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23 – Temperature control device, Heater; 24 – Volts per Hertz Relay (in some old analog applications, a 59 and an 81 device would be chained together as a 59/81 to implement the equivalent of V/Hz protection) 25 – Synchronizing or Synchronism-check Device; 26 – Apparatus Thermal Device, Temperature Switch; 27 – Undervoltage Relay
The following table provides an overview of the various abbreviations. Within a utilization category, the suitable size may be selected for the respective type. This depends on the rated current, the rated voltage and the electrical load to be switched.
A thermal switch (sometimes thermal reset or thermal cutout (TCO)) is a device which normally opens at a high temperature (often with a faint "plink" sound) and re-closes when the temperature drops. The thermal switch may be a bimetallic strip, often encased in a tubular glass bulb to protect it from dust or short circuit. Another common design ...
An analogue switch: Maxim MAX313. An analogue switch, also called a bilateral switch, is an electronic component that behaves in a similar way to a relay, but has no moving parts. The switching element is normally a pair of MOSFET transistors, one an N-channel device, the other a P-channel device. The device can conduct analog or digital ...
Switch name Cherry MX equivalent Switch Type Actuation force Tactile force Actuation point Total travel Product code Durability (actuations) Cherry: Cherry: Black [1] Cherry MX Black: Linear: 0.60 N: N/A: 2.0 mm: 4.0 mm: MX1A-11xx >100 million Cherry: Cherry: Red [2] Cherry MX Red: Linear: 0.45 N: N/A: 2.0 mm: 4.0 mm: MX1A-L1xx >100 million ...
An electronic symbol is a pictogram used to represent various electrical and electronic devices or functions, such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical or electronic circuit. These symbols are largely standardized internationally today, but may vary from country to country, or engineering ...
These sense the air temperature using the differential expansion of two metals to actuate an on/off switch. [14] Typically the central system would be switched on when the temperature drops below the setpoint on the thermostat, and switched off when it rises above, with a few degrees of hysteresis to prevent excessive switching.
A TRIAC (TRIode AC), equivalent to two back-to-back SCRs, is a bidirectional switching device. A DIAC stands for DIode AC Switch. A gate turn-off thyristor (GTO) is a bipolar switching device. Electronic switches may also consist of complex configurations that are assisted by physical contact, for instance resistive or capacitive sensing ...