● Improved the noise immunity with dedicated IC
● Built-in reverse polarity protection circuit
(DC 3-wire type)
● Built-in surge protection circuit
● Built-in over-current protection circuit (DC type)
● Long life cycle and high reliability, and simple operation
● IP67 protection structure (IEC standard)
● Replaceable for micro switches and limit switches

More details:
http://autonics.com.my/products/products_detail.php?catecode=01/01/02&db_uid=7