Siemens CQD390 Molded Case Circuit Breaker – 90A – 3-Pole / 3-Phase – 277/480V – 14kA @ 480V – Feed-Thru – CQD Series

The Siemens CQD390 is a 90A, 3-pole, 3-phase molded case circuit breaker from the Siemens CQD Series. It features thermal-magnetic protection with Long-Time and Instantaneous (LI) trip functions and is designed for compatible electrical distribution applications.

The breaker is rated for 277/480V and provides a 14kA interrupting rating at 480V with standard interrupting capacity. It features a feed-thru configuration and is supplied complete with line-side and load-side lug terminals. The breaker is rated for operation at 40°C.

Specifications:

• Manufacturer: Siemens
• Product Type: Molded Case Circuit Breaker
• Product Family: CQD
• Series: CQD
• Type: CQD
• Catalog No.: CQD390
• Current Rating: 90A
• Number of Poles: 3-Pole
• Phase: 3-Phase
• Voltage Rating: 277/480V
• Interrupting Rating: 14kA @ 480V
• Interrupting Capacity: Standard
• Protection Type: Thermal-Magnetic
• Trip Functions: Long-Time and Instantaneous (LI)
• Mounting / Connection: Feed-Thru
• Terminal Type: Line-Side and Load-Side Lug Terminals
• Breaker Configuration: Complete Breaker
• Temperature Rating: 40°C
• Application: Electrical Distribution and Overcurrent Protection

Part Numbers & Identification:

• Manufacturer Part Number (MPN): CQD390
• Catalog Number: CQD390
• Model: CQD390
• Product Family: Siemens CQD Circuit Breakers
• Series: CQD
• Type: CQD
• Brand: Siemens
• Manufacturer: Siemens
• Product Type: Molded Case Circuit Breaker
• Breaker Configuration: 3-Pole, 90A
• Trip Configuration: Long-Time and Instantaneous (LI)
• UPC:783643277847

Compatibility:

Designed for use with compatible Siemens CQD Series electrical distribution equipment that accepts CQD Series molded case circuit breakers. The CQD390 provides 90A, 3-pole thermal-magnetic overcurrent protection for compatible 277/480V, 3-phase electrical distribution applications.

The breaker features a feed-thru configuration and includes line-side and load-side lug terminals. Always verify the specific panelboard or electrical equipment model, approved breaker type, system voltage, available fault current, pole configuration, trip requirements, terminal arrangement, temperature requirements, and installation specifications before installation.

Certifications:

• Siemens CQD Series
• 90A Rated
• 3-Pole / 3-Phase
• 277/480V Rated
• 14kA @ 480V Interrupting Rating
• Standard Interrupting Capacity
• Thermal-Magnetic Protection
• Long-Time and Instantaneous (LI) Trip Functions
• Feed-Thru Configuration
• Line-Side and Load-Side Lug Terminals
• Complete Breaker
• 40°C Rated

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