Wago 857-420 Data Sheet

Data sheet | Item number:857-420

Isolation amplifier; Current input signal; Current and voltage output signal;
Supply voltage: 24 VDC; 6 mm module width

857-420

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Data sheet | Item number:857-420

Item description

Short description:

The Repeater Power Supply links 2- or 3-wire transmitters located in the field. It provides the power required and transmits the analog signals in an
electrically isolated way.

Features:

Power supply to SMART transmitters

Switching between measuring ranges is calibrated

Safe 3-way isolation with 2.5 kV test voltage per EN 61140

Data

Technical Data

Configuration

Configuration options DIP switches

Input

Input signal type Current

Input signal, current 0 … 20mA;4 … 20mA (calibrated configurable signals)

Input resistance (intput/current) ≤50Ω

Sensor supply U = 18 V; 30 mA

v

Max. input current 50 mA

Output

Output signal type Current

Voltage

Output signal voltage 0 … 5 V; 1 … 5 V; 0 … 10 V; 2 … 10 V (calibrated switchable)

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Data sheet | Item number:857-420

Output signal current 0 … 20 mA; 4 … 20 mA (calibrated switchable)

Load impedance (output/voltage) ≥2kΩ

Load impedance (output/current) ≤600Ω

Offset ≤20µA

Residual ripple ≤10mV (rms)

Signal processing

Max. operating frequency 100Hz

Step response typ. 3.5ms

Measurement error

Transmission error typ. ≤ 0.1 % of upper range value

Temperature coefficient ≤ 0.01 %/K

Power supply

Type of power supply 24 VDC

Nominal supply voltage U

S

DC24V

Supply voltage range ±30%

Current consumption at supply voltage ≤45mA

Safety and protection:

Test voltage (input/output/supply) AC 2.5kV;50Hz;1min

Protection class IP20

Connection data

Connection technology

Push-in CAGE CLAMP

®

Solid conductor 0.08 … 2.5mm²/ 28 … 14AWG

Fine-stranded conductor 0.34 … 2.5mm²/ 22 … 14AWG

Strip length 9 … 10mm/ 0.35 … 0.39inch

Geometrical Data

Width 6mm/ 0.236inch

Height from upper-edge of DIN-35 rail 97.8mm/ 3.85inch

Depth 94mm/ 3.701inch

Mechanical data

Type of mounting DIN-35 rail

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Data sheet | Item number:857-420

Material Data

Color light gray

Fire load 0 MJ

Weight 37 g

Environmental Requirements

Surrounding air (operating) temperature -25 … 70°C

Surrounding air (storage) temperature -40 … 85°C

Standards and specifications

Conformity marking 1

Commercial data

Product Group 6 (Interface Electronics)

Country of origin DE

GTIN 4045454471330

Customs Tariff No. 85437090300

Approvals / Certificates

UL-Approvals

Logo Approval Additional Approval Text

Certificate
name

UL

UL International Netherlands B.V. (ORDINARY
LOCATIONS)

UL 508 E175199

Sec.4

Compatible products

power supply

Item no.: 787-2852
Switched-mode power supply; for JUMPFLEX® Signal Conditioners; 1-phase; 24 VDC output voltage; 1
A output current

787-2852

transfer module

Item no.: 857-980

Interface adapter; 16-pole; analog

857-980

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