Omron G3NB-225B-1 Solid State Relay 25A Compact
SKU: G3NB-225B-1USD 8.00
Omron G3NB-225B-1 is a compact 25A solid state relay for medium-power AC load switching in space-constrained panels.
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Product Overview
The G3NB-225B-1 provides reliable semiconductor switching in process and machine control systems where frequent switching and long service life are required. It is commonly used in thermal and resistive load applications.
25A-Class Load Handling
Designed for mid-range AC load currents, this SSR supports repetitive switching duties with reduced wear compared to contact relays.
Improved Process Stability
Zero-cross switching behavior helps smooth load activation and can reduce electrical noise in control cabinets containing sensitive instrumentation.
Practical Integration
The relay form factor and control input compatibility support straightforward adoption in existing control architectures.
Key Features
- Load Current: 25A
- Load Voltage: AC200-240V
- Control Input: DC5-24V
- Switching Method: Zero-cross
- Mounting: Panel mount
- Heat Sink: Required
- SKU: G3NB-225B-1
- Series: G3NB
- Voltage: 240V
- I/O: 5 I/O
Best-Fit Applications
- Supports repetitive load cycling without contact wear
- Helps maintain stable thermal response
- Enables quieter panel operation than mechanical relays
Buying Checklist
- 25A-class switching capacity for mid-power loads
- Zero-cross operation for cleaner switching events
- Long-life solid-state operation
- Suitable for process control panel standards
Technical Specifications
| Model | G3NB-225B-1 |
|---|---|
| Series | G3NB |
| Type | Compact Solid State Relay |
| Load Current | 25A |
| Load Voltage | AC200-240V |
| Control Input | DC5-24V |
| Switching Method | Zero-cross |
| Mounting | Panel mount |
| Heat Sink | Required |
| Operating Temperature | -30 to +80°C |
| LED Indicator | Input ON indicator |
Resources & Downloads
FAQ for G3NB-225B-1
What heat sink do I need?
For 25A load, use substantial heat sink. Calculate power dissipation: 1.6V × 25A = 40W. Ensure heat sink can dissipate 40W at your ambient temperature.
Can I use this for motor control?
Yes, for motors under 25A full-load current. Add varistor across output for inductive load protection. Consider motor inrush current (6× FLC) during start.
What's the advantage of compact SSR?
Smaller than traditional SSRs, saves panel space. Cost-effective for medium-power applications. Zero-cross switching reduces EMI.
Do I need external fuse?
Yes, external fuse recommended for branch circuit protection. Size at 125-150% of load current. SSR has internal protection but external fuse provides disconnect capability.
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