Omron G9KA-1A1B-E DC24 BY OMZ PCB Power Relay 24 VDC 300 A

High-current DC switching in a compact PCB-mount package is a challenge: traditional relays struggle with heat, contact wear, and limited current capacity. The Omron G9KA-1A1B-E DC24 BY OMZ addresses this with a dual-contact design that handles 300 A on the NO contact and 100 A on the NC contact at up to 400 VDC, making it suitable for solar inverters, battery systems, and industrial DC loads.

Who is it for

Engineers and integrators working on DC power distribution, renewable energy systems, or electric vehicle charging infrastructure who need a reliable, high-current switching solution on a PCB.

Main features

• 1 Form A (NO) + 1 Form B (NC) contact configuration for flexible switching
• NO contact rated 300 A at 400 VDC resistive load
• NC contact rated 100 A at 400 VDC resistive load
• 24 VDC coil with 160 Ω resistance
• Silver tin oxide (AgSnO2) contacts for durability
• Operate and release times max 50 ms
• Wide operating temperature range: -40 to +85 °C

Specifications

• Relay type: DC Power Relay
• Series: G9KA
• Mounting type: PCB Through Hole
• Coil voltage: 24 VDC
• Contact configuration: 1 Form A (NO) + 1 Form B (NC)
• NO contact rated current: 300 A at 400 VDC resistive
• NC contact rated current: 100 A at 400 VDC resistive
• Max switching voltage: 400 VDC
• Contact material: AgSnO2
• Coil resistance: 160 Ω at 23°C
• Operate time: Max 50 ms
• Release time: Max 50 ms
• Dielectric strength (coil-contacts): 2500 VAC for 1 min
• Dielectric strength (open contacts): 1000 VAC for 1 min
• Mechanical life: 100,000 operations min.
• Electrical life: 10,000 operations min. at rated load
• Operating temperature range: -40 to +85 °C
• Insulation resistance: 100 MΩ min. at 500 VDC

Tips

Ensure proper PCB trace sizing and thermal management when carrying high currents. The relay's AgSnO2 contacts provide good arc resistance, but consider snubber circuits for inductive loads to extend contact life.