Contura SPDT Momentary Off-Momentary Switch

A "momentary Off momentary" switch has three positions: a central "Off" (stop) position and two active "On" positions on either side. These active positions are "momentary", meaning the switch automatically returns to the central "Off" position as soon as pressure is released. It does not maintain its activated position without user intervention.

SPDT stands for "Single Pole Double Throw". This means the switch has one input (one pole) and two outputs (two directions or "throws"). It allows you to connect a power source to either of two separate loads, or to switch between two different functions using a single source. In the case of a momentary Off momentary switch, it can temporarily activate one function or another.

This switch is suitable for marine applications requiring temporary activation in two directions or for two distinct functions. Common uses include controlling windlasses (up/down), bilge pumps (momentary on/off), horns, flaps or trim tabs (up/down), or other systems where the user must hold the switch for the function to remain active.

Yes, BLUE SEA Contura series switches are designed for demanding marine environments. They typically feature splash and spray protection, often rated IP66 on the front face, making them resistant to seawater and the damp conditions encountered aboard vessels.

The BLUE SEA Contura SPDT momentary Off momentary switch (reference 8234-BSS) is a standard toggle switch from the Contura series. It is typically black, with a textured surface for better grip. The product image provides an accurate visual representation of its appearance.

The BLUE SEA Contura 8234-BSS switch is typically sold separately, without a cover or pre-printed label. Covers with specific symbols or texts for different functions (windlass, horn, etc.) are often sold separately by BLUE SEA or other suppliers to allow customization based on the application.

The Contura series switches from BLUE SEA are made from robust UV-resistant thermoplastics, designed to withstand harsh marine environments, including sun exposure, saltwater, and temperature variations.

No, the BLUE SEA Contura 8234-BSS switch is a basic model and does not include an internal lighting function (LED). If a backlit switch is required, you will need to select a different Contura model specifically designed for this purpose, or use a compatible backlit switch cover if the switch body allows it.

The BLUE SEA Contura 8234-BSS switch uses the standard Contura switch format. The typical cutout required in the panel for installation is approximately 21.08 mm (0.83 inches) wide by 36.83 mm (1.45 inches) high. It is always recommended to verify the exact dimensions in the product datasheet before making the cutout.

This switch typically uses 6.35 mm (0.250 in) quick-connect terminals (faston). For a momentary SPDT configuration with momentary off, you will generally have one common input terminal for the power supply and two output terminals for the two momentary functions. It is crucial to refer to the wiring diagram provided by BLUE SEA Systems for model 8234-BSS to ensure correct and secure connections.

For installing this switch, you will generally need the following tools:

A drill with a suitable bit or a hole saw for cutting the panel. A cutting template (often supplied with the panels or available online). Crimping pliers for Faston connectors. 6.35 mm (0.250 inch) male Faston connectors. A screwdriver (if screw terminals are present, though less common on this type of Contura switch). A voltage tester or multimeter to check the wiring. Always ensure the power supply is turned off before any work.

Yes, Blue Sea Contura series switches are designed for simple snap-in mounting in a standard panel cutout. Once the cutout is made to the correct dimensions, the switch snaps firmly into place without requiring screws or additional tools for physical attachment to the panel.

Yes, although the switch itself can be inserted in any orientation in the cutout, it must be oriented correctly so that the symbols on the cap (if any) are readable and the "up" and "down" (or "forward" and "astern") functions match the intended action. The internal wiring must also follow the diagram to ensure momentary functions activate the correct outputs.

Yes, it is imperative to protect any electrical circuit with a fuse or circuit breaker rated for the load current. The switch itself does not provide protection against overcurrent or short circuits. The fuse or circuit breaker rating must be selected based on the maximum consumption of the device controlled by the switch, not the switch's capacity.

The BLUE SEA Contura 8234-BSS switch is designed for marine electrical systems and typically supports a maximum voltage of 12V DC or 24V DC. It is essential to check the product’s exact datasheet to confirm the specific nominal voltages, but these switches are commonly used within these voltage ranges.

The maximum current capacity for BLUE SEA Contura switches is typically 20 amperes at 12V DC and 15 amperes at 24V DC. It is critical not to exceed these values to avoid damaging the switch and compromising the circuit’s safety. Ensure the connected load does not exceed these specifications.

No, the BLUE SEA Contura 8234-BSS switch is specifically designed for direct current (DC) applications and low voltages typical of marine systems (12V or 24V DC). It is not compatible with 220V alternating current (AC) systems and must never be used for such applications, as this could pose serious electrical hazards.

Yes, this switch is suitable for controlling small electric motors that require momentary activation in two directions, such as windlass motors, bilge pump motors, or trim tab motors. However, it is crucial to ensure that the motor's maximum amperage does not exceed the switch's rated capacity (typically 20A at 12V DC or 15A at 24V DC) and to use a relay or contactor if the motor current is higher.

Yes, switch 8234-BSS is part of BLUE SEA Systems' Contura range. It is therefore compatible with the mounting brackets, interchangeable switch caps, and modular switch panels in the same Contura series, allowing for seamless aesthetic and functional integration with other BLUE SEA components.

No, this switch is of the "momentary Off momentary" type ((ON)-OFF-(ON)), meaning it automatically returns to the "Off" position as soon as pressure is released. It cannot replace a three-position maintained switch (ON-OFF-ON) that stays in the selected position without continuous user input. If a maintained position is required, a "maintained" type switch must be selected.