Ansi Numbers

ANSI numbers

IEEE Standard Electric Power System Device Function Numbers acc. to IEEE C.37.2-1991

1MRB520165-Ben

Page 1 Issued: July 1998 Changed: since April 1996 Data subject to change without notice

Device function numbers standardized by IEEE and updated from time to time are used in many countries. Each number with its corresponding function name and the general description of each function is listed below. For more information the relevant standards are to be consulted.

out of operation under abnormal conditions. 5. stopping device. A control device used primarily to shut down equipment and hold it out of operation. (This device may be manually or electrically actuated, but it excludes the function of electrical lockout [see device function 86] on abnormal conditions.) 6. starting circuit breaker. A device whose principal function is to connect a machine to its source of starting voltage. 7. rate-of-rise relay. A relay that functions on an excessive rate-of-rise of current. 8. control power disconnecting device. A disconnecting device, such as a knife switch, circuit breaker, or pull-out fuse block, used for the purpose of respectively connecting and disconnecting the source of control power to and from the control bus or equipment. NOTE: Control power is considered to include auxiliary power that supplies such apparatus as small motors and heaters. 9. reversing device. A device that is used for the purpose of reversing a machine field or for performing any other reversing functions. 10. unit sequence switch. A switch that is used to change the sequence in which units may be placed in and out of service in multiple-unit equipment. 11. multifunction device. A device that performs three or more comparatively important functions that could only be designated by combining several of these device function numbers. All of the functions performed by device 11 shall be defined in the drawing legend or device function definition list.

Standard device...