SENSORS Returning to relays
If these sensors are the ‘eyes and ears’ of a building automation system, it also needs ‘hands’ to act in response. It needs control over outputs: heaters, lights, fans and other elements. Relays are still a great solution. They have one or more relay contact outputs, which can be supplied with a changeover output for interlock or scanning circuits. In addition, they can individually switch AC or DC voltages and simultaneously meet insulation or glow wire test requirements.
Because loads vary enormously and the latest technologies place new demands on relays, these devices need to address a range of different requirements. Specific applications have their own challenges. For example, LED lighting, water pumps and capacitive input filters with Power Factor Correction produce high inrush currents. This puts extreme loads on relay contacts. With this in mind, Omron’s G5RL relay family (Figure 3) is dedicated to lighting control. The new G5RL-K-EL latching type is approved IEC60669-1 16A 140µF and it is ideal for controlling fluorescent and LED lamps. Thanks to its innovative structure at single contact, it features the best ratio cost performance ratio in the market.
Omron’s G5RL family is also available in a monostable version with the G5RL-HR TV-8 approved that can switch up to 16A and is
Figure 2: Omron B5W-LB LCR can be set to trigger on the presence of an object within a target area
capable of dealing with high inrush currents of up to 150A. A latching version with the same TV-8 approval is also available with the models G5RL-U and G5RL-K. For smaller loads Omron offers the compact 10A G5Q family. Type G5Q-1A-EL2 was developed for capacitive inrush currents in the µs range. Such relays can switch inrush currents of 40A/100µs and nominal cut-off currents of 1A/250V AC up to 100,000 times, making them ideal for lamp loads.
After a year of lockdowns and health warnings, it’s natural that many employees will feel anxious or apprehensive about returning to shared workspaces. However, these small electronic components could make a big impact in helping workers feel safer and more comfortable in their offices after COVID.
Omron
components.omron.eu
Figure 3: The G5RL relay family dedicated to lighting control JUNE 2021 | ELECTRONICS TODAY 29
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