Circuit Breaker

Y09 means one of two things,, When it was made or the case and terminal style, Ignore that and go with the 6 Amp.

NOTE: 12 volts is a "Minimum" rating, if you get one rated for 24 or 48, that's good too. You won't find one rated for less than 12 so don't worry about that.

There are basically only a few factors other than the case/terminal arrangement
Max voltage
Trip current
Delay
Delay is flexible on most systems, and often not specified
Self resetting/Manual reset
And "Hold off resetting till current stops" (I think the Shortstop line does this, once it tripps it stays tripped till power is removed or the short(all loads) are removed).

Circuit Breaker + Electronics = Bad Ju Ju

Thermally sensitive
Incredibly imprecise response
Only a reset upon disconnect/reconnect would prevent battery drain during a fault

It's why electronics have fuses. It's why $$$ inverters use fuses. Oh shoot even a Wif-Co uses a fuse.

Power windows in cars have power off reset circuit breakers. So when Little Susie cranks up the window on brother Johnny's neck when mom returns she can twist the ignition key and the breaker will have reset. Dunno about Johnny - he'll be harder to reset.

It would not be 60A as the short stop series maxes out at 50A. 6A is an odd size but I've seen one on my motorhome and ended up replacing it with a 5A fuse. I think it goes to the memory backup power for the radio but I am not sure.

If this is perchance for a Coachmen RV and it has a little bus bar and plastic holder arrangement for up to four of these breakers, I'd suggest replacing the plastic holder with the equivalent metal bracket that wiring products sells. The reason is that the plastic holder insulates one of the lead wires from the base of the terminal stud on the breaker, forcing the current to flow through the nut and the threaded interface between it and the stud. The threaded junction is not designed to be a current carrying connection. (The metal brackets have the same spacing ad the plastic holder so the little bus bar piece will still work.)

Junk. Get a Hi-Amp. 6 amps? Probably 60.

https://www.amazon.com/Bussmann-CB185-60-High-Amp-Breaker

See pg 30 http://www1.cooperbussmann.com/pdf

This website might have what you are looking for. Good luck, hope it helps.

Bussman 'shortstop CBs'


Most auto parts stores carry them also