Siemens P1X54MC400CT 400A 3-phase Load Center 54-space

Product Description

The SIEMENS P1X54MC400CT is a 400-amp, 3-phase, 4-wire underground-feed main circuit breaker load center designed for commercial and residential power distribution applications. Rated at 400A, this panel is built to handle high-capacity electrical loads across a 54-space configuration, making it suitable for larger service entrance installations. The unit ships as a single pack and is installed by licensed electricians during new construction or service upgrade projects where underground utility feed is required.

This load center is designed for underground power feed (UPB) configurations in 3-phase, 4-wire electrical services. The 54-space capacity accommodates a large number of branch circuits, supporting multi-tenant residential buildings, light commercial facilities, and similar applications that require substantial circuit distribution. Its main circuit breaker configuration provides overcurrent protection at the service entrance level.

Key Features

• 400-amp main circuit breaker rating for high-capacity service entrance installations
• 54-space panel accommodates a large number of branch circuit breakers
• 3-phase, 4-wire (3P4W) configuration for commercial and multi-family residential use
• Underground feed (UPB) design for below-grade utility service entry
• Single-pack unit sized for direct installation at the service entrance

Compatibility

Designed as an OEM-style load center for 3-phase, 4-wire underground-feed service entrance applications requiring a 400A main breaker and 54-space branch circuit capacity.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Ensure utility power is de-energized and the service entrance is fully isolated before beginning any wiring work. The enclosure dimensions should be verified against the available rough-in space prior to mounting, given the unit measures approximately 68.898 inches x 15.748 inches x 7.480 inches. Do not energize the panel until all wiring connections have been inspected and torqued per the terminal manufacturer labels inside the enclosure.

Technical Specifications

• Amperage Rating: 400 amps
• Phase Configuration: 3-phase, 4-wire (3P4W)
• Feed Type: Underground (UPB)
• Number of Spaces: 54
• Length: 68.898 inches
• Width: 15.748 inches
• Height: 7.480 inches
• Weight: 47.091 pounds
• Pack Quantity: 1
• UPC: 88762166350

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: P1X54MC400CT