Features: 1) Self-cleaning function 2) Convenient to install 3) Pair of contacts (one open, one closed) 4) Contacts available in different states as per clients\'\' requests 5) Mechanical lifespan: 5 x 104 times 6) AC electrical lifespan: 120 x 104 times 7) DC electrical lifespan: 60 x 104 times border=0>