IEEE Std C37.13-2015 pdf download – IEEE Standard for Low-Voltage AC Power Circuit Breakers Used in Enclosures.
anti-pump (pump-free) device: A device that prevents reclosing after an opening operation as long as the device initiating closing is maintained in the position for closing. clearing time (of a mechanical switching device): The interval between the time the actuating quantity in the main circuit reaches the value causing actuation of the release and the instant of final arc extinction on all poles of the primary arcing contacts. frame size: The maximum continuous current rating in amperes for all parts except coils and sensors of trip maximum continuous current rating in amperes for all parts except coils and sensors of trip systems and the fuses (for fused circuit breakers). low-voltage fused power circuit breaker: An assembly of an ac low-voltage power circuit breaker with either integrally mounted or nonintegrally mounted current-limiting fuses that function together as a coordinated protective device.
NOTE—Secondary disconnecting devices are often referred to as “secondary disconnects.” silver-surfaced or equivalent: Metallic materials having satisfactory long-term performance that operate within the temperature rise limits established for silver-surfaced electrical contact parts and conducting mechanical joints. trip-free: The capability of a switching device to have the moving contacts return to and remain in the open position when the opening operation is initiated after the initiation of the closing operation, even if the closing force and command are maintained. Note that to help ensure proper breaking of the current that may be established, it may be necessary for the contacts to momentarily reach the closed position. Note that if the release circuit is completed through an auxiliary switch, electrical release will not take place until such auxiliary switch is closed.
The circuit breaker rated continuous current capabilities are demonstrated by compliance with the applicable test requirements in ANSI C37.50. a) Circuit breakers with rated power frequency of 50 Hz shall be required to meet the temperature rise limits of Table 1 when tested in accordance with the continuous current test requirements of ANSI C37.50 at either rated power frequency of 50 Hz or 60 Hz. b) Circuit breakers with rated power frequency of 60 Hz or 50 Hz/60 Hz shall be required to meet the temperature rise limits of Table 1 when tested in accordance with the continuous current test requirements of ANSI C37.50 at rated power frequency of 60 Hz.