Zener barrier Z779

Shunt safety barrier for intrinsically safe smoke detectors in the hazardous area

Characteristics

  • Must be installed between the RZ-24 central unit and the intrinsically safe smoke detectors in the hazardous area
  • It prevents excessive electrical energy from entering the hazardous area in the event of a fault in the non ATEX area, which could ignite explosive gases or dusts
  • ATEX Certificate: BAS 01 ATEX7 005
  • For its installation, there is the casing CI-K available

Product details

Technical data

Characteristics Zener barrier Z7792-channel, DC version, positive polarity
Supply voltagemax. 27 VDC
Fuse rating50 mA
Series resistancemin. 301 Ω / max. 327 Ω
Number of ex-proof detectors that can be connectedmax. 20 pieces of intrinsically safe detectors
IP ratingIP 20 / casing IP 65
Operating temperature-20 °C to +60 °C
Dimensions Zener barrier Z77912.5 x 115 x 110 mm
Material casing CI-Kglassfiber reinforced polycarbonate, bottom black, upper part grey, RAL 9005/7035

Dimensions

All dimensions in mm

Zener barrier Z779

Casing CI-K

Installation

Installation

The Zener barrier must be installed outside the hazardous area. Special models with pressure capsulated casings for the hazardous area are available on demand.

Gehäuse Zenerbarriere Rauchmelder Ex-BereichIf there is no suitable casing available on site (with a top hat rail according to EN 50222), we offer a separate casing with IP-rating 65. The Zener barrier is simply snapped onto the top hat rail of the casing.

Order information

Order Information

DescriptionPart No.
CI-K casing, not ex-proof040585
Z779 Zener barrier, 2-channel040589