Description
Blue Sea 7939 DPDT Contura II Switch | Boat Supply Store
For critical electrical switching in demanding marine environments, the Blue Sea 7939 Contura II offers robust, sealed construction rated for operation between -40°C and 85°C. This Double Pole, Double Throw (DPDT) ON-ON switch provides reliable control with a 20A @ 12V rating, ensuring dependable performance in harsh conditions often encountered on saltwater fishing vessels in the Gulf of Mexico. Integrated dual LEDs offer immediate status indication, crucial for maintaining system awareness and operational safety.
Key Features
- Reliable DPDT (Double Pole, Double Throw) configuration for complex circuit control.
- Durable Contura II black actuator engineered for marine resilience.
- Environmental Resistance built to withstand vibration, shock, thermoshock, moisture, and salt spray.
- Sealed Design features both internal and external gasket panel sealing for superior ingress protection.
- Clear Indication dual embedded LEDs offer 100,000-hour rated visual status feedback.
- High Amperage rated for 20A at 12V and 15A at 24V for substantial load handling.
- Wide Operating Range functional across extreme temperatures from -40°C to 85°C.
- Marine-Grade Construction from Blue Sea Systems ensures longevity in saltwater applications.
Specifications
| Product Specifications | |
|---|---|
| Type | Contura II Switch |
| Configuration | DPDT ON-ON |
| Actuator Color | Black |
| Amperage Rating | 20A @ 12V / 15A @ 24V |
| Operating Temperature | -40°C to 85°C |
| LEDs | Dual Embedded |
| Panel Seal | Internal and external gasket |
| Environmental Resistance | Vibration, shock, thermoshock, moisture, salt spray |
Who This Is For
Ideal for marine electricians and boat owners installing or upgrading electrical systems requiring dual-throw switching capabilities. This switch is engineered for demanding applications where reliability and environmental resistance are paramount.
How It Compares
| Feature | Blue Sea 7939 DPDT Contura II Switch | Carling Technologies V |
|---|---|---|
| Actuator Style | Contura II Paddle | Rocker |
| Pole/Throw | DPDT | DPDT |
| Integrated LEDs | Dual Embedded LEDs | Optional/Not Standard |
| Sealing | Internal and external gasket panel seal | IP67 rated |
| Maximum Amperage @ 12V | 20A | 20A |
Common Concerns Answered
Is this switch worth the higher price compared to standard switches?
The Blue Sea 7939 Contura II's premium price reflects its marine-grade construction, superior environmental resistance (vibration, salt spray, moisture), and integrated dual LEDs, offering significantly longer service life and reliability in harsh marine conditions compared to non-marine grade alternatives.
I have a specific panel layout, will this switch fit?
The Contura II actuator style is a paddle design. While effective for many applications, if your panel design strictly requires a rocker actuator, alternative switches like the Carling V-Series or Cole Hersee M-550-01-BP might be considered, though they may lack integrated LEDs or specific sealing features.
How durable is the LED indicator on this switch?
The embedded dual LEDs on the Blue Sea 7939 Contura II switch are rated for an exceptionally long lifespan of 100,000 hours, providing reliable visual status indication for years of service in demanding marine environments.
Frequently Asked Questions
What is the amperage rating of the Blue Sea 7939 Contura II Switch?
The Blue Sea 7939 Contura II switch is rated for 20A at 12V DC and 15A at 24V DC.
What does DPDT mean for this switch?
DPDT stands for Double Pole, Double Throw. This configuration allows you to switch two separate circuits simultaneously with two different connection possibilities for each circuit.
Is this switch waterproof or water-resistant?
This switch features an internal and external gasket panel seal, making it highly water-resistant and capable of withstanding harsh marine conditions including moisture and salt spray.
What is the operating temperature range for this switch?
The Blue Sea 7939 Contura II switch is designed to operate reliably in extreme temperatures, with an operating range of -40°C to 85°C (-40°F to 185°F).
What are common applications for the Blue Sea 7939 switch?
Common applications include switching between two different power sources, controlling dual bilge pumps, managing navigation lights and anchor lights, or switching between a shore power feed and an inverter feed, particularly useful for systems involving shunts or current transformers with a single meter.
