DUK Pullcord switch, ATEX Zone 21 LHPEw-18/1EX-B

DUK Pullcord switch, ATEX Zone 21 LHPEw-18/1EX-B

NEW Item
Manufacturer Part Number: LHPEw-18/1EX-B

Variant:

For use in zone 21 ATEX approval

• Device group II
• Category 2D
• Corrosion-free GRP housing
  • or made of cast iron
• IP67
• Snap action
• Forced opening
• Silver or gold contacts

• with Dupline Bus from Carlo Gavazzi
• with indicator light

The design of these pullcord switches considerates heavy duty service. The housings made of most stable, impact resistant, thick-walled fibreglass-reinforced polyester are the best guarantors for long years of reliable service. Both types are IP67 protected (water- and dust proof).

They comply with the demands of the European standard EN 60079-31. By their certification and marking with II 2D Ex tb IIIC Db IP67 T80°C they are approved for use in areas under conductive dust. They comply also to all other applicable European standards and are marked with the CE-mark.

Pullcord switches of this type are for double-sided rope mounting (left and right) with a rope length of max 2 x 50 metres. Pulling on one of these ropes operates all contacts by snap action independent on the direction of actuation. Simultaneously with the operation the latching is effected automatically for manual reset. When tripped, the actuation lever remains in the actuated position, displaying that the switch is tripped and indicating the direction from where the emergency stop demand was executed .

Secure opening of each NC-contact is guaranteed by the direct opening system (positive drive of each NC-contact). For decreasing the electrical contact resistance all contacts perform a self-cleaning action with every operation. The contacts are made of silver and get optionally a gold surface. For best contact safety at lowest tensions and low currents (cross resistance) the gold contacts are recommended.

The unrivalled long pullcord travel necessary for actuation and the large force necessary for pulling prevent unwanted stops caused by solids falling onto the pullcord.

The guarantors for an extended, reliable working life are most important details like double lipped sealing rings tightening the shafts, the lid gasket made of extra hard rubber, shafts made of stainless steel, screws made of stainless steel, loss-protected housing cover screws.

Technical Data

• Conforms to standards EN 60079-0 / EN 60079-31 / EN 60 947-5-5EN 60204 / EN 60529
• Switches are marked II 2D Ex tb IIIC T80°C Db
• Contacts Up to 4 NC plus 4 NO, independent on the direction of actuation
• Contact rating
  • Silver: max 230 VAC 4 A /24 VDC 4 A
  • Gold: minimum 1mA @ 6VDC
• Utilization category
  • Silver: AC-15 230V 1A, DC-13 110V 0,5A
  • Gold: AC-12 230V 250mA, DC-12 110V 250mA
• Ambient temperature Tamb -50°C up to +70°C (with signalling lamp “S”-35°C up to 50°C )
• Max. temperature on surface of housing 80°C
• Rope force for actuation › 35 N
• Cable entry 2 x M25, ex works closed by IP67-plugs
• Cable cross section min1,5mm²
• Enclosure
  • LHP… Fibre glass reinforced polyester (BMC)
  • LHM… Cast iron
• Protection IP 67
• Colour of enclosure
  • LHP… black,
  • LHM… yellow, optional other
• Weight 2.0 kg (LHP...), 6 kg (LHM....)
• Mounting position free, 2 slotted holes for M10-screws

• B10 80000 switching cycles
• Share of dangerous faults 0,2