1. Basic Overview

• Model: E-TEN1121 (sometimes labeled E-TEN 1121)

• Switch Type: Toggle Switch

• Actuation: Toggle lever (with or without a colored cap/cover, commonly orange in many listings)

• Switching Function: ON–ON (maintained positions)

• Circuit Type: SPDT (Single Pole, Double Throw)

• Number of Terminals: 3

2. Electrical Specifications

• Rated Voltage:

  • Up to 250 VAC (commonly also rated for 125 VAC use)

• Rated Current:

  • 15 A at 250 VAC

  • (Occasionally also noted as 20 A at 125 VAC in some datasheets)

• Contact Resistance: Typically ≤ 50 mΩ (initial)

• Insulation Resistance: Typically ≥ 100 MΩ at 500 VDC

• Dielectric Strength: Typically 1500 VAC for 1 minute between terminals and metal parts/ground

3. Mechanical Specifications

1. Operation Type:

   • Maintained ON–ON. That means the toggle has two stable positions and remains in whichever position is selected.

2. Actuator (Toggle Lever):

   • Usually a short metal toggle lever (silver)

   • An optional colored tip or boot (commonly orange) may be present for easier identification or to seal against dust/moisture.

3. Terminal Type:

   • 3 quick-connect/solder lugs (often 6.3 mm / 0.25 inch wide spade terminals)

   • Center terminal is common (C), the outer terminals are typically Terminal 1 (T1) and Terminal 2 (T2).

4. Mounting Method:

   • Panel mount toggle switch

   • Requires a mounting hole (commonly 12 mm diameter, sometimes listed as 12.2 mm)

   • Secured with a threaded bushing and nut.

5. Switch Body Material:

   • Typically a phenolic or bakelite-like plastic housing with metal bushing.

6. Toggle Handle Material:

   • Metal (often nickel-plated brass or stainless steel).

7. Hardware Included:

   • Mounting nut

   • Locking or dress washer (depending on supplier)

4. Dimensional Details (Approximate)

• Mounting Hole Diameter: ~12 mm (sometimes 12.2 mm)

• Thread Length / Bushing Length: ~9-10 mm (varies by supplier)

• Toggle Lever Length Above Panel: ~17-20 mm (varies slightly)

• Overall Body Dimensions: ~30 mm × 20 mm × 18 mm (body can vary slightly)

• Terminal Spacing: Terminals are ~6.3 mm wide spades spaced to accommodate standard quick-connect terminals

(Always check exact datasheet or measure the specific switch you have for precise panel cutout and mechanical fit.)

5. Operation Logic (ON–ON)

Being an SPDT ON–ON switch, the three terminals function as follows:

• Common (C): The middle (center) terminal.

• Terminal 1 (T1): One side position is connected when toggle is in the first ON position.

• Terminal 2 (T2): The other side position is connected when toggle is in the second ON position.

In effect:

• When the toggle is flipped to one side (Position A), Common is connected to Terminal 1.

• When the toggle is flipped to the other side (Position B), Common is connected to Terminal 2.

There is no “OFF” in this configuration; one of the two outer terminals will always be connected to the center terminal.

6. Typical Applications

1. Power Switching: Used in AC mains applications up to 15 A / 250 VAC for devices, lights, or motors where you need to switch between two circuits or lines.

2. Selecting Modes: Because it is an ON–ON SPDT, it can be used to select between two different power lines or signals.

3. Automotive / Marine: Often used for accessory switching (e.g., lights, fans, pumps) in vehicles or boats (with attention to voltage/current ratings).

4. Equipment Control: Common in industrial controls or consumer appliances where a sturdy, high-current toggle is needed.

7. Additional Characteristics

• Mechanical Life: Often rated at 50,000 toggle cycles or more under normal operating conditions.

• Operating Temperature Range: Typically –25 °C to +85 °C (exact range may vary by manufacturer).

• Contact Material: Usually silver alloy (Ag) or silver-plated copper for higher conductivity.

• Actuator Color: The switch body is typically black or dark brown (phenolic), while the toggle lever is metallic silver. Some suppliers add a colored toggle cover or “bat” handle which can be orange, red, black, etc.