NO!
Use only a circuit that has a breaker for the correct amperage. To avoid the risk of a house fire you must change the breaker to the required 30 amps. <><><>
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work
AND
always use an electricians test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
The outlet is rated for 30A, so anything up to, but not exceeding 30A can be plugged in.
You can, but be advised that whatever you plug into the new outlet should not exceed 5000W capacity (20A x 250V = 5000W)or you could risk overheating the new outlet with serious results. To prevent this, you should make sure the circuit breaker is a 20A also.
30a-6 = 24
2 x 3 x 5 x a = 30a
This is a special purpose outlet, likely for a dryer. Normally in a house electric panel you have 120 VAC as the normal and 220 or 240 as a higher voltage. The 30 A is for 30 Amps. You can only plug in an appliance that has those ratings. You can't plug in a 120 V device.
30a is bigger than a 30 AA
According to a couple searches the value should fall in the $275 - $375 range depending on condition.
a 30a bust is tiny usually in a child who is starting to mature
If you want an American plug to power a 30A 220V device look at a dryer outlet. It will have an extra neutral conductor, but it is standard. Otherwise, you can go with a 220V 30A TwistLok plug. All the home centers [I've been to] carry these plugs. 10ga wire is heavy enough for 30A runs under 75ft, though for a 27A appliance you should consider a 40A breaker with 8ga wire.
36
Your Glenfield model 30A was made in the year 1979.
12:00a He-man, 12:30a He-man, 1:00a She-ra, 1:30a She-ra, 2:00a Bravestar, 2:30a Bravestar, 3:00a Ghostbusters, 3:30a Ghostbusters, 4:00a Spliced, 4:30a Spliced, 5:00a Sitting Ducks (95% sure this is the right schedule)