Wago 857-400 Isolation Amplifier

USD 200.02

Configurable analog signal isolator with 24 VDC supply, 2500 V isolation, 6 mm housing, and voltage/current I/O.

SKU Wago-857-400 Category
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Wago 857-400 Isolation Amplifier

Model Identifier 857-400
Official Part Number 857-400
GTIN Standard 4045454471293

Technical Overview

DIN-rail isolation amplifier with configurable current/voltage input and output, 24 VDC supply, push-in CAGE CLAMP connection, and 2500 V isolation. The module is designed for signal separation and conditioning in industrial analog loops, with DIP-switch configuration and zero/span adjustment. Official WAGO documentation lists hazardous-location approvals and a compact 6 mm housing for high-density panel builds.

Key Features

  • Current and voltage input signal types
  • Current and voltage output signal types
  • DIP-switch configurable
  • Zero/span adjustment
  • 24 VDC supply voltage
  • 2500 V isolation
  • 6 mm module width
  • Push-in CAGE CLAMP connection technology
  • DIN-35 rail mounting
  • Hazardous-location approvals listed in manufacturer documentation

Configurable current/voltage signal conditioning with 2500 V isolation in a 6 mm DIN-rail module.

Technical Specification Matrix

ParameterValue
Input signal voltage range0…5 V; 1…5 V; 0…10 V; 2…10 V (calibrated switching)
Input signal current range0…20 mA; 4…20 mA (calibrated switching)
Input resistance (current input)≤ 50 Ω
Input resistance (voltage input)≥ 100 kΩ
Max. input current50 mA
Max. input voltage30 V
Zero/span adjustment± 3% of upper-range value
Output range0…20 mA, 0…10 V (configurable)
Supply voltage24 VDC
Isolation2500 V
Connection technologyPush-in CAGE CLAMP®
Mounting typeDIN-35 rail
Operating temperature-25…70 °C
Storage temperature-40…85 °C
Width6 mm
Height from upper-edge of DIN-35 rail97.8 mm
Depth94 mm
Weight36.8 g
GTIN4045454471293
Country of originDE
Product group6 (Interface Electronics)
Approval referencesIECEx, ATEX, UL hazardous location approvals listed in manufacturer documentation

Industrial Applications

1. PLC analog input isolation for process skids

Use as an interface between field transmitters and PLC analog cards when 0/4–20 mA or 0/1–10 V signals must be isolated and converted without adding panel bulk.

Problem Solved

Breaks ground loops and conditions mixed analog standards in compact control panels.

analog signal isolation0-20 mA4-20 mA0-10 V24 VDCDIN rail2500 V isolation

2. High-density retrofit of legacy instrument loops

Ideal where older voltage-based instrumentation must be standardized into current loops, or current loops must be converted back to voltage for modern controllers.

Problem Solved

Allows mixed legacy and modern signal standards to coexist in the same cabinet with minimal width.

signal conversioncurrent to voltagevoltage to current6 mm modulezero/span adjustmentDIP switch

3. Hazardous-area signal interface at the panel boundary

Suitable for signal demarcation between field equipment and safe-area PLC I/O when isolation and documented hazardous-location approvals are required.

Problem Solved

Provides galvanic separation and compact panel packaging for safety-critical analog interfacing.

galvanic isolationhazardous locationIECExATEXULsignal conditioner
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