Omron G3NB-240B-1 DC5-24V Solid State Relay 40A Compact
SKU: G3NB-240B-1 DC5-24VUSD 8.50
Omron G3NB-240B-1 DC5-24V is a compact 40A solid state relay with DC5-24V control for high-power AC load switching.
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Product Overview
The G3NB-240B-1 DC5-24V supports repetitive switching of substantial AC loads in process and machine applications. It replaces contact-based relays where cycle count, noise, and maintenance are critical concerns.
40A-Class Load Capability
This SSR class is suitable for higher-current thermal and resistive circuits, provided thermal design and mounting guidelines are followed.
Wide DC Input Control Compatibility
DC5-24V control input enables direct driving from common automation outputs, reducing interface complexity in panel design.
Lifecycle and Uptime Advantages
Solid-state operation eliminates contact wear and bounce, helping maintain consistent switching performance in demanding duty cycles.
Key Features
- Load Current: 40A
- Load Voltage: AC200-240V
- Control Input: DC5-24V
- Switching Method: Zero-cross
- Mounting: Panel mount
- Heat Sink: Required (substantial)
- SKU: G3NB-240B-1 DC5-24V
- Series: G3NB
- Voltage: 240V
- I/O: 5 I/O
Best-Fit Applications
- Switches higher-current loads repeatedly
- Interfaces directly with common DC control outputs
- Reduces acoustic and electrical noise from contact switching
- Improves long-term maintenance profile
- Supports stable process heating control
- Helps standardize SSR-based panel architecture
Buying Checklist
- 40A-class capability for heavier AC loads
- DC5-24V input for broad controller compatibility
- Durable high-cycle solid-state operation
- Good fit for thermal process equipment
- Established Omron SSR platform
Technical Specifications
| Model | G3NB-240B-1 DC5-24V |
|---|---|
| Series | G3NB |
| Type | Compact Solid State Relay |
| Load Current | 40A |
| Load Voltage | AC200-240V |
| Control Input | DC5-24V |
| Switching Method | Zero-cross |
| Mounting | Panel mount |
| Heat Sink | Required (substantial) |
| Operating Temperature | -30 to +80°C |
| LED Indicator | Input ON indicator |
Resources & Downloads
FAQ for G3NB-240B-1 DC5-24V
What heat sink do I need for 40A?
Substantial heat sink required. Power dissipation: 1.6V × 40A = 64W. Consider forced air cooling for high ambient temperatures. Calculate heat sink thermal resistance for your application.
Can I parallel SSRs for higher current?
Not recommended. SSRs don't share current evenly due to voltage drop variations. Use single higher-rated SSR or mechanical contactor for higher currents.
What wire size for 40A?
Use minimum 8 AWG (10mm²) copper wire for 40A. For runs over 3 meters or high ambient, use 6 AWG (16mm²). Follow local electrical codes.
Can this switch three-phase loads?
No, this is single-phase SSR. For three-phase loads, use three single-phase SSRs (one per phase) or dedicated three-phase SSR (G3PE-5 series).
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