WESTINGHOUSE 12NC900 U 900A 600V

Description:

The Westinghouse 12NC900 is a SELTRONIC fixed rating plug designed for use with Westinghouse NC-frame electronic trip molded case circuit breakers. This rating plug establishes a continuous current rating of 900 Amps and is used with SELTRONIC solid-state trip units to provide accurate overcurrent protection. It is commonly installed in industrial power distribution systems, switchgear, motor control centers, and commercial electrical installations requiring adjustable electronic trip protection. The 12NC900 is compatible with 1200A NC-frame breaker systems and is used to set the breaker's operating ampere rating.

Applications:

The Westinghouse 12NC900 SELTRONIC rating plug is commonly used in industrial and commercial electrical distribution systems to establish a 900 Amp continuous current rating for compatible NC-frame electronic trip circuit breakers. It is installed in switchgear, motor control centers, power distribution panels, data centers, manufacturing facilities, utility systems, and large commercial buildings where adjustable electronic trip protection and high-capacity power distribution are required. The rating plug works with SELTRONIC electronic trip units to provide accurate overcurrent protection, feeder circuit protection, and system coordination within 600 VAC power distribution networks.

Technical Specifications:

• Manufacturer: Westinghouse Electric Corporation
• Part Number: 12NC900
• Product Type: Circuit Breaker Rating Plug
• Series: SELTRONIC
• Type: 12NC
• Current Rating: 900 Amps
• Voltage System Compatibility: Up to 600 VAC
• Function: Sets breaker continuous current rating
• Trip Unit Compatibility: SELTRONIC Electronic Trip Units
• Compatible Breaker Frames: NC, NCA, NCG, NCGA, HNC, HNCA, HNCG, HNCGA
• Compatible Breaker Size: 1200A Frame Breakers
• Mounting Type: Plug-In Rating Element
• Application: Electronic trip molded case circuit breakers
• Installation Type: Internal trip unit accessory
• Certification: UL Listed
• Operating Environment: Industrial and commercial electrical applications
• Intended Use: Breaker ampere rating calibration and protection setup
• Status: Obsolete / discontinued manufacturer part, still available through aftermarket suppliers.

Common Replacements:

• Eaton 12NC900 SELTRONIC Rating Plug
• Eaton Series C Electronic Trip Rating Plug (retrofit application)
• Westinghouse / Cutler-Hammer 12NC Series 900A Rating Plug