Influencing factors of relay reliability

1 the impact of the environment on the reliability of the relay: the relay operates at GB and SF, the average time between failures is highest, reaching 820000h, while in the NU environment, only 60000h.

2 the quality grade of the reliability of the relay selection: when the quality of A1 relay, MTBF of up to 3660000h, and the selection of relay MTBF C grade was 110000, which is 33 times the impact of the quality level of visible relay reliability is very large. .

3 contact form on the reliability of relays: relay contact form also will affect the reliability of double throw relay reliability single throw relay are higher than the same number of knife, while increasing the reliability with the knife number decreased gradually, MTBF SPST relay is 5.5 times the four pole double throw relay.

4 the influence of the type of structure on the reliability of relay: there are 24 kinds of relay structure types.

5 the influence of temperature on the reliability of relay: the working temperature range between -25 and 70. With the increase of temperature, the mean time between failures of relay decreases gradually.

6 the influence of the rate of action on the reliability of the relay: with the increase of relay operating rate, the average time between failures is basically exponential decline. Therefore, if the design of the circuit requires a very high rate of relay action, then the circuit maintenance need to carefully detect the relay in order to replace it in time.

7 the effect of current ratio on the reliability of a relay: the current ratio is the ratio of the load current to the rated load current. The current ratio greatly affected the reliability of the relay, especially when the current is larger than 0.1, decreased rapidly MTBF, while the current ratio is less than 0.1, the average time between failures is essentially the same, should be in the circuit design the rated current of large load to reduce the current ratio, which can ensure the relay and the whole circuit is not due to work the fluctuation of current and the reliability is decreased.