The **7203T1CWCME** is a specific part number for a sub-miniature toggle switch manufactured by **C&K** (now part of Littelfuse). This component is designed for high-reliability applications, featuring environmental sealing and specific terminal plating. --- ### 1. Part Number Breakdown The nomenclature of this part number defines its physical and electrical characteristics: | Code | Category | Description | | :--- | :--- | :--- | | **7203** | Series/Model | **DPDT** (Double Pole, Double Throw) with **On-Off-On** functionality. | | **T1** | Actuator | Standard T1 style toggle (approx. 0.487" height). | | **CW** | Bushing | Threaded bushing, 0.350" high, with an internal O-ring seal. | | **C** | Terminations | PC Thru-hole / Solder tail terminals. | | **M** | Contact Material | **Gold over Silver** (suitable for low-level or power switching). | | **E** | Seal | Epoxy terminal seal (prevents contamination during soldering). | --- ### 2. Technical Specifications Below are the primary electrical and mechanical ratings for this component: * **Contact Rating:** * *With Silver plating:* 5 Amps @ 120 VAC or 28 VDC. * *With Gold plating:* 0.4 VA max @ 20 V AC/DC (Low level). * **Electrical Life:** 40,000 make-and-break cycles at full load. * **Contact Resistance:** Below 10 mΩ typ. initial @ 2-4 VDC, 100 mA. * **Insulation Resistance:** $10^9$ Ω min. * **Dielectric Strength:** 1,000 Vrms min. @ sea level. * **Operating Temperature:** -30°C to +85°C. --- ### 3. Key Features * **Environmental Sealing:** The "CW" designation includes an internal O-ring, making the switch splash-proof and resistant to dust/moisture ingress from the front panel. * **Epoxy Seal:** The "E" at the end of the part number indicates the base of the terminals is sealed with epoxy, preventing flux or solder from entering the switch housing during PCB assembly. * **DPDT Logic:** This switch controls two separate circuits simultaneously. With an **On-Off-On** configuration, the center position is a stable "Off," disconnecting both circuits. --- ### 4. Typical Applications * **Telecommunications:** Network equipment and interfaces. * **Instrumentation:** Test and measurement devices. * **Medical Equipment:** Control panels for diagnostic tools. * **Industrial Controls:** Heavy-duty panels requiring sealed components.