Union officials are expected to meet Braun Ireland management in Carlow today in a bid to resolve a dispute that led to the issuing of protective notice to about 600 workers yesterday.
The factory, which makes electrical and hair care products, is the largest private sector employer in Carlow town, employing about 700 people.
The protective notice was issued to staff in the industrial and technical area yesterday, following a dispute with SIPTU over redundancy terms.
In a statement issued yesterday, Braun Ireland said it was placing its industrial and technical workforce on protective notice "resulting from an unofficial ban on overtime endorsed by SIPTU".
The statement said the grievance resolution steps had not been exhausted before the unofficial overtime ban was begun.
SIPTU's Carlow branch secretary, Mr Michael Browne, said the union was hopeful that a resolution could be found.
Carlow Chamber of Commerce said no job losses had been announced yet.