on the ss2 safety switch does it have a normally open contact or is it normally closed?

The switch is normally closed. When water raises the float this opens the connection. These float switches go bad every so often. In the case where the switch has gone bad and you are sure you do not have condensate clog in your line, you can cut the wire at the top of switch and twist together the wire to the unit and cover with a wire nut. You are going to have the switch replaced anyway, so you might as well enjoy your A/C without paying for an emergency visit from your local HVAC professional. Do this only if you are 100% sure you do not have a clogged line. I take no responsibility if your line is clogged and you suffer water damage.

Can this be put into a secondary drain pan that sits under the ac?

I don't see why not. Just make sure you have the wiring set up correctly to shut down the unit. I assume there is another switch in the primary drain pan.

Can the float level be adjusted, by rotating the float shaft on a thread(?), or ?

No, I don't believe it is adjustable. Since it is designed as a type of safety switch (to turn off AC unit) there isn't a need to adjust.

What is the inside diameter of the pipe that the switch slides into? Does the switch use a float?

3/4 inch id. switch does use a float

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Description

🛠️ Stay cool, stay protected — never miss a drip with Safe-T-Switch SS2!

COMPACT DURABLE - IP53 rated with metal contacts and a robust design built to withstand up to 125°F environments.
SMART CLOG DETECTION - Automatically shuts off your A/C system to prevent water damage and costly repairs.
FLEXIBLE INSTALLATION - 3/4" adapter and magnetic reed switch enable versatile mounting on primary or auxiliary drain pans.
TRADE TRUSTED QUALITY - From RectorSeal, a leader in HVAC and plumbing solutions trusted by professionals nationwide.
MAINTENANCE MADE SIMPLE - Adjustable float and quick switch access streamline servicing and reduce downtime.

The Rectorseal 97637 Safe-T-Switch SS2 is a professional-grade condensate overflow switch designed to detect clogged A/C drains and automatically shut off the system. Featuring a magnetic reed switch for flexible off-center installation, an adjustable float for easy maintenance, and a 3/4" adapter for versatile mounting, it ensures reliable protection against water damage. Rated for 24V AC at 1.25 amps and IP53 protection, this compact switch is a trusted solution for HVAC professionals seeking durable, efficient condensate management.

Specifications

Operation Mode	ON-ON
Current Rating	25 Amps
Operating Voltage	110 Volts
Contact Type	Normally Closed
Connector Type	Plug In
Brand	Rectorseal
Terminal	Plug In
Item dimensions L x W x H	5.1 x 14 x 21 Centimeters
Circuit Type	1-way
Actuator Type	Magnetic Reed
Contact Material	Metal
International Protection Rating	IP53
Number of Positions	1
Upper Temperature Rating	125 Degrees Fahrenheit
Controller Type	Push Button
Control Method	Touch
Connectivity Protocol	X-10
Colour	White
Wattage	30 Watts
Net Quantity	1.0 Count
Number of Items	1
Global Trade Identification Number	00021449976374
Manufacturer	The Rectorseal Corporation
UPC	021449976374
Country of Origin	USA
Item model number	97637
Product Dimensions	5.08 x 13.97 x 20.96 cm; 208.65 g
ASIN	B005D4RFEM

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