ANSI/IEEE C37.17:1972

- Superseded.
This standard pertains to direct-acting overcurrent, reverse-current, and undervoltage trip
devices of both the electromechanical and ac solid-state types integral with low-voltage ac and
general-purpose dc power circuit breakers covered by American National Standards. The solid-state
direct-acting overcurrent trip devices may include ground trip elements. These direct-acting
trip devices are sometimes referred to as "opening releases," especially in IEC (International
Electrotechnical Commission) Recommendations or "Specifications."

This standard pertains to direct-acting overcurrent, reverse-current, and undervoltage trip devices of the electromechanical and ac solid-state types integral with lowvoltage ac and general-purpose dc power circuit breakers covered by American National Standards C37.13-1963 (R1969), C37.14-1969, C37.16-1970, C37.19-1963, and C37.28-1969.1 (See Section 12 for complete titles.) The solidstate direct-acting overcurrent trip devices may include ground trip elements