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 +70ºC, the exteriro enclosure is manufactured from GRP with a rugged thermoplastic flare providing a corrosion free and aesthetically pleasing product. Capable of producing 125dB @ 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.

Catalog Number DB3BULG048N2CPNR, DB3BULG120N2CPNR
Color Natural Black, Red, Special
Voltage 12–48 VDC, up to 254 VAC
Approvals UL listed for US and Canada for Class I, Div 2, Groups A–D, Class I, Zone 1, Ex d IIC, Class II, Div 2, Groups F and G, Zone 21, AEx tb IIIC, and Class III, Div 1
Certified Temperature –67°F to +158°F(–55°C to +70°C)
Material Glass Reinforced Polyester (GRP) with high-impact thermoplastic polyester
Weight 10 lb (4.6 kg)
Mounting Stainless steel bracket with ratchet facility
Entries Up to 2 x 1/2” NPT


  • Color: Red finish
  • NEMA 4x & 6, IP66 & 67
  • Integral volume control
  • Up to 115 dB output @ 10 ft
  • Certified Temperature:-67F to 158F
  • 4 wire monitored connection
  • 12 - 48 VDC, upt to 254 VAC
  • 28 output tones, user selectable