Siemens HJD63F400 Jd Frame Circuit Breaker 400A 3P

Product Description

The SIEMENS HJD63F400 is a molded case circuit breaker in the JD frame series, rated for 3-pole, 400-amp service at 600 volts AC. It provides overcurrent and short-circuit protection in commercial and industrial power distribution systems. The HJD63F400 is designed for installation in panelboards, switchboards, and motor control centers where high-capacity branch or feeder circuit protection is required. Licensed electricians and electrical contractors handle installation. The breaker's molded case construction houses the thermal-magnetic trip mechanism, delivering reliable fault interruption in demanding environments.

This breaker is suited for commercial and industrial applications requiring 3-pole, 400-amp feeder or branch circuit protection at up to 600 volts AC. Typical installation scenarios include main distribution panels, feeder circuits to large HVAC equipment, motor branch circuits, and industrial control panels. It is commonly specified in new construction and retrofit projects where the JD frame form factor is required by the existing equipment or switchgear lineup.

Key Features

• 400-amp continuous current rating for high-capacity circuit protection
• 3-pole configuration for three-phase power distribution applications
• 600-volt AC rating suitable for commercial and industrial systems
• JD frame molded case construction with integrated thermal-magnetic trip mechanism
• Designed for feeder and branch circuit protection in panelboards and switchboards

Compatibility

Designed as an OEM-style replacement or direct-fit breaker for commercial and industrial panelboards and switchboards that accept JD frame molded case circuit breakers.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. De-energize the panel and verify absence of voltage with a calibrated meter before handling or installing the breaker. Ensure the bus and mounting hardware in the enclosure are rated to accept a JD frame breaker at 400 amps. Do not attempt to field-modify the trip mechanism or use the breaker beyond its rated voltage and amperage.

Technical Specifications

• Amperage Rating: 400 amps
• Number of Poles: 3
• Voltage Rating: 600 volts AC
• Frame Series: JD
• Breaker Type: Molded Case Circuit Breaker
• Weight: 15.801 pounds

Standard Information

• Brand: SIEMENS
• Manufacturer Part Number: HJD63F400