WAGO 788-721 Solid-State Relay Module

USD 93.57

Total:

Compact 24V AC/DC input solid-state relay module with 24-230VAC/4A zero-cross output, designed for DIN rail mounting.

SKU Wago-788-721 Category
MOQ: 15 pcs   >>   Order in multiples of 15
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WAGO 788-721 Solid-State Relay Module

Model Identifier 788-721
Official Part Number 788-721
GTIN Standard 4045454945961

Technical Overview

Compact 24V AC/DC input solid-state relay module with 24-230VAC/4A zero-cross output, designed for DIN rail mounting.

Key Features

  • Nominal Input Voltage: 24 V AC/DC
  • Output Voltage Range: 24 … 230 VAC
  • Limiting Continuous Output Current: 4 A
  • 2-Wire Connection
  • Zero-Cross Switching
  • Red Status Indicator
  • Module Width: 15 mm
  • Mounting Type: 35 mm DIN Rail
  • IP Rating: IP20 Enclosure
  • Connection Type: Push-In
  • Operating Temperature Range: -25 to 50 °C

Zero-cross switching minimizes electrical noise and extends the service life of both the relay and the connected AC loads.

Technical Specification Matrix

ParameterValue
Nominal Input Voltage24 V AC/DC
Output Voltage Range24 … 230 VAC
Limiting Continuous Output Current4 A
Switching TypeZero-Cross Switching
IndicatorRed Status Indicator
Module Width15 mm
Mounting Type35 mm DIN Rail
IP RatingIP20
Operating Temperature Range-25 to 50 °C
Connection TechnologyPush-In
Physical Weight (kg)0.05
Dimensions L x W x H (cm)6.4 x 1.5 x 8.6

Industrial Applications

1. Industrial Lighting Control in Automation Systems

This solid-state relay can precisely switch 24-230VAC lighting circuits up to 4A in industrial automation systems, responding to 24V AC/DC control signals from PLCs or other controllers. Its zero-cross switching minimizes electrical noise, making it ideal for environments requiring low electromagnetic interference.

Problem Solved

Provides reliable, silent, and fast switching of AC lighting loads in environments where frequent switching or minimal electromagnetic interference is crucial, without the wear and tear of mechanical relays.

PLC controlAC lightingzero-cross switchingindustrial automation24V control230VAC load4A current

2. Small Motor/Valve Actuator Control in Process Skids

The WAGO 788-721 is suitable for controlling small AC motors (e.g., fractional HP pumps) or solenoid valves operating on 24-230VAC up to 4A, integrated into compact process skids or machinery. Its 15mm width saves valuable space in control panels.

Problem Solved

Enables robust, solid-state interfacing between low-voltage DC/AC control logic and higher voltage AC inductive loads. Its compact size and zero-cross switching help protect motor/valve windings from high inrush currents and fit into confined spaces.

Motor controlsolenoid valveprocess controlinductive load24V control230VAC4Acompact designDIN rail

3. HVAC System Component Switching

This solid-state relay can switch heating elements, small fans, or damper actuators in commercial and industrial HVAC systems, controlled by 24V AC/DC building automation systems. Its -25 to 50 °C operating temperature range ensures reliable performance in typical equipment room conditions.

Problem Solved

Offers long-life switching for frequently cycled HVAC components, reducing maintenance. The zero-cross switching minimizes electrical noise that could interfere with sensitive building management system electronics.

HVAC controlheating elementsfan controlbuilding automation24V AC/DC input230VAC output-25 to 50 °C
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