I am looking for relay With good DC voltage handling capacity. All electro magnetic relays can handle more AC voltage for same current rating. Is any such relay that can handle higher DC voltage say around 100v with 10A rating.
In DC the impedance of the coil of the relay is only the resistance, then, the current is higher than in AC, and then the coil heating is higher. You can limitate the current in DC using a voltage divisor.
Well, you know, just about anything can be designed, if there's a need. There are some high voltage DC relays available here, for example:
https://www.relayspec.com/specs/022000/Kilovac%20cat%20pages.pdf
I agree with Andres that a voltage divider can be used to make a high voltage DC sensing relay from the more traditional low voltage ones commonly available. I have to think that the only reason AC relays sense high voltage is that they are typically used to sense your 115 VAC or 230 VAC mains voltage, whereas DC sensing relays are meant to sense DC trigger signals, or in automotive applications, where low voltages are preferred for any number of reasons. In fact, a very common sensing voltage for DC relays is 12V.
Some FETs have capability to do this function. why not use them?
Also see
http://www3.panasonic.biz/ac/e_download/control/relay/interception/catalog/mech_eng_interception_speclist.pdf?f_cd=401974
Thank you dear V.s.V Mani&Anton Driiesse for your appropriate and useful answers.Anton's answer clarifies the doubt & mani's answer and the link provided is much useful. Thank you very much.
With regards
Vasantha
Adding a snubber network across the contacts will also go a long way to prolonging their life. 100 Ohm + 0.1 uF in series works well as does a flywheel diode across the load if it is inductive.
Heavy duty relays:
https://www.omron.com/ecb/products/pdf/J144-E1-05.pdf
Alternatively look for a solid-state device:
http://www.crydom.com/en/
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