Switchboards can be custom designed or utilize a standard configuration to meet specific dimensional and electrical requirements.   They can include fully integrated component options from leading manufacturers, including automatic transfer switches, TVSS, distribution transformers, and PLC or relay based transfer schemes.  Circuit breakers and fusible switches can be group or individually mounted.  Indoor and outdoor enclosures are available in a wide range of durable color finishes.


  • Voltage: Up to 600V maximum
  • Ampacity: 400A to 12000A maximum bus rating
  • 65 kAIC standard bus bracing (100 or 200kAIC – optional)
  • Switchboard ratings through 12000A, 200kAIC up to 480V, 100kAIC up to 600V
  • Type 1 or 3R NEMA enclosures
  • Front, rear, and side accessibility
  • Devices can be individually (vertically) or group (panel/horizontally) mounted
  • Extensive protective device accessories available
  • Silver-plated copper bus, tin-plated copper bus or tin-plated aluminum bus
  • 1000A per sq in fully rated copper bus systems
  • 750A per sq in fully rated aluminum bus systems
  • Tested to short circuit rating of 3 cycles (.05 seconds) or to immediate trip of tested OCPD or braced to UL configuration standards
  • Variety of fully integrated component options available including automatic transfer switches, metering, TVSS, distribution transformers, and PLC or relay based transfer schemes.
  • Front accessible line connections for main device
  • Front accessible load connections for feeder devices
  • Switchboard fed by cables, cable bus, bus duct, or transformer
  • Custom sheet metal and bus flexibility for busway and transformer connections
  • Thermal-magnetic, electronic fixed mounted circuit breaker mains and feeders, Fix-mounted fusible switch mains and feeders or combination of fixed mounted breakers and fusible switches
  • Rigid frame construction isolating bus and breaker assemblies from enclosure
  • Main and branch devices in single section configurations
  • Metering compartments built to applicable utility’s standards
  • Thermal magnetic, electronic circuit breakers with standard, high kAIC or current limiting capability, 80% or 100% rated
  • All commercially available options on circuit breakers and fusible switches
  • ANSI 61 light gray standard finish, other colors available as option


Product Data Sheet

Technical Specifications

  • IEM Switchboards meet or exceed applicable industry standards, including UL891, NEMA standards PB-2, NEMA 1 and NEMA 3R enclosures. Uses UL489 or UL1066 listed breakers
  • IEM Switchboards meet seismic testing, circuit requirements as outlined by IEEE344 and ICC-ES-AC156.