vol.288 January 2025
Improved "heat suppression" and "heat dissipation" solve heat problems caused by high capacity.
With the trend towards multifunctionality and high functionality, there is a growing demand for high-capacity support in various types of equipment. However, heat generation issues become more prominent as the capacity becomes higher. A relay generating a large amount of heat can interfere with the functionality of the equipment. Therefore, it is essential to take measures to prevent the relay from generating heat. However, taking countermeasures against heat generation can increase the size of the relay and require additional parts. OMRON contributes to the realization of safety and security with relays that suppress and dissipate heat for higher capacities.
OMRON's relays solve heat problems by adopting heat suppression and dissipation technologies.
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If a relay generates a large amount of heat ▶ |
The improvement of heat suppression and dissipation performance is essential,otherwise it can lead to equipment deterioration and malfunction. 
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Heat suppression
Suppresses resistance of the current-carrying part
Heat suppression by increasing cross-sectional area
Increased cross-sectional area of the current-carrying part
(terminal part)
G6QE
1.2 mm2 × 2 (0.8 × 1.5 mm)
480 VAC, 36 A
Load switching
G6QG
2.4 mm2 × 2 (0.8 × 3.0 mm)
480 VAC, 55 A
Load switching
Supports even larger currents
G9KA
45 mm2 × 2 (3.0 × 15.0 mm)
800 VAC, 260 A
Power interruption
G9KA-E
72 mm2 × 2 (3.0 × 24.0 mm)
1000 VAC, 300 A
Power interruption
Heat suppression
Suppresses resistance of the current-carrying part
Heat suppression by dispersing current
Parallelized contacts to disperse heat without concentrating it
Heat suppression by improving materials and shape
Optimized contact material and shape to reduce contact resistance
Heat dissipation
Ensures proper ventilation
Heat dissipation by improving ventilation
Improved heat dissipation by adopting a structure that ensures ventilation and by increasing the contact area between each terminal and the air
G9KA
The G9KA-E with a larger standoff structure allows for even greater ventilation
OMRON's power relays, born from the approach of “heat suppression” and “heat dissipation” improvement
Switchable 480 VAC, 40 A
Low initial contact resistance of 6 mΩ or less
4-pole power relay
G9KC
1-pole 480 VAC, 55 A
Load switchable
Compact, low-profile power relay
G6QG
800 V 260 A / 1000 V 300 A cutoff and ultra-low contact resistance of 0.2 mΩ (initial) or less
High-capacity power relay
Click here for more information
G9KA
G9KA-E
The use of heavy copper PCBs further improves heat suppression and dissipation.
Thicker copper foil facilitates current flow, suppresses heat generation, and dissipates heat.
* Contents as of December 2024.
In the interest of product improvement, specifications are subject to change without notice
