What size ring connector is needed to attach wire to terminals?

They are #8 as described in the description. Hard to find #8 rings in heat shrink connectors. #10 worked just fine for the terms and it seems all manufacturers sell this size.

Can I run +/- from batt to 100 amp breaker then +/- to fuse box so I can kill power to fuse box?

Yes you can. The fuse box will be powered off breaker. I used a toggle switch panel instead of a main breaker.

Product page says this can handle 100 amps per block, does that mean 100 amps on the left 6, and another 100 on the right?

No, it means 100a peak draw for the entire block...30a peak per circuit. The main positive in should be fused at 125 per the specs from BlueSea.

Does this block come with a positive and a negative bus? I don't want to have to daisy chain the positive lead to each lead on the panel...

Yes, it does indeed come with both a positive (fused) bus and a negative bus. Very nice unit, as with all Blue Sea products. I would and have bought again after purchasing mine.

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ST Blade Fuse Block

Product ID: 249495008

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Details

Current rating
100 Amps
Connector type
Screw
Number of contacts
12
Mounting type
screw mount
Material
Tinned Copper

⚡Supports up to 30A per circuit & 100A total

🔋12 circuits for versatile power management

🔧Push-button latch for quick fuse access

Description

⚡ Stay Powered, Stay Protected — Fuse Like a Pro!

EFFORTLESS MAINTENANCE - Innovative push-button latch cover meets ABYC/USCG insulation standards and allows easy fuse access.
ROBUST CURRENT HANDLING - Handles up to 30 amps per circuit and 100 amps total, ensuring reliable performance under load.
SPARE FUSE STORAGE ONBOARD - Integrated storage for two spare fuses keeps you prepared and minimizes downtime.
BUILT FOR SAFETY COMPLIANCE - Includes negative bus and positive distribution bus with #10-32 stud, engineered for marine and automotive standards.
POWER YOUR PROJECTS WITH PRECISION - 12-circuit ST blade fuse block designed for seamless multi-circuit protection.

The Blue Sea Systems ST Blade Fuse Block is a compact, 12-circuit fuse block engineered for professional-grade power distribution. Rated for 32V DC with a max of 30A per circuit and 100A total, it features a negative bus, positive distribution bus with #10-32 stud, and a push-button latch cover that meets ABYC/USCG insulation standards. Designed for easy fuse access and onboard spare fuse storage, it supports ATO and ATC fast-acting blade fuses, making it ideal for marine, automotive, and industrial applications.

Specifications

Action	add
Color	Beige
Size	One Size
Style	12 Circuit + Neg
League	Blue Sea Systems
Team	Blue Sea Systems
connector-type	Screw
Length	9.25 inches
Weight	0.8 Pounds
Width	3.94 inches
Material Type	Tinned Copper
Number of Items	1
Number of Pieces	5
Usage	personal
Wattage	3200 watts
Included Components	FUSE BLOCK ST BLADE 12 W/GRD/CVR
Batteries Included?	No
Brand	Blue Sea Systems
Department	unisex-adult
Manufacturer	Blue Sea Systems
Item model number	5026
Product Dimensions	25.4 x 10.16 x 5.08 cm; 100 g
ASIN	B001P6FTHC

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