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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 -55ºC to +85ºC, 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. The standard DC unit provides 3 tone stages, each stage has 28 tones available which can be independently selected. The unit can be controlled by reversing the polarity of the power supply (2 stage) or providing a common negative and switching between multiple positive supplies. The DB3B proves its versatility by additionally being able to work with a common positive supply and switching the negatives. The tone stages of the DB3B can also be controlled via voltage free contacts provided by a control panel.

The flexibility of the range continues with a wide range of supply voltages. The short flare option is worthy addition to the range offering a high SPL in a compact unit.

Listen to available sounder tones for this product

Data Sheets
Datasheet (315 KB) (PDF)
UL Datasheet (578 KB) (PDF)
Product Certificates
ATEX Ex d IIC Gas (3 MB) (PDF)
ATEX Ex de IIC Gas (945 KB) (PDF)
CQST Ex d Gas (1 MB) (PDF)
CQST Ex de Gas (2 MB) (PDF)
UL Cert of Compliance (242 KB) (PDF)
IP Certificate (475 KB) (PDF)
SIL 1 (50 KB) (PDF)
CCCF (217 KB) (PDF)
TR CU EMC (404 KB) (PDF)
CCOE (609 KB) (PDF)
Product Certificates – External Link
IECEx Ex de IIC Gas
Schematics / Wiring
GA (102 KB) (PDF)
Wiring Diagram (96 KB) (PDF)
UL GA (88 KB) (PDF)
UL Wiring Diagram (82 KB) (PDF)
Technical Manuals
TM261 DB3B UL (2 MB) (PDF)
TM330 DB3B Inmetro (1 MB) (PDF)


Area Classification Zone 1, Zone 2 and non-Ex use.
Certified Ambient Temperature -55°C to +85°C
Ingress Protection IP66 & IP67
Material Ex enclosure - Flame retardent, UV stable Glass Reinforced Polyester
Flare - Flame retardent, UV stable thermoplastic polyester

Up to 2 x M20 or 1/2" NPT. Blanking plug available.

Weight Ex d - 4.6kg, Ex de - 5.4kg (based on long flare unit)
No. of Tones 28 user selectable tones
Options Body 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



  • Ex d / Ex de IIC/IIIC T4/T5/T6.
  • ATEX certified.
  • IECEx certified.
  • INMETRO certified
  • TR CU certified
  • CCCF certified
  • CCOE certified
  • SIL1 certified
  • cULus certified
  • CCC certified
  • Certified temperature -55ºC to +85ºC.*
  • IP66 & IP67.
  • 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,
  • for further details contact MEDC.
  • 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