The DAR70510FU is a N/C (Normally Closed) sealed door contact manufactured by Sensata Technologies. It is designed to detect the opening and closing of doors and windows and send an electrical signal indicating the change in status. It is commonly used in alarm systems and other security applications. The contact has a PVC or PBT body and is dust, moisture, and oil-resistant for reliable operation in harsh environments. The contact is available in two versions: a standard gold-plated contact and a heavy-duty gold-plated contact. The heavy-duty version is suitable for longer service life and higher current/voltage ratings. Additionally, the contact includes a durable epoxy-filled terminal block that helps protect it from vibration and shock.