HWASEONG, South Korea, July 8 Reuters Samsung Electronics workers began a threeday strike for better pay on Monday, with their union pointing to further action should South Korea39;s biggest conglomerate continue to fall short of its demands.

The National Samsung Electronics Union NSEU, whose roughly 30,000 members make up almost a quarter of the firm39;s South Korean workforce, also wants an extra day of annual leave for unionised workers and changes to the employee bonus system.

Low participation and automated production means the strike is unlikely to have a significant impact on output at the world39;s biggest memory chipmaker, analysts said. Still, it signals a decline in staff morale at a pivotal point in the chip industry as tech firms embrace artificial intelligence.

The union39;s first industrial action last month involved coordinating annual leave to stage a mass walkout, which Samsung said had no impact on business activity. The firm said on Monday there was no disruption in production.

The union, which did not disclose last month39;s strike participation levels, said 6,540 workers will be striking this week, mostly at manufacturing sites and in product development. It said the strike includes workers who monitor automated production lines and equipment so operations could be affected.

Union officials said about 3,000 strikers attended a rally in the rain near Samsung39;s headquarters in Hwaseong, south of Seoul.

Union president Son Woomok disputed media…