fc-72 series fire alarm system
... Any fire alarm system may fail for a variety of reasons: Smoke detectors may not sense fire where smoke cannot reach the detectors such as in chimneys, in walls, on roofs, or on the other side of closed doors. Smoke detectors also may not sense a fire on another level or floor of a building. A secon ...
... Any fire alarm system may fail for a variety of reasons: Smoke detectors may not sense fire where smoke cannot reach the detectors such as in chimneys, in walls, on roofs, or on the other side of closed doors. Smoke detectors also may not sense a fire on another level or floor of a building. A secon ...
excerpt
... thereafter, the second device opens. In either case, three-phase motors are protected against balanced voltage overload conditions. ...
... thereafter, the second device opens. In either case, three-phase motors are protected against balanced voltage overload conditions. ...
8536 - Ministry of Commerce and Industry
... sometimes difficult to locate in standards." IEC 60146-1-1 Ed. 3.0 b:1991 Semiconductor convertors - General requirements and line commutated convertors - Part 1-1: Specifications of basic requirements Part 1-1: Specifications of basic requirements Specifies the requirements for the performance of a ...
... sometimes difficult to locate in standards." IEC 60146-1-1 Ed. 3.0 b:1991 Semiconductor convertors - General requirements and line commutated convertors - Part 1-1: Specifications of basic requirements Part 1-1: Specifications of basic requirements Specifies the requirements for the performance of a ...
IEEE-PSRC_Report_D8_.. - pes-psrc
... communication paths. This is the main benefit of pilot protection. However, as the zone boundaries are geographically dispersed, a communication medium is required to consolidate measurements from all line terminals. The capabilities of the applied communication channels may constrain the type of co ...
... communication paths. This is the main benefit of pilot protection. However, as the zone boundaries are geographically dispersed, a communication medium is required to consolidate measurements from all line terminals. The capabilities of the applied communication channels may constrain the type of co ...
The Art and Science of Protective relaying
... connections,, 52 power, 52 short circuits, 56 characteristics on R-X diagram, 74 d-c types,, 49 use of shunts, 52 effect of mutual induction on ground relays, 393 electromagnetic-attraction type, 24 groundrelay polarization, 151, 326 misoperating tendencies, 314 negative-phase-aequence type, 330 ope ...
... connections,, 52 power, 52 short circuits, 56 characteristics on R-X diagram, 74 d-c types,, 49 use of shunts, 52 effect of mutual induction on ground relays, 393 electromagnetic-attraction type, 24 groundrelay polarization, 151, 326 misoperating tendencies, 314 negative-phase-aequence type, 330 ope ...
Electrical operating instructions - GfA
... and protective devices. Care should be taken that any seals are fitted correctly and screw couplings are tightened correctly. In the case of ELEKTROMATEN® with a permanent mains connection, an all-pole main switch with appropriate back-up fuse must be provided. Check live cables and conductors regul ...
... and protective devices. Care should be taken that any seals are fitted correctly and screw couplings are tightened correctly. In the case of ELEKTROMATEN® with a permanent mains connection, an all-pole main switch with appropriate back-up fuse must be provided. Check live cables and conductors regul ...
Table of Contents HARTMAN Power Switching Contactors
... Circuit Configurations (Consult factory for other available circuit configurations) ...
... Circuit Configurations (Consult factory for other available circuit configurations) ...
Datasheet
... with protection against accidental contact with live circuits. This is of particular importance in applications where DC voltages exceed 30 volts and can be health threatening. ...
... with protection against accidental contact with live circuits. This is of particular importance in applications where DC voltages exceed 30 volts and can be health threatening. ...
Relay
A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits), or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits as amplifiers: they repeated the signal coming in from one circuit and re-transmitted it on another circuit. Relays were used extensively in telephone exchanges and early computers to perform logical operations.A type of relay that can handle the high power required to directly control an electric motor or other loads is called a contactor. Solid-state relays control power circuits with no moving parts, instead using a semiconductor device to perform switching. Relays with calibrated operating characteristics and sometimes multiple operating coils are used to protect electrical circuits from overload or faults; in modern electric power systems these functions are performed by digital instruments still called ""protective relays"".