- E-T-A Circuit Breakers is a world leading manufacturer of circuit breakers and is a single-source supplier for most circuit protection technologies: thermal, thermal-magnetic, magnetic, high performance and electronic. E-T-A circuit breakers are available in more than 150 models and 300,000 different configurations. E-T-A is also a leading manufacturer of solid state remote power controllers (SSRPCs). All E-T-A circuit protection devices are RoHS compliant.