In low concentration it should not be harmful to your cat. It is considered slightly toxic to all mammals, the effect on cats and humans should be the same.
Benzalkonium is used as a fungicide in antiseptics designed for pets, such as Tomlyn Fungisan for Cats. Moist towelettes will not cause any harm if used reasonably.
Cats clean themselves naturally and rarely need bathing. Benzalkonium Chloride can do damage rather than good by potentially causing harmful allergic skin reations in cats.
Yes, benzalkonium chloride is safe for felines. Benzalkonium chloride can found in many cat products. Benzalkonium chloride is a disinfecting agent that helps promote healthy skin.