Application Flexibility and Reliable Performance
Eaton’s Magnum™ SB is a low-voltage insulated-case power circuit breaker family engineered specifically for the performance and economic requirements of UL® 891 switchboards. Listed under UL 1066, the Magnum SB delivers the robustness of a power circuit breaker with the compact footprint and economics of a molded-case solution, making it an ideal choice for demanding switchboard applications.
All Magnum SB breakers feature a fixed instantaneous trip of 18×In18×I
, ensuring fault clearing within three cycles to meet switchboard class requirements. Their short-time withstand and interruption ratings are optimized for 480 Vac systems, providing dependable protection where it matters most.
.jpg)
Key Features & Benefits
Switchboard Class Design – Purpose-built for UL 891 switchboards with fixed instantaneous trip settings characteristic of UL 489 molded-case breakers used in these applications.
Broad Performance Range – Available from 200A to 6000A continuous current with interrupting ratings from 50 kA to 150 kA and short-time withstand up to 100 kA.
100% Rated – Full continuous current rating across all frame sizes without derating.
Three Frame Sizes – Narrow, Standard, and Double frames to facilitate compact enclosure configurations and optimize panel space.
High Withstand Options – Maximize system coordination with breakers offering superior short-time withstand capabilities.
Current Limiting Models – Fuseless fast-opening Magnum SB breakers deliver high interrupting ratings with low energy let-through, significantly reducing arc flash hazards.
Field-Installable Accessories – UL-approved accessories common across all Magnum breakers, easily added or replaced at the point of use without factory recalibration.
Digitrip™ Trip Unit Family – Protection, Coordination & Diagnostics
All Magnum SB breakers are equipped with microprocessor-based Digitrip™ RMS trip units, offering scalable functionality from basic overcurrent protection to advanced power monitoring:
Programmable overcurrent protection and alarms
Ampere and power metering with power quality analysis
Local display for real-time information and diagnostics
Communication via translators to standard protocols: Modbus, INCOM™, and PROFIBUS®
Zone-selective interlocking for improved coordination
Arcflash Reduction Maintenance System™ technologies for arc flash mitigation
Breaker health monitoring for predictive maintenance
Safety & Certifications
ANSI, UL, CSA®, and NEMA® certifications and approvals
Arc flash reduction solutions integrated into the design
Closed-door levering and controlled access for enhanced operator safety
Primary disconnecting contacts are mounted on the breaker for ease of inspection and replacement.
Complete Model Lineup – Magnum SB Series
| Breaker Type | Frame Type | Frame Amperes | Interrupting Ratings (kA) at 508 Vac | Short-Time Withstand (kA) |
| SBN-508 | Narrow | 800 | 50 | 20 |
| SBN-608 | Narrow | 800 | 65 | 20 |
| SBN-C08 | Narrow | 800 | 100 | 20 |
| SBS-608 | Standard | 800 | 65 | 20 |
| SBS-C08 | Standard | 800 | 100 | 20 |
| SBN-512 | Narrow | 1200 | 50 | 25 |
| SBN-612 | Narrow | 1200 | 65 | 25 |
| SBS-C12 | Narrow | 1200 | 100 | 25 |
| SBS-612 | Standard | 1200 | 65 | 25 |
All models are available in three- and four-pole configurations, with fixed or drawout mounting options, and support a wide range of current sensor and rating plugs to establish the breaker In rating (200A – 6000A).
Maintenance, Modification & Service
UL-approved field-installable accessories common across all frame sizes
Primary disconnecting contacts are mounted on the breaker for easy inspection and replacement
Renewal parts readily available for point-of-use service
Eaton Electrical Services & Systems available for startup and ongoing support
