will the included bus bar support #4 wire?

The Line Terminals (A,B & N) will accept (1)#12-2/0 AL wire or (1)#14-2/0 CU wire. The Ground bar will accept #14-#4 CU wire or #12-#4 AL wire.

what breaker type can be used in the additional slot?

QP breakers can be used in the 2 extra circuit slots. Refer to attached link for wiring information. https://www.downloads.siemens.com/download-center/Download.aspx?pos=download&fct=getasset&id1=BTLV_22648

Could i use a qfga2 breaker on one of the branch circuits?

I would check with a local certified electrician. We are using the panel to run a 220V hot tub.

is the ground bar bonded to the panel or isolated?

To bond the ground and neutral you would add the green bonding screw and to isolate the neutral you would remove the green bonding screw. https://s3.amazonaws.com/dcc-data-extract/new-delta/asset/Compas/daily/Compas/Wiring%20Diagram/W0408L1125SPA50_W0408L1125SPA60_4094709.pdf https://s3.amazonaws.com/dcc-data-extract/new-delta/asset/Compas/daily/Compas/Instruction%20Sheet%20Quick%20Guide/SIE_IS_ECGB5.pdf

AC Adapter Current	125 Amps
ASIN	B004Q0N9OY
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#20,741 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #110 in Pool & Spa Replacement Parts
Brand	SIEMENS
Color	Gray
Customer Reviews	4.6 4.6 out of 5 stars (566)
Date First Available	April 14, 2011
Global Trade Identification Number	00783643448322
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	0.01 ounces
Item model number	W0408L1125SPA50
Manufacturer	Siemens -HI
Material	Aluminum
Number Of Circuits	8
Part Number	W0408L1125SPA50
Phase Type	Single Phase
Power Source	AC
Product Dimensions	12.1"L x 4.4"W x 6.2"H
Style	Spa Panel
UPC	783643448322
Voltage	240 Volts
Warranty Description	10 years-parts only

SIEMENS W0408L1125SPA50 50 Amp 2-Pole GFCI Spa Panel, Rectangular, Gray

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