Eaton Magnum SB Low Voltage Switchboard Breaker

Eaton Magnum Switchboard Breaker: Safety, reliability, and UL-891 switchboard compliance for low-voltage power systems.

Table Of Contents
  1. What Is the Eaton Magnum SB?
  2. What Makes Eaton Magnum SB Breakers So Versatile?
  3. SB Frame Sizes and Current Ratings
  4. SB Breakers with Digitrip Trip Units
  5. Accessories and Options for SB Breaker
  6. Magnum SB vs Magnum DS: What’s the Difference?
  7. FAQ
  8. Magnum SB Reference

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Introduction

What Is the Eaton Magnum SB?

Designed for UL 891 switchboards, the Eaton Magnum SB low voltage insulated‑case power circuit breaker line brings you reliable protection and flexibility for power distribution systems.

Whether you’re upgrading an existing system, replacing Eaton Cutler Hammer breakers, or designing from scratch, it supports three‑ and four‑pole configurations, offers both fixed and drawout mounting, and covers a wide current range—from 200 A up to 6000 A.  

eaton magnum sb parts
UL 1066 listed

What Makes Eaton Magnum SB Breakers So Versatile?

The Eaton Magnum Low Voltage Switchboard Breaker is UL 1066 listed (safety standard for low-voltage AC and DC power circuit breakers used in enclosures), which means it’s customized for switchboard-class applications with fixed internal instantaneous trips — important for safety and coordination.

Plus, it works seamlessly in fixed or drawout breaker designs for service-friendly access. The compact build and broad current range mean you’ve got gear that fits snugly in tight enclosures that power large loads. Built-in Digitrip capabilities give protection and diagnostics. Adaptable mounting, configurable protection, and wide-ranging ratings make the SB model stand out.

Breaker Frame Selection

SB Frame Sizes and Current Ratings

You’ll need to pick the right frame, and the Eaton Magnum Low Voltage Switchboard Breaker frame sizes and current ranges give plenty of flexibility. There are three main configurations:

Narrow frame: 800–2000 A
Standard frame: 800–3000 A
Double frame: 3200–6000 A

If you’re installing a feeder breaker or a main switch, there’s a frame that matches. The Eaton Magnum Low Voltage Switchboard Breaker covers up to 635 Vac and up to 150 kA interrupting ratings depending on your setup. This means power density in a lineup that’s still modular and service-friendly — so it scales with your system.

Frame SizeCurrent RangeWidthTypical UsePopular Part Numbers
Narrow Frame800–2000 A336 mm (13.2 in)Space-limited installationsSBH02000FFG, SBH01600FFG, SBH00800FFG
Standard Frame800–3200 A432 mm (17.0 in)Standard power distributionSBS03200FFG, SBS02500FFG, SBS01600FFG
Double Narrow Frame4000 A667 mm (26.3 in)High current, limited spaceSBL04000FFG, SBL03500FFG
Double Standard Frame3200–6300 A909 mm (35.8 in)Main and tie breakers in large systemsSBM06300FFG, SBM05000FFG, SBM03200FFG
See the complete Eaton Cutler Hammer Circuit Breaker Catalog
Trip Unit Long, Short, Instantaneous

SB Breakers with Digitrip Trip Units

Digitrip RMS trip units deliver LSI protection (Long-time trip, Short-time trip, Instantaneous trip) plus diagnostics and metering for monitoring your power system. For safety, Magnum SB current‑limiting models give up to 150 kA interruption ratings.

Fast‑opening contacts reduce arc‑flash energy and protect downstream components. Fixed internal instantaneous trips help clear faults quickly within the standard three‑cycle design. This means your system gets both fast response and smart protection from the Eaton Magnum Low Voltage Switchboard Breaker.

Magnum SB Add-Ons

Accessories and Options for SB Breaker

Eaton offers a solid lineup of Eaton Magnum Low Voltage Switchboard Breaker accessories to fit exactly what you need. Looking to remotely trip the breaker? Add shunt trips or undervoltage releases. Need motor operators for remote close/open? You’re covered with UL‑listed kits.

Alarms or status feedback are done with bell alarm switches, auxiliary contacts, and overcurrent trip switches for automation. For security, there are padlockable handles and mechanical interlocks, plus the ability to add these parts in the field—keeping your workflow moving.

Standards and Applications

Magnum SB vs Magnum DS: What’s the Difference?

The difference between Magnum SB vs Magnum DS breakers comes down to standards and applications. The SB family is UL-rated for switchboard-class, ideal for UL 891 switchboards. While Magnum DS targets ANSI-rated switchgear built for UL 1066 used in heavy-duty switchgear.

SB and DS share accessories and smart trip units. Their construction similarities make inventory easier. So, if you’re managing equipment or specifying systems, this is a plus.

FAQ

Magnum SB Reference

  • IEC 60947-2 – Governs the performance and safety of low-voltage breakers
  • ARMS – Arcflash Reduction Maintenance System
  • Withstand Rating – Ability to tolerate short circuits
  • Digitrip – Trip unit platform with programmable protection
  • Current Limiting – Reduces let-through energy during faults
  • Frame Size – Determines physical/electrical breaker size
  • Withdrawable Design – Removable from cassette for maintenance
  • Trip Unit – Senses faults and trips the breaker
  • Nameplate Rating – Breaker’s official operational limits

🔧 Need Magnum SB service or parts? Call 800.497.6255