| ??? 03/07/06 14:29 Read: times |
#111515 - Reply to "replies" Responding to: ???'s previous message |
Suresh said:
iam familiar with the ratings which i have given below. but iam not testing it to use in my circuit but need to do the test and observe the switch life expectancy on such an application (no of cyles passed is to be checked) You don't need to do that. The manufacturer has already done it for you. Just choose a relay, where the switching stress does not exceed the maximum specifications! Suresh said:
yes. i can understand it. but i was asked to do so :( Then, give him a book about how a relay works and what specifications are relevant. Suresh said:
specifications:
The reed switch iam testing is tested for 10W/VA capability. carry current is 1.5A switching current is .5A At normal condition (after the inrush current flows) the switch would experience V*I = 12* .291 = 3.5W At normal condition it satisfies. But at current inrush (which will be for very less time) the power experienced by the switch seem to go high => 12* .291* 8.8 = 30.7296W. Since its going to be for very short period will that affect the performance very badly? Hello??? Of course, it will!!!!!!!!!!!!! Just because your switching current of 2.6A exceeds the maximum specification of 0.5A!!!!!!!!! Suresh said:
i used the 40R to set the current to the lamp load rated 12V / 3.5W. Why that?? That makes the lamp for you, automatically! A 12V-lamp is intended to be connected directly to 12V, without any resistors or other current limiting stuff. Kai |
