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The 3SB3001-6BA40 is a pushbutton switch from Siemens. It is part of their 3SB3 series of miniature pushbutton switches. This model has a round, flush-mounted plastic housing and two contact blocks. It has illumination options, with an adjustable LED in white, red, green, or yellow. It can be used in either a momentary or alternate action configuration. Its contact blocks have both normally open (NO) and normally closed (NC) contacts, with a make contact rating of 16A/250VAC. This switch has a high level of IP67 protection and is perfect for use in tough environments.