Pepperl+Fuchs WE77-EX1 Intrinsically Safe Switch Amplifier

Description:

The Pepperl+Fuchs WE77/Ex-1 115V Switch Amplifier is an intrinsically safe isolated barrier used in hazardous area signal isolation and industrial process automation systems. Commonly installed in chemical plants, oil and gas facilities, process control systems, and hazardous-area instrumentation requiring safe transfer of digital signals from NAMUR sensors or mechanical contacts. Maintenance teams, OEMs, and system integrators use this switch amplifier for equipment repairs, control system upgrades, and replacement of existing intrinsic safety barriers.

Applications:

The Pepperl+Fuchs WE77/Ex-1 115V is designed to provide intrinsically safe signal isolation in hazardous industrial environments. It is commonly used in chemical processing plants, refineries, pharmaceutical facilities, and process automation systems where NAMUR sensors, mechanical contacts, and hazardous-area instrumentation require galvanic isolation and reliable relay outputs for safe operation.

Technical Specifications:

• Manufacturer Part Number (MPN): WE77/Ex-1 115V
• Product Type: Switch Amplifier / Isolated Barrier
• Series: WE77 / WE-System
• Manufacturer: Pepperl+Fuchs
• Number of Channels: 1
• Input Type: NAMUR Sensor or Mechanical Contact
• Input Circuit: EEx ia IIC Intrinsically Safe
• Supply Voltage: 103.5 to 126 VAC
• Rated Frequency: 45 to 65 Hz
• Output Type: Relay with 1 Changeover Contact (SPDT)
• Contact Rating: 253 VAC / 2 A / 500 VA
• Open Circuit Voltage: Approximately 8 VDC
• Short Circuit Current: Approximately 8 mA
• Switching Frequency: Less than 10 Hz
• Lead Breakage Monitoring: Yes
• Operating Modes: Reversible / Non-Reversible
• Galvanic Isolation: Input to Output and Input to Power Supply
• Degree of Protection: IP20
• Mounting Type: DIN Rail Mount
• Dimensions (W × H × D): 40 × 104 × 110 mm
• Weight: Approximately 390 g
• Operating Temperature Range: -20°C to +60°C
• Certifications: ATEX, cULus, CE
• Standards: EN 60947-5-6, IEC/EN 61010-1, EN 60079-11
• Application Environment: Hazardous area process automation and intrinsic safety systems

Common Replacements:

• Pepperl+Fuchs KFA5-SR2-Ex1.W
• Pepperl+Fuchs WE77/Ex-2 115V
• Pepperl+Fuchs KFD2-SR2-Ex1.W