Name: Wago 859-794 Optocoupler module - INOSAKI
SKU: Wago-859-794
Price: 42.47 USD
Availability: InStock

Technical Overview

24VDC optocoupler terminal block for DIN-rail mounting, offering galvanic isolation up to 2.5 kVrms for signal conditioning.

Key Features

5-conductor DIN-rail mountable design.
CAGE CLAMP® connection technology for secure wiring.
Red LED status indicator for clear operational feedback.
Specifically designed for robust railway applications.
Wide operating temperature range from -40 °C to 70 °C.
Fast switching times: 20 µs turn-on and 120 µs drop-out.
Low leakage current of 25 µA at nominal voltage.
Module width of 6 mm for space-efficient integration.

Technical Specification Matrix

Parameter	Value
Nominal Input Voltage U_N	DC 24 V
Input Voltage Range (Low Level)	DC 0 – 5 V
Input Voltage Range (High Level)	DC 16 – 30 V
Nominal Input Current at U_N	4.2 mA
Output Voltage Range	DC 9 – 60 V
Limiting Continuous Current	0.1 A
Max. Voltage Drop at Output	DC 2 V
Leakage Current at Nominal Voltage	25 µA
Turn-on Time	20 µs
Drop-out Time	120 µs
Switching Frequency	1.5 kHz
Dielectric Strength (Control/Load circuit, AC, 1 min)	2.5 kVrms
Connection Technology	CAGE CLAMP®
Solid Conductor Size	0.08 – 2.5 mm² / 28 – 14 AWG
Fine-stranded Conductor Size	0.08 – 2.5 mm² / 28 – 14 AWG
Strip Length	5 – 6 mm / 0.2 – 0.24 inch
Operating Temperature	-40 – 70 °C
Storage Temperature	-40 – 70 °C
Processing Temperature	-25 – 50 °C
Color	Gray
No. of Positions	5 Ways
No. of Levels	2
Mounting Type	DIN-35 rail
Status Indication	LED Red
Physical Weight (kg)	0.02
Dimensions L x W x H (cm)	9.1 x 0.6 x 5.6

Industrial Applications

1. Industrial Process Control with PLC/DCS

This optocoupler module is ideal for interfacing 24VDC PLC/DCS outputs with higher or different voltage DC loads in industrial automation systems, safeguarding sensitive control electronics from load-side disturbances.

Problem Solved

Provides robust galvanic isolation (2.5 kVrms) between control circuits and field devices, effectively preventing ground loops, transient voltage spikes, and electrical noise from damaging control equipment. Its fast switching response (20µs turn-on) ensures responsive control operations.

PLC interfacinggalvanic isolationtransient protectionsignal conditioningDC load control2.5 kVrms dielectric strength24 VDC input9-60 VDC output

2. Railway Signaling and Onboard Control Systems

Given its explicit design for 'railway applications', this optocoupler serves as a reliable and robust interface in railway signaling or onboard train control systems for isolated switching of critical low-power DC loads.

Problem Solved

Ensures high reliability and safety in demanding railway environments (operating temperature -40 to 70°C) by electrically isolating control logic from external DC loads. This mitigates interference and prevents failures caused by voltage spikes or ground potential differences inherent in railway electrical systems, upholding crucial safety standards.

Railway signalingonboard controlelectrical isolationharsh environment-40 to 70°CDC switching2.5 kVrmsDIN-rail mounting

3. Sensor/Actuator Isolation in Machine Building

In complex machinery, the WAGO 859-794 module can provide essential isolation between the control circuit and various DC sensors or low-power actuators, ensuring signal integrity in electrically noisy environments.

Problem Solved

Protects sophisticated control electronics from electrical noise and voltage fluctuations originating from field sensors or actuators, thereby maintaining clean signal transmission and preventing cascading system failures. The CAGE CLAMP® connections ensure reliable wiring even in machinery subject to vibrations.

Sensor isolationactuator interfacenoise suppressionsignal integrityCAGE CLAMPDC controlmachine safety24 VDC