Relay characteristics parameters terminology

Jun. 25, 2017

1.Insulation resistance: it is the impedence when the conductors insulated with insulating material are applied to voltage and it is generally shown in "MΩ". The speculated voltage discribed above are general 500Vd.c.(or 250Vd.c.).


2.Dielectric strength: it is the voltage value when, within the speculated time, the conductors insulated with insulated material are applied to the voltage and the leakage current is less than the speculated current. The certain voltage above generally is the effective value of AC voltage and unless otherwise stated, the leakage current is generally less than 1mA.


3.Operation time: it refers to, with the relay in the released state, the elapsed time from the initial application of power to the coil, till the closure of the normal open contacts. It does not include any bounce time, and expressed in "ms".


4.Release time: it refers to, with the relay in the operation state, the elapsed time from the initial removal of coil power till the re-close of the normal closed contacts. It doesn't include bounce time and expressed in "ms".


5.Bounce time: it generally refers to the time from the initial close of the contacts till the complete close and generally expressed in "ms".


6.Switching frequency: it refers to the cycling times of the operation and release in united time.


7.Ambient temperature: it refers to the temperature in which the relay can normally be applied and it is generally expressed in the range of temperature.


8.Coil temperature rise: it refers to the temperture that the coil rises by after the temperature becomes stable and under the conditions that in the suitable maximum ambient environment the rated voltage is impressed on the coil and the rated load is impressed on the contacts. Generally it refers to the maximum value, expressed in "K".


9.Humidity: it refers to the required humidity in which the relay can reliably work and generally expressed in relative humidity "%RH".


10.Model of the terminals: the terminals model of the relays also shows the application fields. Generally speaking, the models of terminals are PCB,THT,SMT,Plug-in,QT and others.


11.Enclosure type: it refers to the protection mode for the relay body. It is divided into open type,dust proofed,flux proofed and sealed types.

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