MEDC dGW 21 Signalling Bell


Ex de signalling bell – up to 105dB(A)

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Ex-Signalling bell dGW 21 / dRGW 21 – Up to 105dB(A)

The signalling bell dGW21 was designed to warn, call and signal in group II explosive atmospheres and rough environmental conditions in hazardous areas.

The signalling bell produces a sound volume of approx. 105dB(A) at 1 meter distance.

The frequency of the sound of the bell is approx 1kHz, meaning the signal can be clearly heard against lower frequency background noise. The bell can also be activated with the presence of a telephone ringing signal in the dRGW 21 version.

The protection of this product is a mixture of Exd “flameproof” for the driver system and Exe “increased safety” for the termination chamber. The dRGW 21 offers initiation by a relay from a telephone ringing voltage. The flameproof chamber contains the electromagnetic driver system and the enclosure is made from GRP (glass-fibre reinforced polyester), guaranteeing protection against corrosion. As the dGW 21 is safety class II, so there is no equipotential bonding necessary.
All D.C. versions are also equipped with an electronic contact breaker, increasing product service life.


  • ATEX II 2 G Ex de IIC T6
  • Housing made of glass-fibre reinforced polyester (GRP)
  • Volume: approx: 105 dB(A)
  • Protection: IP 66
  • Safety class II (no equipotential bonding necessary)
  • Version dRGW 21 with integrated telephone call relay
  • Integrated terminal box realized in Ex protection mode increased safety
Technical Specification
CertificationATEX, cULus
Protection ClassII 2 G Ex de IIC T6.
Certified Ambient Temperature-20°C to +40°C
Ingress ProtectionIP66
Entries1x M20 x 1.5 cable gland and 1 blind plug M20 x 1.5.
Weight5.5kg approx
OptionsVoltage, colour

MEDC dGW 21 Signalling Bell Datasheet