of producing 122dB @ 1m and with a range of pre-recorded tones, the DB3B includes an integral volume control
which is ideal when a lower output is required.

The unit is provided with versatile control options allowing compatibility with a wide range of control methods and PLCs.


  • Ex d / Ex de IIC/IIIC T4/T5/T6
  • ATEX certified
  • IECEx certified
  • UL certified for USA and Canada
    • Cass I, Div 2, Groups A-D
    • Class I, Zone 1, Ex d IIC/AEx d
    • IIC Gb
    • Class II, Div 2, Groups F & G
    • Zone 21, AEx tb IIIC
    • Class III, Div. 1
    • Fire alarm and general use
  • TR CU certified
  • CQST certified
  • CCOE certified
  • Chinese Compulsory Certification for Fire systems (CCCF) certified
  • INMETRO certified
  • SIL 1 certified
  • CSFM certified
  • Certified temperature: –55°C to +70°C (model dependent)
  • IP66 & IP67/NEMA 4X & 6
  • Optional Ex e terminal chamber
  • Up to 122dB output @ 1m
  • Integral volume control
  • 28 tones, user selectable
  • 3 stage unit remotely switchable
  • Tones can be programmed to customer’s specification
  • DC supply voltage between 12V and 48V
  • End of line resistor option
  • Sounder & beacon combination units available
  • Ex enclosure – glass reinforced polyester
  • Flare – high impact thermoplastic polyester
  • Stainless Steel mounting bracket and cover screws
  • Mounting bracket has ratchet facility as standard
  • Optional swivel bracket available
Technical Specification
Area ClassificationZone 1, Zone 2 and non-Ex use.
Certified Ambient Temperature-55°C to +70°C
Ingress ProtectionIP66 & IP67
MaterialEx enclosure – Flame retardent, UV stable Glass Reinforced Polyester
Flare – Flame retardent, UV stable thermoplastic polyester
EntriesUp to 2 x M20 or 1/2″ NPT. Blanking plug available.
WeightEx d – 4.6kg, Ex de – 5.4kg (based on long flare unit)
No. of Tones28 user selectable tones
OptionsBody colour, short flare, tag & duty labels, custom tones
EOL resistor, certification, suitable for Gas or Gas and Dust,  Ex atmospheres, terminal chamber,
voltage free activation, voltages 12V-48V d.c., 110V-254V a.c

MEDC DB3B Sounder Datasheet