Description
Here’s a complete Pros and Cons Q&A for the Omron G7L-2A-BUBJ-CB General Purpose Relay — a heavy-duty AC relay with 24 VAC coil, DPST-NO contacts, test button, Class B insulation, screw terminals, and upper bracket mounting.
✅ Pros
1. Heavy-Duty Power Switching
- Handles high inrush and load currents — suitable for industrial, HVAC, lighting, and power control applications.
- Rated for 71 mA coil current at 24 VAC, ideal for control circuits with standard AC outputs.
2. Double Pole, Single Throw Normally Open (DPST-NO) Contacts
- Allows two independent circuits to be switched simultaneously with one relay.
- Great for split-phase loads, dual-channel control, or added isolation.
3. Built-In Test Button
- Manual test/operate button allows for quick field testing without powering the coil.
- Ideal for maintenance, diagnostics, and system commissioning.
4. Screw Terminals for Secure Wiring
- Easy to install and service with standard screw terminals — robust and vibration-resistant.
5. Bracket Mounting for Panel Use
- Upper bracket mount simplifies installation into control panels or enclosures.
- Offers solid mechanical stability.
6. Class B Coil Insulation
- Provides 130°C thermal resistance, suitable for use in warm industrial environments.
7. Reliable Omron Engineering
- Omron relays are known for long mechanical life, high-quality contacts, and excellent arc suppression.
❌ Cons
1. No Integrated Status Indicator
- Lacks LED or visual indicator to show when the relay is energized — requires external feedback or testing.
2. AC Coil Only
- Coil rated for 24 VAC only — not suitable for DC-powered systems without conversion.
3. Large Size
- The G7L series is relatively bulky, so not suitable for compact installations or space-limited panels.
4. No Socket Option
- Direct panel mounting only — no DIN rail socket available for tool-free replacement.
5. Mechanical Wear Over Time
- Like all electromechanical relays, subject to contact wear in high-cycle applications — not ideal for very high switching frequency.
❓ Q&A
Q: What does the “DPST-NO” configuration mean?
A: It means the relay has two independent normally open contacts that close simultaneously when the coil is energized — useful for switching two loads together.
Q: Can I use this with a 24 VDC coil supply?
A: No. This version is rated for 24 VAC coil voltage only — DC versions are available separately in the G7L series.
Q: What is the function of the test button?
A: It allows manual activation of the relay for testing or setup without applying power to the coil.
Q: Is this relay socket-compatible?
A: No. This model is designed for panel/bracket mounting, not socket installation. Wiring is done via screw terminals.
Q: What’s the insulation class?
A: Class B — which means it can operate in environments up to 130°C insulation rating, offering good thermal protection.
Q: Is it suitable for switching motors or resistive loads?
A: Yes. It’s well-suited for motor starters, resistive heaters, and power distribution, within its rated current and voltage.
🧾 Summary
| Feature | Rating | Notes |
|---|---|---|
| Load Switching Capacity | ★★★★★ | High inrush and load capacity for power circuits |
| Ease of Installation | ★★★★☆ | Screw terminals and bracket mount |
| Test Functionality | ★★★★★ | Built-in manual test button |
| Size/Footprint | ★★☆☆☆ | Bulky compared to compact or PCB relays |
| Coil Voltage Flexibility | ★★☆☆☆ | 24 VAC only — no DC support in this model |
| Application Range | ★★★★☆ | Great for power control, less so for fast switching |
The Omron G7L-2A-BUBJ-CB is a reliable, industrial-grade power relay ideal for manual testing, high-power AC switching, and dual-load control, especially in HVAC panels, machinery, and power distribution systems.
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