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BS 4999-111

1987 Edition, February 27, 1987

Complete Document

General Requirements for Rotating Electrical Machines Part 111: Built-In Thermal Protection for Electric Motors Rated at 660 Volts a.c. and Below

Detail Summary

Superseded By: BS EN 60034-11

Additional Comments:
W/D S/S BY BS EN 60034-11
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Description / Abstract:

Classifies types of protection, specifies winding temperatures for steady overload and stalled conditions. Recommends thermistor reference temperatures. Characteristics for thermostats, thermistors and thermistor control units with appropriate tests. Thermistors are of positive temperature coefficient. An appendix gives typical characteristic curve.