Toggle Switch SPDT - (ON)-OFF-(ON)

The Toggle Switch SPDT - (ON)-OFF-(ON) provides momentary three-position control for marine electrical applications. With momentary ON positions on both sides of a center OFF position, it is commonly used as a labeled dimmer control.

This single-pole, double-throw switch uses three quick-connect terminals and is designed to provide momentary control of two circuit paths. The parentheses around both ON positions indicate that each ON position is momentary and returns to OFF when released.

Maintained vs. Momentary Switches

• Maintained: Stays in the selected "On" or "Off" position until you flip it back.
• Momentary (indicated by parentheses like (On)): Returns to its default position via a spring as soon as you let go; used for temporary actions like horns or starter buttons.

Common Configurations

• SPST (Single Pole, Single Throw): A simple two-terminal switch used to control one circuit.
• SPDT (Single Pole, Double Throw): A three-terminal switch that can select between two different circuit paths or accessories.
• On/Off/On: A three-position switch with two ON positions and a center OFF position.

Momentary Three-Position Control

The (ON)-OFF-(ON) configuration provides momentary activation in either direction. Both ON positions are momentary, while the center position is OFF. Blue Sea Systems identifies this configuration for labeled dimmer applications.

Designed for Labeled Dimmer Applications

This SPDT momentary switch is commonly used as a labeled dimmer control, where one momentary direction can provide one control input and the opposite direction can provide another. For dimming systems that require a dedicated dimmer controller, compatibility with the specific control system should be confirmed before installation. Blue Sea Systems lists this switch configuration for use with its dimmer systems.

Specifications

Quick-Connect Terminals

The switch features three 0.25-inch (6.35 mm) quick-connect tab terminals for straightforward connection to compatible wiring. The three-terminal arrangement corresponds to its SPDT configuration.

Electrical Ratings

The switch is rated for up to 15A at 12V DC and 125V AC, and up to 10A at 250V AC. Maximum amperage ratings depend on using appropriately sized fuses and wire for the specific application.

Momentary Operation

Unlike a maintained ON-OFF-ON switch, this model returns to the center OFF position after the toggle is released from either ON direction. This makes it appropriate for applications where the control input needs to be activated only while the switch is being held.