Wago 750-669/000-003 4FDI/4FRO

Why Choose the WAGO 750-669/000-003 PROFIsafe Digital Input and Relay Output Module?

The WAGO 750-669/000-003 is a fail-safe digital input and relay output module designed for safety-critical industrial automation within the WAGO I/O System 750. It provides four fail-safe digital inputs and four fail-safe relay outputs, allowing safety sensors and safety actuators to be integrated directly into PLC-based automation systems using the PROFIsafe safety protocol.

This module is particularly suited for applications requiring electrically isolated relay outputs capable of switching higher loads or mixed AC/DC voltages. The relay outputs can switch loads up to 48 VAC or 60 VDC with up to 6 A per channel, enabling direct control of safety contactors, valves and shutdown circuits. :contentReference

Each of the four digital inputs is clock-sensitive and monitored via dedicated test pulses. This ensures continuous detection of wiring faults such as short circuits, cross-circuits or unintended voltage supply conditions, providing reliable functional safety monitoring in demanding industrial environments. :contentReference

Key Advantages

• Combined fail-safe digital inputs and relay outputs in one module.
• Supports PROFIsafe communication for safety PLC integration.
• Relay outputs switch high loads up to 6 A per channel.
• Continuous monitoring for short circuits and cross-circuits.
• Electrically isolated outputs suitable for AC or DC loads.
• Designed for modular WAGO I/O System 750 control architectures.

Key Features

• 4 fail-safe digital inputs with clock-sensitive monitoring.
• 4 fail-safe relay outputs with electrical isolation.
• Load switching range: 5…60 V DC or 5…48 V AC.
• Output current up to 6 A per channel.
• Configurable safety parameters via WAGO engineering tools.
• PROFIsafe address configurable via DIP switch or software.
• Status LEDs for channel diagnostics and module status.
• DIN rail mounting for industrial automation panels.

Technical Specifications

• Manufacturer: WAGO
• Series: I/O System 750
• Model: 750-669/000-003
• Module type: Fail-safe digital input and relay output module
• Number of inputs: 4 fail-safe digital inputs
• Number of outputs: 4 fail-safe relay outputs
• Output type: Electrically isolated relay
• Load voltage: 5…60 V DC / 5…48 V AC
• Output current: up to 6 A per channel
• Total switching current: up to 24 A
• Input current (typ.): approx. 2.2 mA
• Maximum input frequency: 50 Hz
• Safety protocol: PROFIsafe (V1 and V2)
• Safety classification: up to SIL 3 / Category 4 / PL e
• System supply voltage: 5 V DC via system bus
• Field supply voltage: 24 V DC
• Connection technology: WAGO Push-in CAGE CLAMP® terminals
• Mounting: DIN-35 rail
• Operating temperature: 0 to 55 °C
• Dimensions: approx. 48 mm width
• Protection rating: IP20

Integrated Safety Monitoring and High-Power Switching

Safety automation systems require reliable monitoring of safety sensors and safe switching of actuators such as contactors or shutdown circuits. Relay-based safety outputs are particularly useful when switching higher loads or mixed voltage types.

The WAGO 750-669/000-003 combines fail-safe digital inputs with isolated relay outputs, enabling engineers to monitor safety signals while directly controlling high-power safety devices. This integrated design simplifies machine safety architecture while maintaining compliance with international safety standards. :contentReference

Typical Applications

• Emergency stop monitoring and machine shutdown systems.
• Safety door and guard monitoring circuits.
• Control of safety contactors and motor shutdown circuits.
• Machine safety interlock systems.
• Industrial automation safety networks.

Trusted by Automation Engineers

WAGO safety I/O modules are widely used in machine automation systems to implement reliable functional safety architectures compliant with international industrial safety standards.