i can not find anything on a 'SACA-403'...i found a SACA-503...the 5 does indicate 5 ton.
i did find a catalog that shows...
S: Self Contained
A: DX cooling, no heat
A: Development Sequence
40: 4 tons
3: 220/50/3...are you in Europe?
How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...
1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
2. Wait 2 seconds
3. Very carefully remove your meter leads from their storage place and enjoy your new knot!