However, private sector banks such as ICICI Bank, HDFC Bank and Axis Bank were functioning normally because their staff are not on strike.
Employees are compelled to take this route as the Indian Banks' Association (IBA) did not come up with an improved wage offer, United Forum of Bank Unions (UFBU) Convener M V Murali said. The IBA represents bank managements.
Banks, including the State Bank of India, the country's largest, had informed customers in advance about the likely inconvenience they would face during the strike.
The offer made by bank managements was not in line with rising inflation, General Secretary of National Organisation of Bank Workers Ashwini Rana said.
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The staff of public sector banks had gone on a nationwide strike for a day on December 18 after discussions with the IBA on wages on December 14 failed. The wage revision of public sector bank employees has been due since November 2012.
UFBU is an umbrella organisation of nine bank employee and officer unions.