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2. Current sensing - Wikipedia

   en.wikipedia.org/wiki/Current_sensing

   Fiber optic current sensor, using an interferometer to measure the phase change in the light produced by a magnetic field. Rogowski coil, electrical device for measuring alternating current (AC) or high speed current pulses. Giant Magnetoresistance(GMR): Magnetic field sensor suitable for AC & DC Current with higher accuracy than Hall Effect ...

3. Solid-state relay - Wikipedia

   en.wikipedia.org/wiki/Solid-state_relay

   A solid state relay (SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay , but solid-state electronics contain no moving parts and have a longer operational lifetime.

4. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time. For many years relays were the standard method of controlling industrial electronic systems. A number of relays could be used together to carry out complex functions (relay logic). The principle of relay ...

5. Hall effect sensor - Wikipedia

   en.wikipedia.org/wiki/Hall_effect_sensor

   In such a case the Hall sensor is mounted in a gap in the magnetic core around the current conductor. [24] As a result, the DC magnetic flux can be measured, and the DC in the conductor can be calculated. Hall effect current sensor with internal integrated circuit amplifier. 8 mm opening. Zero current output voltage is midway between the supply ...

6. Earth-leakage circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Earth-leakage_circuit_breaker

   To address this the IEC introduced the term residual current device (RCD). Residual current refers to any residue when comparing current in the outbound and return currents in the circuit. In single phase circuits this is simply the line or phase current minus the neutral current. In a 3 phase circuit all current carrying conductors must be sensed.

7. ANSI device numbers - Wikipedia

   en.wikipedia.org/wiki/ANSI_device_numbers

   72 - DC Circuit Breaker; 73 - Load-Resistor Contactor; 74 - Alarm Relay; 75 - Position Changing Mechanism; 76 - DC Overcurrent Relay; 77 - Telemetering Device, Speed Sensor; 78 - Phase Angle Measuring or Out-of-Step Protective Relay; 78V - Loss of Mains; 79 - AC Reclosing Relay / Auto Reclose; 80 - Liquid or Gas Flow Relay; 81 - Frequency Relay ...