Schneider Electric QO342MQ225RB 225A 42 Space Load Center

Product Description

The Schneider Electric QO342MQ225RB is a three-phase convertible main breaker load center rated at 225 amperes with 42 circuit spaces. It accepts voltage configurations of 208 VAC Star/120 VAC, 240/120 VAC Delta (3 Phase 4 Wire), and 240 VAC Delta (3 Phase 3 Wire). The enclosure is NEMA 3R rainproof, making it suitable for outdoor installations. Bus construction uses tin-plated copper for reliable conductivity and corrosion resistance. The main breaker is a bolt-on QDL type with a 25 kiloampere interrupting rating. Licensed electricians install this panel in residential, commercial, and industrial service entrance applications where three-phase power distribution is required.

This load center is designed for three-phase electrical distribution systems in both indoor and outdoor settings. The convertible main configuration allows top or bottom feed by rotating the panel 180 degrees, giving installers flexibility to adapt to varying job site conduit entry requirements. The split branch neutral design keeps wiring organized and reduces clutter inside the enclosure. Main wire accepts conductors from 4 AWG to 300 KCMIL in both aluminum and copper. The NEMA 3R rating supports exposed outdoor installations where rain protection is needed. This panel is appropriate for light commercial, industrial, and multi-family residential applications requiring 42 circuits of three-phase branch circuit capacity.

Key Features

• 225A convertible main breaker with bolt-on QDL breaker mounting and 25 kA interrupting rating
• 42 maximum circuit spaces with 3 Phase 3/4 Wire configuration
• Tin-plated copper bus for enhanced conductivity and corrosion resistance
• NEMA 3R rainproof enclosure rated for outdoor use
• Split branch neutral for organized, clutter-free wiring
• Top or bottom feed flexibility via 180-degree panel rotation
• Accepts 4 AWG to 300 KCMIL aluminum or copper main conductors
• UL Listed and NOM approved; manual and automatic transfer switch capable

Compatibility

Designed for use with Square D QO series bolt-on circuit breakers. Compatible with QDL main breaker type. Accepts QO branch circuit breakers in a three-phase, 42-space configuration. Verify local code requirements and confirm breaker series compatibility before installation.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Disconnect and lock out all upstream power sources before servicing or wiring this panel. Verify that conductor sizes, breaker ratings, and conduit entries are matched to the supply circuit and load calculations. The NEMA 3R outdoor enclosure requires appropriate weatherproof conduit fittings at all knockouts to maintain the rated enclosure integrity.

Technical Specifications

• Current Rating: 225 amps
• Voltage Rating: 208 VAC Star/120 VAC, 240/120 VAC Delta (3 Phase 4 Wire), 240 VAC Delta (3 Phase 3 Wire)
• Circuit Configuration: 3 Phase 3/4 Wire
• Maximum Number of Circuits: 42
• Maximum Number of Spaces: 42
• Main Breaker Type: QDL
• Breaker Mounting: Bolt-On
• Interrupting Rating: 25 kiloampere
• Neutral Type: Split Branch
• Bus Material: Tin Plated Copper
• Main Wire Size: 4 AWG to 300 KCMIL (Aluminum/Copper)
• Enclosure Type: NEMA 3R, Rainproof
• Enclosure Size Designation: 14R
• Panel Dimensions: 14.75 inches W x 4.52 inches D x 39.37 inches H
• Package Dimensions: 15.171 inches W x 4.953 inches H x 40.599 inches L
• Package Weight: 47.99 pounds
• Type: Convertible Main Breaker
• Approvals: UL, NOM
• Country of Origin: US

Standard Information

• Brand: Schneider Electric
• Manufacturer Part Number: QO342MQ225RB