Toggle Switch Heavy Duty ON-OFF ON-ON ON-OFF-ON – MTS E-TEN PS DS438 Series 125VAC 250VAC

MTS series (5–6A, 125VAC, solder pins) suits low-voltage DC and light AC panel work — common in model railway panels and electronics enclosures. E-TEN series (15A, 250VAC, solder pins) handles heavier AC loads such as power tool switches and appliance wiring. PS series are momentary push-style toggles for signal or relay triggering. DS438 series (16A, 250VAC, spade terminals) are designed for quick-connect wiring in automotive dashboards and appliance panels where soldering is impractical.

A latching switch stays in the position you move it to — ON stays ON until you flip it back. A momentary switch (labeled "Momentary" in the variant name) springs back to its default position when you release the lever. Use latching for sustained power connections and momentary for pulse-trigger actions like horns, relays, or test circuits. Confirming your requirement before ordering is important, as these variants look similar but behave differently.

MTS and E-TEN series toggle switches typically require a panel mounting hole of approximately 6mm (≈1/4") in diameter. The threaded bushing passes through the hole and is secured with the included nut from the rear. Always verify the bushing diameter of the specific variant you select before drilling — panel thickness can also affect how much thread is available for the nut.

E-TEN series switches are rated at 15A 250VAC, which generally covers standard 120V/240V AC circuits. However, for permanent household electrical installations, local electrical codes in the US typically require UL-listed components. These switches are generally suited for equipment panels, workbench setups, and DIY enclosures rather than in-wall residential wiring. Always consult local codes and a qualified electrician for permanent AC installations.

The switches themselves are not rated for direct outdoor exposure or submersion. However, this listing includes optional waterproof rubber boot covers in 6mm and 12mm sizes that slip over the toggle lever to protect against dust and moisture splash. For fully sealed outdoor use, pair the switch with an appropriate weatherproof enclosure. Marine console use in a protected cabin is generally acceptable.

A 2-pin switch is SPST — one circuit, simple on/off. A 3-pin switch is SPDT — one common terminal and two switched outputs, used for ON-ON or ON-OFF-ON routing. A 4-pin switch is DPST — two independent circuits switched together. A 6-pin switch is DPDT — two independent circuits each with two switched outputs, commonly used for motor direction reversal or dual-circuit control. Wiring diagrams for SPST, SPDT, DPST, and DPDT configurations are widely available online.

DS438 series switches use spade (quick-connect) terminals rather than solder lugs. Available in 4.8mm (≈3/16") and 6.3mm (≈1/4") tab widths, they accept standard push-on spade connectors, making them faster to wire in automotive dashboards, appliance panels, and equipment enclosures without soldering. Match the spade size to your existing wire harness connectors.

Order 1–2 pcs for a single repair or prototype. Choose 5 or 10 pcs if you are wiring a full control panel or building multiple units. The 20-piece option offers the lowest per-unit cost and is suited for production runs or stocking a workshop. All pack sizes ship the same switch type — only the quantity differs.