is this switch a 3 prong?

Yes, it has 3 spade connectors on the back

What are the dimensions

Dimensions: 2-3/16"W x 2-3/4"H Requires 7/8" x 1-5/8" mounting hole

Is this switch intended to be used with the full windlass supply current running through it? How many terminals are on the back?

NO! It needs to activate a solenoid that is designed to handle the current. I am not at the boat but I think there are three terminals on the back, one being common.

Can this switch be installed on the bow next to the windlass, in addition to the windlass switch already on the helm?

It's not something that I would do as it's not a weatherproof switch. On my boat, I've installed a handheld, wired remote at the bow. I believe that's the more common path taken.

Operation Mode	ON-OFF
Current Rating	5 Amps
Operating Voltage	24 Volts
Contact Type	Normally Closed
Connector Type	Clamp
Brand	Lewmar
Terminal	Screw
Item dimensions L x W x H	5.5 x 4.5 x 2 inches
Circuit Type	1-way
Actuator Type	Rocker
Contact Material	Brass
International Protection Rating	IP65
Number of Positions	2
Control Method	Touch
Connectivity Protocol	X-10
Color	Black
Wattage	1.2E+2
Unit Count	1.0 Count
Number of Items	1
Global Trade Identification Number	00743683317088
Manufacturer	Lewmar, Inc.
UPC	743683317088
Item Package Dimensions L x W x H	9.29 x 5.51 x 2.2 inches
Package Weight	0.05 Kilograms
Item Dimensions LxWxH	5.5 x 4.5 x 2 inches
Brand Name	Lewmar
Warranty Description	Warranty
Model Name	68000593
Suggested Users	Marine
Part Number	68000593
Model Year	2016
Included Components	Great Product
Size	One Size
Sport Type	Marine

Lewmar Guarded Rocker Switch, Black, 12V or 24V DC, 5 Amp, Dual Direction Up Down Remote Windlass Control for Helm, Wheelhouse or Flybridge, Plastic Safety Guard Prevents Activation – 68000593

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