Stark Electronics - Minneapolis, MN
Distributor
Distributor of DIP, emergency stop and Ethernet switches. E-stop, toggle, push button, rocker, slide, membrane, tactile/tact, rotary, keylock, snap-action, sealed, foot, micro-signal, sensor, industrial, round, level, square illuminated, industrial stack, pendant nurse call cord, European line voltage selector, power toggle and push wheel switches are also available. JIT delivery.
electronicpartsandequipment.com/switches/

Turck, Inc. - Plymouth, MN
Manufacturer, Custom Manufacturer
Worldwide manufacturer & distributor of standard & custom network switches including Ethernet switches. Types include managed & unmanaged Ethernet switches. Unmanaged switches are available in 5 or 9-port configurations & managed switches are available in 9-port configurations & with one port used as RS-232 configuration port. Switches are used with 10/100 Base-T with twisted pair Ethernet cables.
www.turck-usa.com/Press_Room/index.htm

Comtrol - New Brighton, MN
Manufacturer
Manufacturer of switches. Products include industrial and power over ethernet switches.

Power/Mation - Saint Paul, MN
Distributor, Custom Manufacturer
Distributor of industrial Ethernet switches, gateways, & media converters. Specifications of Ethernet switches include digital input for state 1 ranging from 13 V to 30 V, & for state 0 is minus 30 V to 3 V, maximum input current is 8 mA & IEEE802.3x flow control. Features include gigabit Ethernet ring, 1 port gigabite modules, bandwidth management, digital input to integrate exception, panel mounting capability, & telnet/serial console. Meets IEEE802.3, 802.3u, 802.3x, 802.3D, 802.1W, 802.1Q, 802.1p, 802.1X, 802.3ad, 802.3z standards.
Brand Names: ABB, APEX, Ametek, Brad Harrison, Continental Industries/Eurotherm, Control Techniques, Control...

InterlinkBT is now Turck - Minneapolis, MN
Manufacturer, Custom Manufacturer
Manufacturer Of Components For All Open, Device-Level Fieldbuses, Including DeviceNet™, Profibus™ Foundation™ Fieldbus, AS-I™ Interbus™, Smart Distributed System™, Seriplex™, Beckhoff II/O™ Sensoplex® 2. Ethernet™. Stations, Junctions, Cordsets, Connectors, Connectorized Cable, Tees, Taps, Terminators, Hubs, Amplifiers, Splitters, Repeaters, Intrinsically-Safe Line Isolators, Bulk Cable & OEM Components For Device-Level Networks