NXD63B120 | Siemens Sentron 1200A 3-Pole 600V Thermal-Magnetic Molded Case Circuit Breaker
Siemens · Circuit Breakers & Protection
Description The Siemens® NXD63B120 is a Sentron Series molded case circuit breaker (MCCB) designed for high-capacity protection in industrial and commercial power distribution systems. Rated for 1200 amps, 600 volts, and 3 poles, it features a thermal-magnetic, non-interchangeable trip unit that delivers dependable overload and short-circuit protection. Built on the ND frame, this breaker combines robust construction with standard interrupting capacity for reliable performance under heavy electrical loads. Technical Specifications Condition New/Never Used Surplus Brand Siemens / ITE Category Circuit Protection Devices Part Number NXD63B120 Subcategory Molded Case Circuit Breaker Series Sentron Series Frame Type ND Frame Number of Poles 3 Phase 3-Phase Rated Current 1200 A Rated Voltage 600 VAC Interrupting Capacity 25 kA @ 600V, 50 kA @ 480V Trip Unit Type Thermal-Magnetic (non-interchangeable) Protection Type Long-Time (overload) and Instantaneous (short-circuit) Calibration Temperature 40°C (standard) Mounting Type Bolt-On Terminal Type No lugs installed (field-configurable) Approvals / Standards UL 489, IEC 60947-2 Design Feature Standard breaking capacity Enclosure Rating Suitable for enclosed panelboard installation Dimensions (W × H × D) 9 × 16 × 6 in Material Molded case with steel mounting hardware Operating Frequency 50/60 Hz Manufacturer Siemens Breakers Weight 47 lbs (approx.) Information About NXD63B120 The NXD63B120 belongs to the Siemens Sentron NXD family of molded case circuit breakers, engineered for precision and safety in low-voltage electrical systems. Designed for 3-phase, 600V AC operation, it supports an interrupting capacity of 50 kA at 480V and 25 kA at 600V, providing strong fault-clearing capability for critical installations. This model features a bolt-on mounting design for secure panel integration and includes a non-interchangeable thermal-magnetic trip unit, which combines long-time overload and instantaneous short-circuit protection. Operating at a standard 40°C calibration, the NXD63B120 complies with UL 489 and IEC 60947-2 standards, making it suitable for power distribution panels, switchboards, and control assemblies requiring durable, high-current circuit protection. Key Features: High Current Capacity: Rated 1200A, ideal for large-scale electrical distribution systems. Thermal-Magnetic Trip Unit: Provides both overload (thermal) and short-circuit (magnetic) protection. Standard Interrupting Ratings: 50 kA @ 480V and 25 kA @ 600V for dependable fault clearing. Bolt-On Mounting: Ensures a secure and stable installation in panelboards or switchgear. Non-Interchangeable Trip Unit: Factory-calibrated for optimal performance and reliability. UL 489 and IEC 60947-2 Certified: Meets international standards for molded case circuit breakers. Compact ND Frame: Space-efficient 9 × 16 × 6 in. design for simplified integration. Rugged Construction: Engineered for durability in harsh industrial operating conditions. The NXD63B120 delivers the high current protection and reliability demanded in industrial power distribution and motor control systems.
Brand: Siemens · Category: Circuit Breakers & Protection
Key features
- High Current Capacity: Rated 1200A, ideal for large-scale electrical distribution systems.
- Thermal-Magnetic Trip Unit: Provides both overload (thermal) and short-circuit (magnetic) protection.
- Standard Interrupting Ratings: 50 kA @ 480V and 25 kA @ 600V for dependable fault clearing.
- Bolt-On Mounting: Ensures a secure and stable installation in panelboards or switchgear.
- Non-Interchangeable Trip Unit: Factory-calibrated for optimal performance and reliability.
- UL 489 and IEC 60947-2 Certified: Meets international standards for molded case circuit breakers.
- Compact ND Frame: Space-efficient 9 × 16 × 6 in. design for simplified integration.
- Rugged Construction: Engineered for durability in harsh industrial operating conditions.
Specifications
| Manufacturer part number | NXD63B120 |
|---|---|
| Condition | New/Never Used Surplus |
| Brand | Siemens / ITE |
| Category | Circuit Protection Devices |
| Part Number | NXD63B120 |
| Subcategory | Molded Case Circuit Breaker |
| Series | Sentron Series |
| Frame Type | ND Frame |
| Number of Poles | 3 |
| Phase | 3-Phase |
| Rated Current | 1200 A |
| Rated Voltage | 600 VAC |
| Interrupting Capacity | 25 kA @ 600V, 50 kA @ 480V |
| Trip Unit Type | Thermal-Magnetic (non-interchangeable) |
| Protection Type | Long-Time (overload) and Instantaneous (short-circuit) |
| Calibration Temperature | 40°C (standard) |
| Mounting Type | Bolt-On |
| Terminal Type | No lugs installed (field-configurable) |
| Approvals / Standards | UL 489, IEC 60947-2 |
| Design Feature | Standard breaking capacity |
| Enclosure Rating | Suitable for enclosed panelboard installation |
| Dimensions (W × H × D) | 9 × 16 × 6 in |
| Material | Molded case with steel mounting hardware |
| Operating Frequency | 50/60 Hz |
| Manufacturer | Siemens Breakers |
| Weight | 47 lbs (approx.) |
| Product type | Molded Case Circuit Breaker |
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