The 637H is a family of push-button switches manufactured by Apem. They are designed for a wide range of applications, such as industrial control and audio equipment, and are available in either momentary action or latching configurations. The switch bodies are available in a range of colors, shapes, and sizes. The push-button actuators are illuminated or non-illuminated, come in a variety of colors, and can feature logos or legends. The contact ratings range from 5 to 250 VAC and all models carry UL, cUL, or ENEC approvals. The 637H series can be mounted in panel depths up to 15mm, and all models are rated IP65 or IP66.