Popular Siemens E4242ML3400SCU Loadcenter 400A 42 Space

The SIEMENS E4242ML3400SCU is a main lug load center designed for residential and light commercial electrical distribution. This panel accepts up to 42 single-pole circuit breakers across 42 spaces and is rated for 400 amps, making it suitable for high-demand service installations. The enclosure provides a structured mounting surface for branch circuit breakers and is installed by licensed electricians as part of new construction or service upgrade work. Its main lug configuration means service conductors terminate at the lug block rather than a built-in main breaker, requiring an upstream disconnect.

This load center is used in residential and light commercial applications where a separate main disconnect is already installed upstream. Typical install scenarios include sub-panel configurations, service upgrades, and new construction electrical rough-in. The 42-space layout gives electricians room to distribute branch circuits for lighting, HVAC equipment, appliances, and general receptacle loads without requiring tandem breakers in most installations.

Key Features

• 400 amp rating supports high-demand residential and light commercial service
• 42 spaces and 42 circuits provide ample branch circuit capacity
• Main lug configuration requires upstream disconnect or main breaker panel
• Enclosure dimensions accommodate standard flush or surface mounting in electrical rooms and utility spaces
• UPC verified unit for supply house and distributor inventory tracking

Compatibility

Designed as an OEM-style load center for residential and light commercial electrical distribution systems requiring a 400 amp, 42-space main lug configuration.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local amendments. De-energize the upstream service conductors and verify absence of voltage before terminating any wiring at the lug block. Secure the enclosure to a structurally sound surface and ensure proper grounding and bonding per NEC Article 250. Do not exceed the panel ampacity rating when sizing service entrance conductors.

Technical Specifications

• Ampacity: 400 amps
• Spaces: 42
• Circuits: 42
• Configuration: Main Lug
• Length: 51.969 inches
• Width: 22.835 inches
• Height: 7.874 inches
• Weight: 96.408 pounds
• UPC: 78364333553

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: E4242ML3400SCU