When sourcing push button switches, technical reliability is paramount. You must prioritize Ingress Protection (IP) ratings, such as IP65 or IP67, to ensure dust and water resistance, especially for industrial or outdoor use. Additionally, verify the mechanical life (cycles), where high-quality switches should exceed 100,000 to 1,000,000 operations. For electrical safety, ensure the contact material is silver alloy to provide superior conductivity and prevent oxidation. Always confirm the rated voltage and current align with your specific application to avoid circuit failure.