EATON PL9-C4/2-DC – 2-Pole DC Miniature Circuit Breaker for Precise Low-Current Protection

The EATON PL9-C4/2-DC is a compact, 2-pole DC miniature circuit breaker designed for reliable protection of low-current DC circuits. With a C-characteristic at 4 A, it suits control panels, battery-backed systems, and compact DC distribution where you want fast, predictable tripping without nuisance trips. From my experience, this model fits neatly into standard DIN-rail enclosures and plays nicely with typical xPole accessories, which keeps panel layouts tidy and scalable.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery time: 1 week for in-stock; no more than one month at the latest
• Payment: 50% advance payment, full payment for delivery
• Express delivery: FedEx, UPS, DHL

Key Features

• DC-rated, 2-pole protection – Built for DC circuits where arcing behavior differs from AC; helps ensure safe interruption on battery, PV combiner, and telecom rails.
• 4 A, C-curve tripping – C-characteristic typically trips at 5–10× In magnetically, balancing start-up tolerance with fault responsiveness.
• DIN-rail mounting – Standard 35 mm DIN rail (EN 60715); quick to install or swap during service windows.
• Compact 2-module width – Saves space in crowded control cabinets; typically around 36 mm wide for 2 poles.
• Front-wired screw terminals – Clear line/load handling; supports common industrial wire sizes in most cases.
• Panel-friendly accessory ecosystem – Compatible with typical xPole auxiliary contacts, shunt trips, and comb busbars, making multi-circuit builds simpler.

Technical Specifications

Application Fields

• Battery and UPS racks (24–60 VDC typical) – Branch protection for battery strings and DC distribution panels.
• Telecom and networking power – 48 VDC feeders in MDF/IDF cabinets and rectifier outputs.
• Solar combiner/array boxes – String-level protection in compact PV DC enclosures where space is tight.
• Industrial control panels – DC control circuits, sensors, and low-power actuators that still require dependable fault clearing.
• Lab and R&D benches – Neat, repeatable DC protection during prototype testing.

You might notice that in many cases the PL9-C4/2-DC is chosen for low-current DC rails where nuisance trips would be costly. A controls integrator we work with mentioned their panels “ran cooler and stayed serviceable” after standardizing on 2-pole DC breakers like this, mainly because troubleshooting became more straightforward and labeling was consistent across projects.

Advantages & Value

• Reliability in DC fault conditions – Designed for DC interruption, which can be tougher to extinguish than AC arcing.
• Compatibility – Standard DIN form factor; typically works with Eaton xPole accessory add-ons and comb busbars for clean builds.
• Cost control – Compact 2-module footprint helps reduce panel size, wiring time, and spare stock variety.
• Technical support – Widely adopted architecture, making documentation and field know-how easier to access.

Installation & Maintenance

• Cabinet & mounting – Use a ventilated enclosure meeting IEC cabinet standards; mount on 35 mm DIN rail with proper end-stops.
• Wiring and torque – Use ferrules where appropriate; follow the conductor size and tightening torque in the Eaton datasheet (typically in the 2.0–2.5 Nm range for MCB terminals, but verify).
• Polarity & DC specifics – Observe polarity markings and series/parallel pole usage as specified for DC ratings. De-energize before servicing; DC arcs can persist.
• Ventilation – Maintain airflow; avoid continuous operation near upper ambient limits to minimize derating.
• Routine checks</-strong> – No calibration or firmware. Periodically retighten terminals (as permitted), inspect for discoloration, and verify mechanical operation of the lever.

Quality & Certifications

• Compliance – Typically complies with IEC/EN 60947-2 for industrial circuit breakers; CE marking.
• Environmental – RoHS compliant in most markets.
• Manufacturer’s warranty – 365-day warranty provided by us on supply.

One thing I appreciate is how consistent the PL-series footprint is across ratings, which keeps spares lean. If you’re standardizing on a DC rail and need matching auxiliaries or comb busbars, we can propose compatible xPole accessories so your assembly remains modular.