What does the 'H' mean?

Question

What does the 'H' mean?

MacGyverS2000 (Electrical)

(OP)

10 Feb 16 12:18

I'm looking at the plate on a switch and I see multiple ratings on the front:
1/4 H.P. 120-240 V.A.C.
3A-240 V.A.C.
13A-120 V.A.C. (H)

On the back, a stamp reads:
6A-120 V.A.C.

I'm interested in why the multiple 120VAC ratings for the same item, but I'm mostly interested in what the 'H' stands for (which I'm sure will answer the first part).

Dan - Owner
http://www.Hi-TecDesigns.com

MacGyverS2000 (Electrical) · Answer 1 · 2016-02-10 12:43:51

I found this:

Quote:
An "H" rating denotes a non-inductive resistive rating. Ratings listed... may appear with the symbol "H" or with the words "non-inductive" or "resistive". "H" ratings are typically required for switches used in commercial oven applications.

Does that seem like the definition of the 'H' shown above?

Dan - Owner
http://www.Hi-TecDesigns.com

itsmoked (Electrical) · Answer 2 · 2016-02-10 20:13:26

Yep, I think you've got it there.

Now, about that other 120V rating... I don't know.

Keith Cress
kcress - http://www.flaminsystems.com

VEBill (Military) · Answer 3 · 2016-02-10 21:38:34

'Heater' ?

MacGyverS2000 (Electrical) · Answer 4 · 2016-02-11 12:33:02

It's the control switch for an oil heater, so "resistive element" fits the bill. These switches are also often used, evidently, for small motor control (my guess is fans and the like).

I just wanted to verify the actual spec on this switch before spec'ing a replacement.

Dan - Owner
http://www.Hi-TecDesigns.com

PARAMOUNT99 (Electrical) · Answer 5 · 2016-03-03 15:43:00

H= Heater
Heater =coil heater = resistive= non-inductive thumbsup

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What does the 'H' mean?