Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current

HELECTRICITY H01Electric elements H01HELECTRIC SWITCHES RELAYS SELECTORS EMERGENCY PROTECTIVE DEVICES

H01H47/00Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current

H01H47/001Functional circuits H01H47/002Monitoring or fail-safe circuits H01H47/004using plural redundant serial connected relay operated contacts in controlled circuit H01H47/005Safety control circuits therefor H01H47/007with galvanic isolation between controlling and controlled circuit H01H47/02for modifying the operation of the relay H01H47/04for holding armature in attracted position H01H47/043making use of an energy accumulator H01H47/06by changing number of serially-connected turns or windings H01H47/08by changing number of parallel-connected turns or windings H01H47/10by switching-in or -out impedance external to the relay winding H01H47/12for biasing the electromagnet H01H47/14for differential operation of the relay H01H47/16for conjoint H01H47/18for introducing delay in the operation of the relay H01H47/20for producing frequency-selective operation of the relay H01H47/22for supplying energising current for relay coil H01H47/223adapted to be supplied by AC H01H47/226for bistable relays H01H47/24having light-sensitive input H01H47/26having thermo-sensitive input H01H47/28Energising current supplied by discharge tube H01H47/30by gas-filled discharge tube H01H47/32Energising current supplied by semiconductor device H01H47/325by switching regulator H01H47/34Energising current supplied by magnetic amplifier H01H47/36Relay coil or coils forming part of a bridge circuit