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Device numbers may be combined if the device provides multiple functions, such as the Instantaneous / Time-delay Overcurrent relay denoted as 50/51. [ 3 ] For device 16, the suffix letters further define the device: the first suffix letter is 'S' for serial or 'E' for Ethernet.
Notifier or Notifier by Honeywell is a manufacturer of engineered fire alarm systems with over 500 distributors worldwide, and regional support operations on every continent. [1] Notifier is headquartered in Northford, Connecticut , United States, and is a division of the Honeywell Life Safety Group.
1 out 81b 2 out 82 lock in 82a 1st out 82b 2nd out 82z 1st in 82y 2nd in 83 multi position switch, in 83a out position 1 83b out position 2 Relay; 85 relay coil - Important if relay coil has flyback diode in parallel 86 relay coil + Important if relay coil has diode in parallel Relay contacts 87 common contact 30/51 87a normally closed contact 87b
High voltage interface relays, a.k.a., interface relays: [1] [2] or coupling relays or insulating interfaces [3] [4] is a special class of electrical relays designed to provide informational and electrical compatibility between functional components isolated from each other and not allowing for a direct connection due to a high difference of potentials.
Protective relay. In utility and industrial electric power transmission and distribution systems, a numerical relay is a computer-based system with software-based protection algorithms for the detection of electrical faults. [1] Such relays are also termed as microprocessor type protective relays.
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Electromechanical protective relays operate by either magnetic attraction, or magnetic induction. [9]: 14 Unlike switching type electromechanical relays with fixed and usually ill-defined operating voltage thresholds and operating times, protective relays have well-established, selectable, and adjustable time and current (or other operating parameter) operating characteristics.
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