The ETR2-21 is a two-pole, one-pole Thermal Magnetic Circuit Breaker from Eaton. It is rated at 20 A and is designed for use in residential and light commercial applications. This circuit breaker features a thermal magnetic positive trip characteristics, with a self-protected UL489 conformity. It also has an adjustable instantaneous trip setting, includes a test button, and has a Class B thermal shock rating. The ETR2-21 is both Agency Listed and CSA Certified.