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2. Protective relay - Wikipedia

   en.wikipedia.org/wiki/Protective_relay

   An overcurrent relay is a type of protective relay which operates when the load current exceeds a pickup value. It is of two types: instantaneous over current (IOC) relay and definite time overcurrent (DTOC) relay. The ANSI device number is 50 for an IOC relay or a DTOC relay. In a typical application, the over current relay is connected to a ...

3. Power system protection - Wikipedia

   en.wikipedia.org/wiki/Power_system_protection

   Time overcurrent protection operates based on a current vs time curve. Based on this curve, if the measured current exceeds a given level for the preset amount of time, the circuit breaker or fuse will operate.

4. Current limiting - Wikipedia

   en.wikipedia.org/wiki/Current_limiting

   According to the 2020 NEC/NFPA 70, a current-limiting overcurrent protective device is defined as, "A device that, when interrupting currents in its current-limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid ...

5. ANSI device numbers - Wikipedia

   en.wikipedia.org/wiki/ANSI_device_numbers

   51LR - AC Inverse Time Overcurrent (Locked Rotor) Protection Relay; 51N - Neutral Time Overcurrent; 51P - Phase Time Overcurrent ... hence a "51G" is a time ...

6. Numerical relay - Wikipedia

   en.wikipedia.org/wiki/Numerical_relay

   50 – Instantaneous Overcurrent (N for neutral, G for ground current) 51 – Inverse Time Overcurrent (N for neutral, G from ground current) 59 – Over Voltage; 62 – Timer; 64 – Ground Fault (64F = Field Ground, 64G = Generator Ground) 67 – Directional Over Current (typically controls a 50/51 element) 79 – Reclosing Relay

7. Overcurrent - Wikipedia

   en.wikipedia.org/wiki/Overcurrent

   Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks. Circuit breakers, relays, and fuses protect circuit wiring from damage caused by overcurrent. [1]

8. Residual-current device - Wikipedia

   en.wikipedia.org/wiki/Residual-current_device

   Residual-current and over-current protection may be combined in one device for installation into the service panel; this device is known as a GFCI (Ground-Fault Circuit Interrupter) breaker in the US and Canada, and as a RCBO (residual-current circuit breaker with over-current protection) in Europe and Australia.

9. Fuse (electrical) - Wikipedia

   en.wikipedia.org/wiki/Fuse_(electrical)

   In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.