---
product_id: 226046259
title: "Contura II OFF-ON SPST Switch, Black"
brand: "brand: blue sea systems"
price: "¥6496"
currency: JPY
in_stock: true
url: https://www.desertcart.jp/products/226046259-contura-ii-off-on-spst-switch-black
store_origin: JP
region: Japan
---

# Contura II OFF-ON SPST Switch, Black

**Brand:** brand: blue sea systems
**Price:** ¥6496
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Contura II OFF-ON SPST Switch, Black by brand: blue sea systems
- **How much does it cost?** ¥6496 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/226046259-contura-ii-off-on-spst-switch-black)

## Best For

- brand: blue sea systems enthusiasts

## Why This Product

- Trusted brand: blue sea systems brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Blue Sea SystemsContura II OFF-ON SPST Switch, Black

## Features

- Position to Light LED: ON, Pole Throw: Single Pole Single Throw, Action ( ) = momentary: OFF-ON, Number of LEDS: 1
- Max. Operating Current: 20A @ 12V DC, 15A @ 24V DC
- CE Marked, Meets UL 1500 and ISO 8846 external ignition protection requirements
- Vibration, shock, thermoshock, moisture and salt spray resistant
- Mounts in Blue Sea Systems Contura Water Resistant Panels and Contura Switch Mounting Panels

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Operation Mode | ON OFF |
| Current Rating | 20 Amps |
| Operating Voltage | 24 Volts |
| Contact Type | Normally Open |
| Brand | Blue Sea Systems |
| Terminal | SPST |
| Item dimensions L x W x H | 4.38 x 2.69 x 1.75 inches |
| Circuit Type | 1-way |
| Actuator Type | Rocker |
| Contact Material | Phosphor Bronze |
| International Protection Rating | IP54 |
| Number of Positions | 1 |
| Upper Temperature Rating | 85 Degrees Celsius |
| Controller Type | Manual Switch |
| Control Method | Touch |
| Connectivity Protocol | X-10 |
| Color | Black |
| Wattage | 240 watts |
| Number of Items | 1 |
| Manufacturer | Blue Sea Systems |
| UPC | 632085079291 |
| Item Package Dimensions L x W x H | 3.82 x 2.6 x 1.77 inches |
| Package Weight | 0.05 Kilograms |
| Item Dimensions  LxWxH | 4.38 x 2.69 x 1.75 inches |
| Item Weight | 0.08 Pounds |
| Brand Name | Blue Sea Systems |
| Warranty Description | Warranty |
| Model Name | 7929 |
| Suggested Users | unisex-adult |
| Part Number | 7929-BSS |
| Style | Spst, Off-on |
| Included Components | Great Product |
| Size | One Size |

## Product Details

- **Operation Mode:** ON OFF
- **Current Rating:** 20 Amps
- **Operating Voltage:** 24 Volts
- **Contact Type:** Normally Open
- **Brand:** Blue Sea Systems
- **Terminal:** SPST
- **Item dimensions L x W x H:** 4.38 x 2.69 x 1.75 inches
- **Circuit Type:** 1-way
- **Actuator Type:** Rocker
- **Contact Material:** Phosphor Bronze

## Images

![Contura II OFF-ON SPST Switch, Black - Image 1](https://m.media-amazon.com/images/I/812NjvnbKCL.jpg)

## Questions & Answers

**Q: Are these all momentary switches?  need spst black contura ii switch w/illuminated red not momentary,**
A: 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).

**Q: what are the exact opening dimensions needed for this product to fit in a pannel?**
A: Per the Blue Sea Systems Website the cutout dimensions are: 0.83" Wide by 1.45" tall or 21mm x 37mm.

**Q: 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.**
A: 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.

**Q: spdt, on-off-on, how many pins are in the back?**
A: 6

## Frequently Bought Together

- Blue Sea Systems Water Resistant Black Contoura II Switches
- Blue Sea Systems Contura Mounting Bracket
- Blue Sea Systems Water Resistant Black & Gray Contoura III Switches

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-27*