Product Description
The PFLS-NGY-S120M40A is a 400A inline cable connector for neutral (N) distribution, with the gray neutral identification commonly used in USA 277/480V systems. This Line Source connector houses the male contact and innovative key-release pin, enabling tool-free disconnection while maintaining a low-impedance neutral return path. Engineered for North American power distribution systems where neutral is the reference point for grounding, voltage balance, and system safety.
Key Features
- The neutral function is foundational: it closes the circuit loops, balances voltage across all three phases, and provides the safety ground reference. Contact resistance below 0.1 milliohms and insulation integrity above 5000M Ohms ensure minimal voltage drop on the return path, protecting sensitive equipment and maintaining power quality across the distribution network.
- The male contact and key-release mechanism enable rapid, tool-free mating and unmating. During maintenance windows, service calls, or load rebalancing, the key-release pin allows a controlled disconnection once the circuit has been de-energized.
- The source variant uses a shorter polyoxymethylene (POM) cotter pin optimized for cable-mounted operation. If pin inspection or replacement is needed, a small slotted screwdriver allows field disassembly without special tools, enabling rapid technician response during service and maintenance.
- Rated for 400A continuous with 120mm² cable. Neutral carries up to 100% of phase current in unbalanced three-phase systems; this connector is sized for full-phase amperage to prevent neutral voltage rise and voltage imbalances that can shorten equipment lifespan.
- Not for current interruption: connect and disconnect only when the circuit is de-energized
Certifications & Standards
- The NEC permits white or gray for the neutral conductor, and gray is commonly used for the neutral in USA 277/480V systems. Using a gray connector keeps the 480V neutral visibly distinct from a white 120/208V neutral where both systems share a site.
- TÜV Rheinland certified to IEC 61984 (ID 1111322264), CB and UKCA certified, CE marked, RoHS, and REACH compliant. The gray housing matches the neutral colors permitted by NEC Article 200.6 (white or gray); always confirm against local requirements and the project wiring drawing.
Applications
- North American industrial distribution centers using gray neutral identification
- Data centers, utilities, and critical infrastructure with strict voltage stability requirements
- Manufacturing facilities with high-cycle reconfiguration (500+ mating cycles)
- Cable-to-cable neutral handoff in scalable and modular power distribution systems
- Three-phase systems with unbalanced loads requiring reliable return-path current handling
- Outdoor installations with IP67 sealed mating protection
- Emergency power and generator distribution with rapid neutral reconnection
Compatibility
The PFLS-NGY-S120M40A mates with corresponding PFLD (Line Drain) connectors and PFPS/PFPD panel-mount variants. Compatible with major brands of single-pole power connectors. R120 reduction sleeve (brass, silver-plated) accommodates up to 16.50mm diameter wire.
Phase / Wire Color Convention
Frequently Asked Questions
What is PFLS-NGY-S120M40A and what makes it innovative?
PFLS-NGY-S120M40A is a KUPO PowerFit 400A line source connector with a gray housing, designated for the Neutral (N) conductor under USA 277/480V conventions. As the source side of an inline cable connection, it features the innovative key-release pin that enables tool-free disconnection. The push-and-twist mechanism secures the connection during operation while allowing rapid uncoupling when needed.
What electrical performance does PFLS-NGY-S120M40A deliver?
PFLS-NGY-S120M40A is rated for 400 amperes continuous with 120mm² cable. The maximum voltage rating is 1000V AC or DC. The silver-plated brass contact achieves a contact resistance of just 0.1 milliohms, significantly reducing resistive heating compared to plain brass contacts at sustained high-current loads. This low resistance is particularly important for N circuits carrying continuous neutral current.
Why is gray used for the neutral connector PFLS-NGY-S120M40A in USA 277/480V systems?
Gray identifies the Neutral conductor in USA 277/480V systems. The NEC permits white or gray for the neutral; gray is commonly chosen for the 277/480V neutral so it stays distinct from a 120/208V white neutral in the same building or inventory. On the Line Source connector, the gray housing wraps the 170mm body including the area around the key-release mechanism. This means the phase is identifiable even during the push-and-twist connection process, reducing the chance of connecting to the wrong N circuit. A dedicated gray PowerFit connector for the neutral return path eliminates guesswork in three-phase-plus-neutral distribution systems.
What safety certifications apply to PFLS-NGY-S120M40A?
PFLS-NGY-S120M40A is TÜV Rheinland certified to IEC 61984 (ID 1111322264) under Type Approval, Safety, and Regular Production Surveillance categories. It also holds CB and UKCA certificates, and carries CE marking, RoHS compliance (Restriction of Hazardous Substances), and REACH compliance. The housing material achieves a UL94-V0 flammability rating, which is the top rating in the UL94 vertical burn (V) series, meaning the material self-extinguishes within 10 seconds with no flaming drips. The key-release pin mechanism has been certified as part of the TÜV evaluation, ensuring that the disconnect feature meets the same safety standards as the connection itself.
How does the key-release mechanism work on PFLS-NGY-S120M40A?
The PFLS-NGY-S120M40A features the innovative PowerFit push-and-twist connection. To connect, align the connector and push while twisting until it locks. To disconnect, the key-release pin enables tool-free uncoupling. Simply press the release and twist to separate. If needed, a small slotted screwdriver can assist with the release. For cable termination, the process follows the same steps as other PowerFit line connectors: strip 33mm of cable jacket, apply the reduction sleeve, tighten set screws to 10.5 N·m minimum, and secure the M40 cable gland. Uses the shorter cotter pin variant (vs the longer pin in Line Drain). The shorter pin accommodates the key-release mechanism. Never reuse cotter pins.
How does PFLS-NGY-S120M40A compare to traditional single-pole power connectors?
PFLS-NGY-S120M40A offers several meaningful improvements over conventional single-pole power connectors: the 1000V AC/DC voltage rating exceeds the typical 600V maximum of traditional alternatives; silver-plated brass contacts deliver lower contact resistance (0.1 milliohms) than plain brass; the integrated M40 cable gland with sealing bushing provides cable strain relief and environmental protection in a single assembly. These features, combined with TÜV Rheinland certification and the phase-encoded gray housing for N identification, make PowerFit a generation ahead of traditional designs.