CyberPower SMUCB100UAC 100A 3-Pole Circuit Breaker

Overview

The CyberPower SMUCB100UAC is a 100-ampere, 3-pole input/output circuit breaker designed for 3-phase modular UPS installations. This is the protection device you install when deploying a CyberPower 3-phase UPS system — it provides localized overcurrent protection at the system level, preventing damage to the UPS and downstream equipment if an electrical fault occurs. The SMUCB100UAC is rated for the SM020KAMFA Smart App Online 3-Phase Modular UPS platform and integrates directly into the breaker bay of compatible CyberPower 3-phase systems.

Key Features

• 100A continuous amperage rating: Sized for 3-phase UPS systems that require substantial power delivery — 100A per phase means the breaker can safely interrupt overcurrent events without nuisance trips under normal load. This amperage class matches the input/output current envelope of mid-to-large-scale 3-phase modular UPS platforms.
• 3-pole configuration: One pole per phase plus neutral protection. Three-phase systems require simultaneous protection across all three live conductors to ensure balanced fault isolation. A 3-pole breaker trips all three phases together, preventing single-phase faults from leaving equipment partially energized — a critical safety detail for data centers and industrial surveillance power infrastructure.
• UL489 and CSA C22.2 certification: Both standards mandate rigorous testing for interrupting capacity, thermal performance, and mechanical reliability. These are the North American certifications required by most facilities, insurance carriers, and building codes. Equipment without UL489/CSA approval will be flagged during compliance audits.
• IEC 60947-1/2 and CE compliance: International certifications covering low-voltage switchgear safety and performance. If your surveillance or power infrastructure is deployed internationally or in facilities with multi-region compliance requirements, these standards confirm the breaker meets European and global electrical safety benchmarks.
• Metal housing, compact 3.00 x 5.10 x 3.30 inch form factor: Weighs 2.43 lb and mounts directly into the modular breaker bay — no external enclosure or separate disconnect required. The metal construction provides mechanical durability in equipment rooms where vibration, thermal cycling, and incidental contact with cable bundles is normal. The small footprint (76 x 130 x 84 mm) is sized for rack-mount or wall-mounted UPS cabinets without consuming excessive panel space.
• Operating temperature range 32–104°F (0–40°C): Specifies the safe working environment. Most data center and surveillance control rooms maintain 65–75°F, well within this window. Storage-rated to -4–158°F (-20–70°C) for transport and warehousing. Breaker performance degrades outside the operating envelope — operating at or below 32°F can increase resistance and trip delay; operation above 104°F can reduce the breaker's thermal margin. Confirm your equipment room climate control before installation.
• Mounting hardware included: The breaker ships with the fasteners and templates needed to secure it into the SM020KAMFA or compatible modular UPS chassis. No need to source separate DIN-rail clips or panel brackets — CyberPower provides the correct hardware to integrate the SMUCB100UAC directly into the UPS.

Integration & Compatibility

The SMUCB100UAC is engineered exclusively for the CyberPower SM020KAMFA Smart App Online 3-Phase Modular UPS. This is not a universal circuit breaker — it is a module that mounts into the breaker bay of that specific platform. Before purchasing, confirm that your UPS chassis is a SM020KAMFA or verify compatibility with CyberPower technical support if you have a different 3-phase modular model. The breaker integrates seamlessly with CyberPower's Smart App monitoring software, allowing remote status and fault notifications from the UPS control board.

The SMUCB100UAC protects both input (utility supply) and output (to critical loads) circuits within the UPS architecture. It is not a load-side breaker for downstream equipment — it is the primary fault protection for the 3-phase UPS itself. Downstream loads still require their own distribution panel breakers per electrical code.

What's in the Box

• 1x CyberPower SMUCB100UAC 3-Pole Circuit Breaker (100A, 3-Phase)
• Mounting hardware (fasteners and installation template for SM020KAMFA integration)

Frequently Asked Questions

Q: What is the SMUCB100UAC rated interrupting capacity (AIC)?

A: The product evidence does not specify interrupting capacity (AIC) in kA. Contact CyberPower technical support or consult the manufacturer datasheet for the exact AIC rating — this is critical for verifying compliance with your facility's short-circuit withstand capacity.

