WAGO 788 Series Modules | 788-412 Relay Module

Technical Dossier

Product Details And Specifications

WAGO 788 Series: Comprehensive Module Range and Technical Overview

The WAGO 788 Series relay interface modules occupy a well-established position in global heavy industry automation infrastructure. Deployed across chemical processing plants, petroleum refineries, nuclear power facilities, and large-scale manufacturing lines, the 788 Series provides a standardized, DIN-rail-mounted relay interface layer between field instrumentation and PLC/DCS control systems. Its compact form factor, high packing density, and compatibility with WAGO's CAGE CLAMP® spring-pressure termination technology have made it a default specification in engineering standards across Europe, Asia-Pacific, and the Americas. The 788-412 specifically functions as a single-channel relay output module with a 24 VDC coil voltage, designed for switching AC/DC loads in control panel environments where signal isolation and contact reliability are non-negotiable.

The Evolution of WAGO 788 Series Architecture

The WAGO 788 Series was introduced as part of WAGO's relay interface module portfolio to address the need for compact, high-density relay switching in industrial control cabinets. Early iterations of the series focused on single-channel SPDT (Single Pole Double Throw) configurations with screw-type or CAGE CLAMP® termination, targeting 24 VDC coil voltages standard in PLC output circuits. As industrial automation evolved through the 1990s and 2000s, WAGO expanded the 788 range to include multi-channel variants, wider coil voltage options (12 VDC, 24 VAC, 115 VAC, 230 VAC), and enhanced contact ratings to support higher-current switching applications.

The series architecture is built around a plug-in relay socket base (compatible with standard 5 mm and 6 mm pitch relay modules), enabling field replacement of relay inserts without rewiring — a critical feature for maintenance teams operating under process uptime constraints. Later revisions introduced LED status indicators, mechanical actuators for manual relay forcing, and gold-plated contacts for low-level signal switching in instrumentation circuits. Compatibility with WAGO's 280 Series and 281 Series terminal blocks allows the 788 modules to integrate directly into existing WAGO wiring infrastructure without adapter components. As the broader industrial relay market has matured, the 788 Series has entered a stable/mature lifecycle phase; WAGO continues to supply the range, but engineering teams specifying new installations increasingly evaluate the 789 Series and WAGO's I/O system relay output modules as forward-compatible alternatives.

WAGO 788 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the WAGO 788 Series. Each entry includes a concise functional description for rapid identification during maintenance and procurement activities.

788-104: Single-channel relay module, 24 VDC coil, SPDT contact, 6 A rated, screw termination.
788-106: Single-channel relay module, 24 VDC coil, SPDT contact, 6 A rated, CAGE CLAMP® termination.
788-108: Single-channel relay module, 24 VDC coil, 2-pole changeover contact, 6 A rated.
788-112: Single-channel relay module, 12 VDC coil, SPDT contact, 6 A rated, CAGE CLAMP® termination.
788-114: Single-channel relay module, 24 VAC coil, SPDT contact, 6 A rated, CAGE CLAMP® termination.
788-116: Single-channel relay module, 115 VAC coil, SPDT contact, 6 A rated, CAGE CLAMP® termination.
788-118: Single-channel relay module, 230 VAC coil, SPDT contact, 6 A rated, CAGE CLAMP® termination.
788-302: Relay socket base, 5 mm pitch, for 788 Series plug-in relay inserts, DIN-rail mount.
788-304: Relay socket base with LED indicator and mechanical actuator, 5 mm pitch, DIN-rail mount.
788-306: Relay socket base with LED indicator, test button, and diode suppression, 5 mm pitch.
788-308: Relay socket base with LED indicator and varistor suppression, 5 mm pitch, DIN-rail mount.
788-402: Single-channel relay module, 24 VDC coil, SPDT contact, gold-plated contacts for low-level signal switching.
788-404: Single-channel relay module, 24 VDC coil, DPDT contact, 6 A rated, CAGE CLAMP® termination.
788-406: Single-channel relay module, 24 VDC coil, SPDT contact, 10 A rated, high-current switching variant.
788-408: Single-channel relay module, 24 VDC coil, SPDT contact, 16 A rated, heavy-duty contact version.
788-410: Single-channel relay module, 24 VDC coil, SPDT contact, 6 A rated, with integrated LED status indicator.
788-412: Single-channel relay module, 24 VDC coil, SPDT contact, 6 A rated, CAGE CLAMP® termination, standard industrial relay interface module — the primary SKU of this listing.
788-414: Single-channel relay module, 24 VDC coil, SPDT contact, 6 A rated, with mechanical actuator for manual relay forcing.
788-416: Single-channel relay module, 24 VDC coil, SPDT contact, 6 A rated, with diode freewheeling suppression integrated.

Sourcing Hard-to-Find & Obsolete WAGO 788 Series Parts

DriveKNMS maintains a dedicated inventory of WAGO 788 Series modules, including variants that have been discontinued from WAGO's standard production schedule. For process industries operating legacy control panels built to 788 Series specifications, replacing individual relay modules with non-original alternatives introduces contact rating mismatches, footprint incompatibilities, and documentation non-conformances that complicate regulatory compliance audits.

DriveKNMS sources 788 Series stock through authorized distribution channels and verified secondary market suppliers, with each unit subject to pre-shipment inspection. For plant maintenance teams managing multi-year turnaround cycles, DriveKNMS offers bulk reservation of 788 Series stock against scheduled maintenance windows, reducing the risk of last-minute procurement failures for low-volume, high-criticality components. Inquiries for specific sub-variants, date codes, or country-of-manufacture requirements are handled directly by the technical sales team.

Quality Control for the WAGO 788 Series Range

WAGO 788 Series relay modules are electromechanical components with defined contact life ratings (typically 10⁷ mechanical operations, 10⁵ electrical operations at rated load). DriveKNMS applies a structured inspection protocol to all 788 Series units prior to dispatch:

Coil continuity and resistance verification: Coil resistance is measured against WAGO's published nominal values (±10% tolerance) to confirm coil integrity and rule out open-circuit or shorted coil conditions.
Contact resistance measurement: Contact resistance is measured in the energized and de-energized states using a four-wire milliohm measurement method. Values exceeding 100 mΩ on new units or 200 mΩ on refurbished units are cause for rejection.
Pull-in and drop-out voltage testing: Coil pull-in voltage is verified to be ≤75% of rated coil voltage; drop-out voltage is verified to be ≥10% of rated coil voltage, per standard relay acceptance criteria.
Mechanical actuator function check: On units equipped with manual actuators (e.g., 788-414), the actuator mechanism is cycled to confirm positive engagement and release without binding.
Visual and dimensional inspection: Housing integrity, CAGE CLAMP® terminal condition, and relay insert seating are inspected under magnification. Units with cracked housings, deformed terminals, or evidence of thermal stress are quarantined.
Functional switching test: Each unit is cycled under a representative resistive load to confirm switching function prior to packaging.

For WAGO 788 Series availability, bulk pricing, or technical specification queries, contact DriveKNMS directly: