H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
B—PERFORMING OPERATIONS; TRANSPORTING
B61—RAILWAYS
B61H—BRAKES OR OTHER RETARDING DEVICES SPECIALLY ADAPTED FOR RAIL VEHICLES; ARRANGEMENT OR DISPOSITION THEREOF IN RAIL VEHICLES
B61H13/00—Actuating rail vehicle brakes
B61H13/20—Transmitting mechanisms
B61H13/30—Transmitting mechanisms adjustable to take account of variation of vehicle weight
B61H13/32—Transmitting mechanisms adjustable to take account of variation of vehicle weight by varying brake lever leverage