RMC1H Series Solid State Relay vs RY1H4/8-G5NB Signal Module – Choosing the Right Control Solution
Product Overview
RMC1H Solid State Relay Series (2, 4, or 8 Channels)
The RMC1H series represents RY-ELE's latest generation of solid state relay modules, offering a maintenance-free, high-speed, and silent switching solution.
It is available in 2-channel, 4-channel, and 8-channel configurations, and two control types:
- DD Type: DC control to DC load
- DA Type: DC control to AC load
Key Features:
- Channel options: 2 / 4 / 8
- Control voltage: 3–28VDC
- Load capacity: 3A per channel 250VAC / 30VDC
- Ultra-fast switching response (<1ms)
- No mechanical wear – extended service life
- Compact width of 32mm for high-density installation
- DIN35 rail mounting with protective cover for safety
- Wide operating temperature: –40°C to +80°C
This model's non-contact semiconductor design ensures long operational life, making it ideal for continuous and high-speed switching applications.
RY1H4/8-G5NB Signal Relay Module
The RY1H4/8-G5NB series integrates Omron G5NB-1A-E mechanical relays on a modular I/O interface board. It provides 4-channel and 8-channel options, designed for general-purpose control and easy maintenance.
Key Features:
- Channel options: 4 / 8
- Coil voltage: 24VDC
- Load capacity: 5A per channel 250VAC / 30VDC
- Replaceable plug-in relays for easy maintenance
- LED indicators for real-time status
- DIN-rail mounting, screw terminal wiring
- Equipped with anti-shock protective cover
- CE and RoHS compliant
This series focuses on modularity, flexibility, and compatibility with PLC systems, offering an economical and serviceable solution for control cabinets.
Technical Comparison
| Feature | RMC1H (DD/DA Type) | RY1H4/8-G5NB |
|---|---|---|
| Switching Technology | Semiconductor (SSR) | Electromechanical Relay |
| Control Voltage | 3–28VDC | 24VDC |
| Load Type | DC (DD) / AC (DA) | AC/DC |
| Load Capacity | 3A per channel | 5A per channel |
| Response Time | <1ms | Mechanical (slower) |
| Operation Noise | Silent | Audible click |
| Channel Options | 2 / 4 / 8 | 4 / 8 |
| Maintenance | Maintenance-free | Relays replaceable |
| Service Life | Very long (no contacts) | ~100,000 electrical cycles |
| Application Focus | High-speed, silent, long-life | General signal and PLC control |
Application Scenarios
1. High-Speed, Silent Switching – RMC1H Solid State Relay (DD/DA)
Example: Automated test benches, robotic control systems, or precision packaging lines.
Pain Point Solved: In high-frequency or long-duration switching, mechanical relays suffer from contact wear and noise. The RMC1H-DD/DA solves this with contactless semiconductor switching, delivering silent operation, ultra-fast response, and long life — ideal for modern automation requiring speed and stability.
2. General Control and PLC Signal Output – RY1H4/8-G5NB Module
Example: Control cabinets in HVAC, conveyors, or lighting systems.
Pain Point Solved: Engineers often need visual operation feedback and easy maintenance. The RY1H4/8-G5NB, with LED indication and plug-in relay sockets, allows quick replacement and reduces downtime. Its 5A capacity supports a wide range of loads with reliable mechanical switching.
Why the RMC1H Series Marks a New Step in Technology
The RMC1H series is not just an upgrade — it's a technological evolution in relay design.
- Semiconductor architecture eliminates contact arcing, extending service life.
- Multi-channel integration (2/4/8) allows greater control density in compact cabinets.
- Two control options (DD / DA) support both DC and AC loads for broader applications.
- Temperature and vibration resilience ensures long-term stability even in harsh industrial environments.
With these improvements, the RMC1H solid state relay series offers engineers a high-performance alternative to traditional mechanical relay modules.
Conclusion
Both RY-ELE products are engineered for control excellence, but serve different operational needs:
- Choose RMC1H-DD/DA when your system requires fast, silent, and maintenance-free switching for DC or AC loads.
- Choose RY1H4/8-G5NB when you need a cost-effective, replaceable relay interface with visual indication and strong load capacity.
Whichever solution you choose, RY-ELE delivers certified quality, compact design, and proven reliability for automation control worldwide.
Discover more at the RY-ELE Official Website.
