Mmtc, PBS-3, Nema 1 Three Push Button Switch Interior Surface Mount Control Station "OPEN - CLOSE - STOP". Momentary Contact, OPEN - CLOSE - STOP H 5-5/16"" W 2-3/8"" D 1-13/16"" with Metal Housing. This Three Button Commercial Garage Door Opener Station (PBS-3) features a convenient three-button style that operates the open, close and stop commands on your commercial garage door opener or gate opener. The momentary contact, low-voltage switch is housed within a durable metal enclosure that's NEMA 1 rated for safety. Commercial push button control stations are used to operate gate openers and garage doors from a distance. The PBS-3 Garage Door Openers are simple to install on single or multiple gates and garage doors. The wire is run to the open/close relay on your garage door opener or gate operator.