Acute Coronary Syndrome (ACS): The description of "electric" chest pain, although not a typical descriptor, could be interpreted as a severe, sharp, or stabbing pain, which is sometimes reported in ACS. The fact that it doesn't worsen with breathing makes ACS a more likely consideration than a pulmonary cause.

Gastroesophageal Reflux Disease (GERD): Chest pain that is sharp or burning and does not necessarily worsen with breathing could be due to GERD, especially if it is accompanied by other symptoms like heartburn or regurgitation.
Musculoskeletal Pain: Strain or inflammation of the muscles or cartilage in the chest wall can cause sharp pains that do not change with respiration.
Costochondritis: Inflammation of the cartilage that connects the ribs to the sternum can cause sharp chest pains that are not affected by breathing.

Pulmonary Embolism (PE): Although the pain does not worsen with breathing, it's crucial not to miss PE, as it can present atypically and is life-threatening. Any chest pain of sudden onset should prompt consideration of PE.
Aortic Dissection: A severe, tearing chest pain that can be constant and not necessarily affected by breathing. It is a medical emergency.
Esophageal Rupture: A severe, sharp pain that can be constant, often associated with difficulty swallowing or vomiting. It requires immediate medical attention.

Pericarditis: Inflammation of the pericardium, the sac surrounding the heart, can cause sharp chest pain that may not worsen with breathing. It's less common but should be considered, especially with other symptoms like fever or a pericardial friction rub.
Pneumothorax: While typically worsening with breathing, a small pneumothorax might not always present with respiratory-related exacerbation of pain. It's rare for the pain not to be affected by breathing, but it's a critical diagnosis not to miss.