- Complies with EN50121-4 environmental requirement for railway applications
- Complies with NEMA TS1 & TS2 environmental requirements for traffic control equipment
- Complies with IEC61000-6-2 EMC generic standard immunity for industrial environment
- Proprietary " α-ring" support for network redundancy; recovery time <15ms
- IEEE802.1w RSTP, IEEE802.1S MSTP and IEEE802.1D STP compatible
- IP multicast filtering through IGMP Snooping V1, V2 & V3
- Supports port-based VLAN and IEEE802.1Q VLAN tagging and GVRP
- IEEE802.1p QoS with four priority queues
- MAC-based trunking with automatic link fail-over RS-232 console, Telnet, SSL/SSH, SNMP V1, V2c & RMON, Web browser, and TFTP management
- Supports command line interface in RS-232 console
- Supports IEEE802.1x security
- Bandwidth rate control
- Per-port programmable MAC address locking
- Up to 24 static secure MAC addresses per port
- Port mirroring
- 1000Mbps-full-duplex, 10/100Mbps-full/half-duplex, auto-negotiation, auto-MDI/MDIX
- Full wire-speed forwarding rate
- Redundant power inputs with terminal block and DC jack
- -40°C to +75°C (-40°F to +167°F) operating temperature range
- Hardened aluminum case
- Supports NTP
FUSE SIZING CONSIDERATIONS FOR HIGHER EFFICIENCY MOTORS
When selecting the proper fuse for short circuit protection in motor starting applications, it is important to not only ensure that the fuse will not nuisance open during motor start up times, but also that the fuse will coordinate as required with overload relays. When sizing fuses between 125% and 150% of the motor nameplate current, several advantages, including ease of coordination with an overload device, a smaller disconnect, and increased short circuit protection from a lower fuse rating, can be achieved. However, if sizing at this level prevents the motor from starting, it may then be necessary to increase the fuse ampere rating and it then becomes important to know the NEC sizing limitations. As of June 1, 2016, the US Department of Energy has mandated that newly manufactured electric motors will need to meet NEMA Premium® efficiency standards. As motor efficiencies increase, motor locked rotor currents can also be expected to increase. In addition to this, with across-the-lin...
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