Unit Relay Card U-Relay-Card-In 8-channel input module 12 V DC

Unit Relay Card U-Relay-Card-In is an 8-channel input module designed for 12 V DC systems. The card receives up to eight independent control inputs and converts them into relay activation signals for integration with automation, security or remote switching circuits. The compact form factor and standard terminal connections allow straightforward installation in control panels or on DIN rails within 12 V installations, while providing electrical isolation between inputs and relay outputs to protect connected devices.

Advantages

The module provides eight separate input channels, reducing the need for multiple separate relays and saving panel space. Designed for 12 V DC operation, it is compatible with common low-voltage automotive, marine and low-voltage building systems. Clear terminal assignment and compact dimensions simplify wiring and mounting. Solid-state components and relay drivers ensure consistent response to control signals and reliable isolation between control and switched circuits.

Suitable for

• Control panels for automation and building management
• Security systems and alarm signaling interfaces
• Remote switching of loads in 12 V installations
• Automotive and marine control applications using 12 V DC

Key specifications

• Number of input channels: 8 independent channels
• Supply voltage: 12 V DC operation
• Input type: discrete control inputs compatible with 12 V signal levels
• Output: relay activation per input channel
• Mounting: compact card suitable for panel mounting or DIN-rail enclosure integration
• Connections: screw terminals for signal and supply wiring
• Isolation: electrical isolation between inputs and relay outputs

How to use

Connect the module to a stable 12 V DC supply and wire each control source to the corresponding input terminal according to the terminal markings. Verify polarity and common reference connections before applying power. Use screw terminals to secure signal and supply conductors and ensure proper torque to avoid loose connections. After wiring, apply control signals to the input channels to operate corresponding relays; test each channel individually to confirm correct wiring and response before placing the system into regular operation.

Recommendations

Use appropriate fusing on the 12 V supply and correct wire gauges for the expected load and wiring distances. Keep signal wiring separate from high-current supply runs to minimize interference. Verify compatibility of connected loads with the relay switching characteristics and maintain the module in a dry, vibration-limited environment to ensure long-term reliability.