Question 1

Are these all momentary switches?  need spst black contura ii switch w/illuminated red not momentary,

Accepted Answer

As long as you get one that say off-on it will not be momentary. DO NOT get the switch with ( ) as this means the switch is momentary example off-(on).

Question 2

what are the exact opening dimensions needed for this product to fit in a pannel?

Accepted Answer

Per the Blue Sea Systems Website the cutout dimensions are: 0.83" Wide by 1.45" tall or 21mm x 37mm.

Question 3

Why are the product descriptions and labeling so confusing? I had to look up with the 4-letter acronyms are in the listing, and I still have no idea.

Accepted Answer

I understand the confusion of seeing the designations such as SPDT, DPDT, SPST, DPST etc. These designations refer to the type of switch that you are purchasing. The very simplest version is SPST - Single Pole, Single Throw and is listed as simply ON / OFF in function. Each "pole" refers to the number of circuits that are being turned on or off. So a Single Pole (SP) has just one set or pair of connectors. You would use this on the Red Lead of a power supply for example to turn one thing on or off. Double Pole (DP) has TWO PAIR (4 Connections) that turn TWO circuits ON or OFF at the same time.

Next comes the Single Throw or Double Throw designation (ST or DT portion of SPST or DPDT). This refers to whether the switch does more than just have an off / on function. A single throw (ST) IS Just ON / OFF. But Double Throw means you can have TWO functions controlled by single source of power. Good examples of this are what they call "Three Way Switches" on lights in your home. If you have TWO switches that can turn on /off the hall lights from two different locations you are using Double throw switches - not just ON / OFF but ON / OFF when the two switches are in the same or opposite positions.

So a Single Pole Double Throw switch will have 3 connectors - middle is common and the two outer ones are connected to the center depending on switch position. A Double Pole, Double Throw Switch has 6 Connectors - 3 for each of two circuits.

Making things more interesting is that there are switches that have a "center off" position that allow the switch to move from ON Down to Off Center to ON Up.

If all you want is to turn something ON Or OFF just choose an SPST switch with no special center position and you are set to go. Take note that if you want that light on the switch to come on when the circuit is ON, you will need to wire the switch to provide power for the LED in the switch as well. Blue Sea provides "schematics" or wiring diagrams for all of these switches when you purchase them and you can also find details on their website.

Question 4

spdt, on-off-on, how many pins are in the back?

Accepted Answer

6

ASIN	B00GZOPK3C
Actuator Type	Rocker
Best Sellers Rank	#104,898 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #11 in Boat Toggle Switches
Brand Name	Blue Sea Systems
Circuit Type	1-way
Color	Black
Compatible Devices	12V and 24V electrical systems and devices within 20A and 15A current ratings respectively
Compatible with Vehicle Type	Vehicles with 12V and 24V electrical systems
Connectivity Protocol	X-10
Connector Type	Screw Terminals
Contact Material	Phosphor Bronze
Contact Type	Normally Open
Control Method	Touch
Control Type	Manual
Controller Type	Manual Switch
Current Rating	20 A
Customer Reviews	4.9 4.9 out of 5 stars (44)
Included Components	Great Product
International Protection Rating	IP54
Item Dimensions	4.38 x 2.69 x 1.75 inches
Item Type Name	Great Product
Item Weight	1.28 ounces
Lower Temperature Rating	1 °C
Manufacturer	Blue Sea Systems
Material Type	Plastic
Model	7929
Mounting Type	Panel Mount
Number of Items	1
Number of Positions	1
Operating Voltage	24 volts
Operation Mode	ON-OFF
Part Number	7929-BSS
Specification Met	CE
Switch Type	SPST
Terminal	Spst
UPC	632085079291
Unit Count	1 Count
Upper Temperature Rating	85 °C
Warranty Description	Warranty
Wattage	240 watts

Contura II OFF-ON SPST Switch, Black

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