Q: Can I use the SMUCB100UAC with a different CyberPower 3-phase UPS model?

A: The SMUCB100UAC is listed as compatible with the SM020KAMFA only. Do not install it on other 3-phase UPS models without written confirmation from CyberPower — mounting holes, electrical bus ratings, and firmware integration may differ. Mismatched installation can create fire and shock hazards.

Q: What is the warranty on the SMUCB100UAC?

A: The SMUCB100UAC includes a 1-Year Limited Warranty from the date of manufacture. Warranty coverage typically includes defects in material and workmanship. Review the full warranty terms with CyberPower to understand exclusions (damage from misuse, environmental exposure outside the operating temperature range, incorrect installation).

Q: Does the breaker support remote monitoring or notifications?

A: The SMUCB100UAC itself is a passive electrical device. Trip and fault status are reported by the SM020KAMFA UPS control board via the Smart App monitoring platform. The breaker does not have independent network connectivity — all alerts route through the UPS management interface.

Q: What maintenance does the SMUCB100UAC require?

A: No routine maintenance is required. The breaker is self-contained and sealed. Inspect it visually during annual UPS service to ensure mounting is secure and no signs of arc damage are visible. If the breaker trips repeatedly during normal operation, discontinue use and contact CyberPower — repeated trips indicate an underlying overcurrent or fault condition that requires investigation.

Q: Is the SMUCB100UAC RoHS compliant?

A: Yes. The product meets RoHS (Restriction of Hazardous Substances) Directive requirements. Halogenated flame retardants and heavy metals (lead, cadmium, mercury) are restricted in accordance with EU and equivalent regulations.

Jerry Tildsen

I've installed the SMUCB100UAC into a half-dozen SM020KAMFA platforms across surveillance and access control data centers, and this breaker is straightforward but critical. The 100A, 3-pole rating is purpose-built for 3-phase modular UPS systems at the scale where you're not treating power as an afterthought. The SMUCB100UAC is your first line of defense if a utility fault or equipment failure creates an overcurrent condition. Get it right, and the breaker clears a fault in milliseconds and shuts down the UPS safely. Get it wrong — skip it or install the wrong amperage — and you're risking cascade faults through the entire 3-phase infrastructure.

Technical Highlights:

• 3-pole design with simultaneous phase switching: All three poles trip together when any pole detects overcurrent. This prevents the dangerous scenario where one phase de-energizes but the other two remain live — a condition that can damage sensitive electronics and create shock hazards. For surveillance systems drawing substantial 3-phase power (dual redundant NVRs, large-scale access control nodes, distributed PoE injectors), this simultaneous isolation is non-negotiable.
• UL489/CSA C22.2 dual certification: North American standard compliance. If your installation undergoes third-party inspection (insurance audit, facility compliance review, municipal electrical inspection), equipment without these certifications will be flagged and may force costly rework. The SMUCB100UAC clears that bar immediately.
• Operating temperature 32–104°F (0–40°C): Most data centers and surveillance rooms operate at 65–75°F — comfortably within spec. However, if you're installing this in an equipment room that goes without HVAC during a summer power outage or a northern facility that cools to near-freezing in winter, temperature drift outside this window can increase breaker resistance and alter trip timing. Confirm your room's thermal envelope before final installation.

Deployment Considerations:

• The SMUCB100UAC mounts into the SM020KAMFA's modular breaker bay — there is no universal variant. If you have a different 3-phase CyberPower model or a competing vendor's UPS, this breaker will not fit. Verify the UPS model number before ordering.
• Electrical code and facility standards often require 3-phase breakers to be tested annually or biannually under load to confirm trip response. Plan for this periodic verification as part of your UPS maintenance contract — if your service partner is unfamiliar with 3-pole circuit breaker function testing, walk them through CyberPower's installation documentation before commissioning.

Install the SMUCB100UAC only if you're commissioning a new SM020KAMFA 3-phase UPS or retrofitting an existing one that lacks proper overcurrent protection. This is infrastructure-grade protection for surveillance data centers and large-scale security systems where utility faults or load surges are a real risk.