Panelboards Available to Ship in as few as 5 Days

Finish your job faster with Siemens panelboards assembled by OneSource. With select parts warehoused in Southern California and Hawaii, your order can be ready to ship in as few as five business days. Our skilled team will help select the parts based on available inventory, and then assemble and carefully package your panelboard for delivery. Fill out the form below for your free quote.

Learn about P1 Panelboard Assembly.

Learn about P5 Panelboard Assembly.



Watch our Panelboard Assembly Video




Available to You for Fast Delivery

Our expedited service qualifies for the following specifications:

P1 Panelboards

    • 480/277V 3 phase, 4 wire
    • 208/120V 3 phase, 4 wire
    • 120/240V 3 Phase, 4 wire
    • 18, 30, 42, and 54 circuits
    • Up to 400A max configuration
    • Main Lug or Main Breaker available
    • Aluminum or Copper bussing
    • One sub-feed circuit breaker up to 250A
    • Surface or Flush mounting
    • System interrupting rating of up to 65,000 AIC
    • Maximum branch breaker of 100A/li>
    • Surge Protection Devices*
    • GFCI & Handle Blocking Devices*
P5 Panelboards

  • 480/277V 3 phase, 4 wire
  • 208/120V 3 phase, 4 wire
  • NEMA1 or NEMA3R
  • Main Lug or Main Breaker available
  • Main Lug up to 1200A
  • Main Breaker up to 1000A
  • Copper Bussing at 1000A per sq. in.
  • Service Entrance Rated Available
  • Bus Space up to 60in.
  • System Interrupting Rating of up to 65,000 AIC
  • Surge Protection Devices*
  • Handle Blocking Devices*


*Panelboard lead times are subject to product availability. Prior to energizing the customer is responsible for final inspection. For additional questions contact OneSource Panelboard Specialist Team at [email protected].

Siemens - request a panelboard quote