I want to use a reed switch to control a 12VDC motor, infrequent use for maybe 10 seconds at a time, 30 seconds max, steady state current draw of maybe 500 milliamps, peak 2 amps. It's not a mission-critical part, failure is at worse a minor inconvenience. The goal is to use parts I have on hand to automate a bothersome task. It'll be a float switch for operating a pump.
I have here a reed relay which tests show will function just fine as a magnetic proximity switch. It's rated 0.5 amps at 120V, or 10W continuous use.
I figure I can always switch a transistor with it, but I'm thinking about just powering the motor directly.
I've done some research on switch design, AC vs. DC applications, arcing, heat, etc. Just wondering, what's the probability of getting a few years' good service in an application like this? A snubber ciruit will improve my chances?
One last question, if anyone cares to comment, I'd appreciate some advice on simple solution to avoid a lot of on/off cycling.
Thanks!