The £30m turnover Cannock based specialist is in the hands of administrator Leonard Curtis who filed an update at Companies House last week.
It revealed that some of the assets of TNA Electrical including its fleet of four vans and office equipment was acquired by TNA Mechanical Ltd.
TNA Electrical was founded by brothers Andrew (pictured) and Neil Jones in 2009.
The brothers were also directors of TNA Mechanical until last month when Companies House records show they resigned and were replaced by Gemma Jones and Ann Jones.
Leonard Curtis said TNA Electrical was sunk by fixed-price contracts and bad debts and unsecured creditors would not be seeing any money back on their debts.