C521A DPST Rocker Toggle Switch — ON-ON 4-Pin 2-Position 250V 15A Maintained

Measure your existing panel cutout or the opening in your enclosure before ordering. This rocker toggle switch typically requires a rectangular cutout of approximately 19mm × 13mm (≈3/4" × 1/2"). If you're replacing an existing switch, the easiest method is to measure the old switch body or the cutout directly. When in doubt, contact us with your measurements to confirm compatibility.

This switch is rated at 250V AC / 15A for resistive loads. To check if it suits your circuit, divide your device's wattage by the voltage — for example, a 2,000W / 250V load draws 8A, well within the 15A rating. For inductive loads (motors, solenoids, transformers), it's generally advisable to derate by 20–30% to account for inrush current. Always verify your actual circuit draw before installation.

This switch is designed for indoor panel and enclosure use. It is not rated for direct outdoor exposure, rain, or submersion. If your application involves moisture or dust ingress, you'll typically need a switch with an IP65 or higher rating, along with a protective rubber boot or sealed cover. Contact us if you need guidance on moisture-resistant alternatives.

DPST (Double Pole Single Throw) means the switch controls two separate circuits at the same time using one actuator, but each circuit only has one throw direction. In this ON-ON configuration, Position 1 connects both circuits one way, and Position 2 reconnects them the other way — there is no center-off state. SPST controls a single circuit; DPDT controls two circuits with two throw directions and often includes a center-off option. Choose DPST when you need to switch two circuits in sync without an off position.

The 4 pins on this switch generally accept 4.8mm (3/16") quick-connect spade terminals, which are widely available at hardware and electronics stores. Alternatively, the pins can be soldered directly for a more permanent connection. Confirm the pin spacing and terminal size with your connector supplier before crimping, especially if you're using pre-made wiring harnesses.

A maintained (latching) switch stays in its last position after you release it — flip it to ON and it stays ON until you flip it back. This switch is maintained. A momentary switch only activates while you hold it and springs back when released. Use maintained switches for persistent states like power on/off or mode selection; use momentary switches for brief signal pulses like reset buttons or doorbells.

Many AC-rated rocker toggle switches can handle DC as well, but DC ratings are typically lower than AC ratings because DC arcs are harder to extinguish. This switch is rated at 250V AC / 15A. For DC applications, contact us to confirm the specific DC voltage and current limits before installation to avoid premature contact wear or failure.