Contura SPDT Momentary Off-Momentary Red/Green Switch

An SPDT (Single Pole Double Throw) momentary Off-momentary switch is a type of switch with one input and two outputs. It allows control of two separate circuits or provides a signal in two directions. The "momentary Off-momentary" function means the switch automatically returns to its central "Off" (stop) position as soon as you release the lever, whether it was pushed in one direction or the other.

This switch is ideal for marine applications requiring temporary and bidirectional control. It is commonly used to operate equipment such as:

Electric windlasses (for raising and lowering the anchor).Trim tabs (for adjusting the boat's trim).Actuators or pumps requiring activation in both directions.Its momentary nature ensures the equipment stops as soon as the lever is released.

The red/green colors on this Contura switch can indicate several things depending on the exact model and wiring:

They may refer to the lever illumination, changing color to indicate the activation direction (e.g., green for one direction, red for the other). They may also be visual markings on the lever itself to help identify functions or directions, even in low-light conditions. These colors help the user quickly identify the switch's state or the activated function.

Yes, BLUE SEA’s Contura switch series are specifically designed for marine environments. They are built with rugged materials and a design suited to withstand harsh conditions such as moisture, salt spray, vibration, and temperature fluctuations, ensuring increased reliability and durability aboard vessels.

Yes, the "red/green" mention in the description of the BLUE SEA Contura switch usually indicates that it has a backlighting function. The illumination can change color (red or green) depending on the currently activated position, providing a clear visual indication of the switch's state, especially useful in low light.

Installing this Contura switch in a marine dashboard typically requires a standard cutout.

Here are the general steps:

Cutout: Make a rectangular cutout in your dashboard panel to the standard Contura switch dimensions (check the manufacturer’s datasheet for exact dimensions of model 2145B-BSS). Insertion: Insert the switch into the cutout until it snaps firmly into place. Wiring: Connect the electrical wires to the appropriate terminals on the back of the switch according to your application’s wiring diagram (power, load, ground for lighting if applicable). Always consult a professional if you are unsure about the wiring process.

Switches, including this Contura model, have a specified maximum current rating (not provided here). If the equipment you wish to control (e.g., a powerful windlass) has a current draw exceeding the switch's rated capacity, it is imperative to use an external relay or solenoid. The switch would then control the relay, which in turn would handle the high current load, protecting both the switch and the circuit.

Yes, if your previous switch was also from the Contura series and used the same standard cutout format, this model should fit perfectly. Contura switches typically share similar mounting dimensions and case designs, making replacement and upgrades within the same series straightforward.

The Contura series switches from BLUE SEA typically use rear fast-on (spade terminals) quick-connect terminals. These terminals are designed for secure connections with corresponding female spade connectors, making wiring and disconnection easier when needed.

Although a detailed wiring diagram for specific applications is generally not included directly with the switch (as it depends on your installation), BLUE SEA switches are standard components. Generic wiring diagrams for SPDT momentary switches are widely available online or in marine electrical installation manuals to guide you in connecting the terminals.

Blue Sea switches are generally designed to be compatible with standard 12V DC and 24V DC marine electrical systems. However, it is critical to verify the maximum voltage and amperage specified for this particular model (2145B-BSS) to ensure it matches your system’s requirements and the load you intend to control. Without this specific information, we cannot confirm exact compatibility with both voltages simultaneously for all loads.

The primary function of a "momentary" switch is to activate a circuit or equipment only while the actuator (the lever or button) is held in its activated position. As soon as the actuator is released, the switch automatically returns to its rest position (often "Off" or a central position), thereby deactivating the circuit. This is ideal for functions that do not require continuous activation, such as the operation of a windlass or a trim tab.

BLUE SEA Systems Contura series products are made with marine-grade materials typically designed to withstand prolonged exposure to UV rays. This resistance helps prevent discoloration, cracking, or plastic degradation, ensuring the durability and aesthetics of the switch even after extended outdoor use.

This Contura series switch is designed to fit a standard rectangular cutout commonly found on marine dashboards. The exact dimensions of the cutout are typically specified in the manufacturer's technical documentation for model 2145B-BSS. It is recommended to refer to these specifications to ensure a perfect fit.

While technically possible, this SPDT momentary Off momentary switch is more specifically designed for applications requiring bidirectional and temporary control (such as a motor). For lighting, an SPST (Single Pole Single Throw) or SPDT (Single Pole Double Throw) latching switch (On-Off or On-Off-On) would generally be more suitable, as it would maintain the "On" position without needing to be held. However, if you have a very specific lighting application requiring momentary activation in both directions, it could be used.

The main difference lies in their behavior after activation:

A momentary switch (like this one) automatically returns to its resting position (often "Off") as soon as you release pressure on the lever or button. A latching switch (or "maintained") stays in the position you set until you manually change it. The choice depends on the application: momentary for temporary actions (windlass), latching for continuous functions (lights, bilge pump).

Yes, BLUE SEA's Contura series is a modular range. It is often possible to purchase separate custom actuator caps, mounting bezels, and other compatible accessories. These items allow you to customize the appearance or add specific functions to your switch, such as engraved symbols to identify its function.

The Contura series switches are generally designed to provide good water resistance when properly installed in a panel. Some models or kits may include a rear gasket or membrane to enhance protection against water splashes and humidity on the front of the panel. It is recommended to check the product sheet or installation manual for specific details regarding the 2145B-BSS model and whether it includes a gasket.

Marine-grade switches such as those from BLUE SEA Systems are designed for long service life, even under frequent use. While the exact number of operating cycles (mechanical and electrical) is not specified here, they are built to withstand thousands, even tens of thousands, of activations, ensuring long-term reliability for marine applications.

Yes, a SPDT (Single Pole Double Throw) switch is fundamentally capable of switching a connection between two distinct points, which can be used to reverse the polarity of a simple motor if the wiring is correctly configured with diodes or an appropriate H-bridge circuit. However, for motor reversal applications, it is often safer and simpler to use switches specifically designed for polarity reversal or dedicated motor controllers, especially for high loads. This switch is better suited for controlling a relay that will perform the reversal.