The task of miniature circuit breakers is to automatically disconnect circuits in order to protect lines and connected devices. After disconnection, they can be manually reactivated without the fuse.

IEC (International Electrotechnical Commission) and UL (Underwriters Laboratories Inc.) are international standardisation organisations for standards in the field of electrical engineering and electronics. In most countries, either IEC or UL standards are valid. Both standards differ significantly. Doepke has miniature circuit-breakers of both standards in its product portfolio.