4-terminal ON/OFF/ON switch – code: L0703004 – Trem

Trem 4-terminal ON/OFF/ON switch – code L0703004

The’Trem 4-terminal ON/OFF/ON switch (code L0703004) is a practical solution for managing two separate circuits in electrical systems, with a clear and immediate control. It is designed for typical applications in the nautical field and onboard systems, where the selection between two functions or two operating modes must be simple and recognizable even in low light conditions.

The model is made of polycarbonate and integrates a double LED on the button for differentiated light signaling between command positions. For installation, a rectangular hole from 21.5 x 36.8 mm. The packaging is without rocker.

Features and construction details

ON/OFF/ON operation for two circuits

The control logic ON – OFF – ON is indicated when you want to select function “A” or function “B”, maintaining a central exclusion position (OFF). In particular, this switch is described as ideal for 2 separate circuits, making it suitable for configurations where two loads or two modes must remain independent.

Connections: 4 terminals

The model has 4 terminals, a typical configuration for managing two separate lines/circuits with selection via lever/button. During wiring, it is advisable to check the system diagram and terminal assignment according to your application.

Double light signaling with 2 LEDs

The button is equipped with double LED for a dual differentiated illumination among the positions:

• in OFF a light remains on;
• in ON another indicator light lights up.

This solution helps to recognize the command status and quickly locate the switch on the panel.

Material: polycarbonate

The structure is described as manufactured in polycarbonate, a material commonly used for panel components due to its good robustness and ease of use in technical contexts.

Panel installation: rectangular hole

For mounting, a is required. rectangular hole from 21.5 x 36.8 mm. This data is useful both during the design phase of the panel and for replacing an existing command, to verify mechanical compatibility with the panel.

Package without rocker

The product is supplied in package without rocker. If you are replacing an already installed switch or completing a control panel, consider this aspect in the bill of materials.

Typical applications (nautical and onboard plant engineering)

According to the manufacturer's description, the ON/OFF/ON switch L0703004 is suitable for applications where two separate circuits. Common usage examples:

• Bilge pumps with selection between modes manual and automatic (separate circuit management);
• Running lights or configurations with two types of lights managed independently;
• Commands on electrical panels where a central OFF position and two ON positions dedicated to distinct functions are useful.

These applications are particularly common on boats and distribution panels where the operator must be able to quickly select the desired function.

Operational advantages

Clear management of two functions

The configuration ON/OFF/ON allows an intuitive selection between two operating states, with a central off position. It is a useful logic when you want to avoid ambiguity between “off” and “on” and when you want to keep two controls separate.

Differentiated light indication

The double LED on the button provides an immediate reading of the status, visually distinguishing the OFF condition from the ON. In a control panel with multiple users, this feature helps reduce operational errors and speeds up checks.

Neat panel installation

The requirement of the rectangular hole 21.5 x 36.8 mm facilitates panel preparation and makes replacement easier when working on already existing holes with compatible sizes.

Usage and installation notes

Preliminary wiring and function check

Before installation, it is good practice to:

• verify that the logic ON/OFF/ON is consistent with the intended use (selection between two separate circuits);
• correctly identify the 4 terminals according to your system's diagram;
• check the available space on the panel and the size of the rectangular hole 21.5 x 36.8 mm.

Integration on existing panels

In case of replacement, besides the hole dimensions, consider the presence of the double LED indication and the availability of the rocker (not included in the package). If your panel uses a specific rocker, it may be necessary to obtain it separately.

Usage context

This switch is designed for technical use in the field of nautical and onboard systems, where operational reliability and command readability are important aspects in the daily management of utilities.

Product code: L0703004
Brand: Trem
SKU: TREM0000165

FAQ – Frequently Asked Questions

What is a 4-terminal ON/OFF/ON switch like the L0703004 used for?

It is suitable for selecting between two separate circuits, with a central OFF position. It is useful when you want to manage two distinct functions from the same control.

Does this switch have integrated light signaling?

Yes. The button is equipped with a double LED for dual illumination: one indicator stays on in OFF and another lights up in ON.

What hole is needed to install the Trem L0703004 switch?

A rectangular hole of 21.5 x 36.8 mm is required for installation.

Is the rocker included in the package?

No, the product is indicated as supplied in packaging without toggle switch.

For which applications is it recommended?

It is described as ideal for two separate circuits, for example for manual/automatic selection of bilge pumps or to manage two types of navigation lights on onboard systems.