Z728 Type 1-channel Zener safety barrier
1-channel, DC type, positive polarity, working voltage 26.5 V @ 10 µA, series resistance max. 327 Ω.
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Pepperl+Fuchs Z728 type Zener barrier, 1-channel, DC type, positive polarity, working voltage 26.5 V @ 10 µA, series resistance max. 327 Ω, fuse rated current 50 mA.
Part of the Zener barrier series, limiting voltage and current to restrict energy entering the hazardous area to a safe level, providing cost-effective explosion protection for intrinsically safe circuits in process automation systems, compatible with various 4…20 mA intrinsically safe field instruments and DCS/PLC control systems.
| Parameter Name | Technical Specifications |
|---|---|
| General specifications | |
| Type | DC type, positive polarity |
| Electrical Data | |
| Rated resistance | 300 Ω |
| Series resistance | max. 327 Ω |
| Fuse rating | 50 mA |
| Hazardous area wiring | |
| Connection | Terminals 1, 2 |
| Safe area wiring | |
| Connection | Terminals 7, 8 |
| Supply circuit | max. 26.9 V |
| Measurement circuit | Max. 26.5 V at 10 µA |
| Conformity | |
| Degree of protection | IEC 60529 |
| Ambient Conditions | |
| Ambient Temperature | −20 … 60 °C (−4 … 140 °F) |
| Storage Temperature | −25 … 70 °C (−13 … 158 °F) |
| Relative Humidity | Max. 75 %, non-condensing |
| Mechanical parameters | |
| Degree of protection | IP20 |
| Connection | Screw terminals |
| Core cross-section | max. 2 x 2.5 … mm2 |
| Weight | Approx. 150 g |
| Dimensions | 12.5 x 115 x 116 mm (0.5 x 4.5 x 4.6 inch) (W x H x D) |
| Design | modular terminal housing, see system description |
| Installation Method | Mounts on 35 mm DIN mounting rail in accordance with EN 60715:2001 |
| Hazardous area application data | |
| EU Type Examination Certificate | BAS 01 ATEX 7005 |
| Marking | II (1)GD, I (M1) [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I |
| Voltage | 28 V |
| Current | 93 mA |
| Power | 650 mW |
| Maximum safety voltage | 250 V |
| Series resistance | min. 301 Ω |
| Certificate | TÜV 99 ATEX 1484 X |
| Marking | II 3G Ex nA IIC T4 Gc |
| Directive 2014/34/EU | EN IEC 60079-0:2018+AC:2020, EN IEC 60079-11:2024, EN IEC 60079-7:2015+A1:2018 |
| International approvals | |
| Control drawing | 116-0118 |
| Control drawing | 116-0139 (cULus) |
| IECEx certificate | IECEx BAS 09.0142, IECEx BAS 17.0091X |
| IECEx marking | [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I, Ex ec IIC T4 Gc |
| General information | |
| Supplementary information | Observe the certificates, declarations of conformity, instruction manuals and manuals within the applicable scope. For related information, see www.pepperl-fuchs.com. |
- 1 channel
- DC type, positive polarity
- Operating voltage 26.5 V @ 10 µA
- series resistance max. 327 Ω
- Fuse rating 50 mA
- DIN rail mountable
Petrochemical Plant
Intrinsically safe circuit energy limitation protection for hazardous areas
Power Energy System
Intrinsically safe 4…20 mA signal isolation
Process Automation
Interface protection between control room and intrinsically safe field instruments
Need selection advice or bulk quotation?
Send us the working condition parameters (signal type, medium, range, pressure, temperature, connection method), and our engineers will provide a selection scheme and quotation within 1 working day.
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