Overview
The Pepperl Fuchs WE77/Ex-2 115VAC (part 129200) is a dual-channel switch amplifier designed to safely transmit digital signals into hazardous areas. This device interfaces with sensors conforming to EN 60947-5-6 (NAMUR) standards or mechanical contacts as transmitters, making it ideal for Zone 0/1 control applications. The unit is intrinsic-safety-certified (EEx ia IIC) and provides galvanic isolation between input and output circuits for enhanced reliability.
Key Features
- Two digital input channels for versatile application in various industrial settings
- Galvanic isolation between input and output circuits, preventing interference and enhancing signal integrity
- Relay contact output (change-over contact) on each channel for reliable signal transmission
- Lead-break monitoring ensures safety by detecting control circuit faults
- Compact DIN-rail housing with IP20 rating and status LEDs for power and channel activity
- ATEX/IECEx certified for hazardous-area compliance
Technical Specifications
- Input Supply Voltage: 103.5 to 126 V AC, 45 to 65 Hz
- Power Consumption: Approximately 3.2 VA
- Power Dissipation: 2.5 W
- Input Type: NAMUR sensors per EN 60947-5-6 or mechanical contacts
- Output Load Rating: 250 V AC @ 2 A / 500 VA, 40 V DC @ 2 A per channel
- Switching Delay: On ~10 ms / Off ~20 ms
- Switch Rate: < 10 Hz
- Number of Channels: 2
- Output Type: SPDT relay contacts (Form C)
- Certifications: ATEX/IECEx EEx ia IIC
- Enclosure: DIN-rail mounted, IP20
Typical Applications
The WE77/Ex-2 is designed for hazardous-area applications, interfacing NAMUR sensors and mechanical contacts to convert signals into isolated relay outputs—ideal for Zone 0/1 control systems. Common uses include process automation, explosion-proof signaling networks, and intrinsic-safety sensor interfaces in petrochemical, mining, and chemical processing industries.
Compatibility & Replacements
Compatible With
- NAMUR digital sensors (EN 60947-5-6 compliant)
- Mechanical contact switches and pushbuttons
- Industrial control systems requiring intrinsic-safety certification
- ATEX/IECEx Zone 0, Zone 1, and Zone 2 hazardous areas
- DIN-rail mounted control panels
Replaces / Drop-In Replacement For
- WE77/EX-2 115V (same part, alternate designation)
- Pepperl Fuchs 129200
Works With
- NAMUR-compliant sensor networks
- EX-certified intrinsic-safety control circuits
- Industrial relay logic and PLC input modules
- Process automation systems requiring galvanic isolation
