Vertiv FSC3N003 30A 120/208V WYE Power Distribution Unit
Overview
The Vertiv FSC3N003 is a 30-amp, three-phase power distribution unit built for high-density data center racks and commercial equipment rooms where stable, flexible power delivery is non-negotiable. With a NEMA L21-30P input plug and support for both 120V and 208V output, this unit handles mixed-voltage rack environments without requiring separate branch circuits for each voltage tier. If you're running a cabinet that mixes 120V networking gear with 208V servers or storage, the FSC3N003 eliminates the need for separate PDUs for each voltage level.
Vertiv's power infrastructure line is engineered for enterprise and mission-critical environments — the FSC3N003 fits directly into that lineage, designed to sit inside standard equipment racks where uptime and load management matter.
Key Features
- 30A Capacity: At 30 amps, this PDU handles substantial rack loads — enough headroom for a fully populated 1U/2U server rack without approaching the 80% continuous-load threshold that NEC best practice requires. For a rack running 20–24A average draw, you have real margin before load alarms trigger.
- 120/208V WYE Input: The WYE three-phase input at 120/208V is the standard commercial building power topology. This means the FSC3N003 plugs directly into most data center and IDF room PDPs without step-up or step-down transformers — reducing both cost and points of failure in the power chain.
- Dual Output Voltage (120V or 208V): The ability to deliver either 120V or 208V from a single unit gives you flexibility in how you populate the rack. Network switches, KVMs, and legacy 1U servers typically want 120V; high-density compute and storage increasingly specifies 208V for efficiency. One PDU covers both — no secondary circuit required.
- Universal Connector Output: The universal connector output format accommodates a range of receptacle configurations, making the FSC3N003 deployable across mixed equipment inventories without adapter proliferation. This matters in environments where rack contents change as hardware refreshes occur.
- NEMA L21-30P Input Plug: The L21-30P twist-lock plug is the industry standard for 30A, 3-phase, 120/208V WYE circuits. It provides a secure, vibration-resistant connection — critical in environments with cooling airflow or physical cable management that can introduce mechanical stress on power connections.
- 50/60Hz Compatibility: Dual-frequency support means this unit operates on both North American 60Hz grid power and international 50Hz infrastructure. Relevant if you're standardizing rack PDU inventory across domestic and overseas facilities, or if your generator backup operates at a slightly different frequency during transfer.
- 60°C Operating Temperature: Rated to operate continuously at up to 60°C — well above the ASHRAE A2 envelope (35°C) and into the A3/A4 range. In a hot-aisle/cold-aisle data center, the PDU won't derate or fault even in poorly conditioned secondary spaces or edge deployments where ambient temperatures run high.
Integration & Compatibility
The FSC3N003 is designed to integrate with standard data center power infrastructure. The L21-30P input connects directly to 30A, 3-phase WYE branch circuits — the type commonly provisioned off a 3-phase PDU or power panel in commercial data centers and server rooms. Confirm your panel or upstream PDU provides a NEMA L21-30P receptacle before ordering; this is the standard for this amperage/voltage combination, but some facilities use NEMA L15-30 (250V, 3-phase WYE, 30A) which is not interchangeable.
The universal connector output format of the FSC3N003 supports flexible receptacle configurations — verify your specific outlet configuration against your equipment power cords during pre-deployment planning. For power distribution units and associated rack power infrastructure, matching input plug type and circuit breaker rating at the panel is the most common installation error. Review your Vertiv power infrastructure options to ensure the full power chain — from panel to PDU to device — is correctly specified.
For installations pairing this PDU with network security hardware, rack-mounted network video recorders, or edge compute nodes, confirm total rack load stays within 80% of the 30A circuit capacity under continuous operation. For environments also requiring structured cabling and PoE switches, plan branch circuit allocation to keep the PDU load balanced across phases. Consult your facility's electrical drawings for available panel capacity before provisioning the L21-30P circuit.
Frequently Asked Questions
Q: What input plug type does the FSC3N003 use?
A: The FSC3N003 uses a NEMA L21-30P twist-lock input plug, which is the standard for 30A, 3-phase, 120/208V WYE circuits. Ensure your panel or upstream PDU provides a matching L21-30P receptacle before installation.
Q: What output voltages does the FSC3N003 support?
A: The FSC3N003 supports both 120V and 208V output, making it suitable for mixed-voltage rack environments where some equipment requires 120V and other devices require 208V efficiency-optimized power.
Q: What is the maximum continuous load for the FSC3N003?
A: The FSC3N003 is rated at 30A capacity. Per NEC best practice, continuous loads should not exceed 80% of circuit rating — plan for no more than 24A of continuous draw to stay within code-compliant operating parameters.
Q: Can the FSC3N003 be used with international 50Hz power infrastructure?
A: Yes. The FSC3N003 supports both 50Hz and 60Hz input frequency, making it compatible with international facilities or generator power that may operate at 50Hz.
Q: What is the operating temperature rating for the FSC3N003?
A: The FSC3N003 is rated to operate at up to 60°C, which exceeds the ASHRAE A2 envelope. This allows deployment in edge locations, secondary equipment rooms, or hot-aisle environments without thermal derating.
Q: Is the L21-30P plug interchangeable with NEMA L15-30?
A: No. The NEMA L21-30P (120/208V WYE, 3-phase, 30A) is not interchangeable with the NEMA L15-30 (250V, 3-phase, 30A). Verify your facility's panel receptacle type before installation to avoid a mismatch.
The FSC3N003's 120/208V WYE dual-voltage output is the spec I key in on first when evaluating PDUs for mixed-vendor racks. Most data center buildouts I see involve exactly this scenario — legacy 120V network and security hardware alongside 208V compute — and having one 30A PDU handle both voltages on a single L21-30P circuit keeps the panel design clean and reduces the number of discrete branch circuits you need to provision.
Technical Highlights:
- 30A L21-30P Input: Twist-lock NEMA L21-30P provides a vibration-resistant, secure connection to the branch circuit — no adapter needed on standard 3-phase WYE panels. The 30A rating gives a 6A margin above 24A NEC continuous-load threshold.
- Dual Voltage Output (120V / 208V): Supporting both output voltages from one unit means you don't need to run separate 120V and 208V branch circuits to a single rack — a real labor and panel-space saver in dense deployments.
- 60°C Operating Temperature: The 60°C thermal ceiling means this PDU won't derate in warm secondary equipment rooms or edge telecom closets where HVAC may be minimal or absent — a spec that matters outside the controlled data center environment.
Deployment Considerations:
- Before pulling the L21-30P circuit, confirm your panel has 3-phase WYE capacity at 120/208V — not all commercial facilities have 3-phase WYE available at the IDF level. Delta configurations won't match this plug and voltage spec.
- The universal connector output gives flexibility, but it also means you need to confirm your specific outlet layout matches your equipment cord ends during pre-deployment staging — don't assume a universal connector covers every receptacle type you have in the rack without a physical check.
The FSC3N003 is the right call for a mixed-voltage security operations center rack — specifically where you're combining 120V surveillance recording appliances, PoE switch stacks, and 208V-native compute nodes under a single 30A branch circuit. That's the deployment scenario this unit is built for.
