Technical Specifications

• Product Model: PL9-C50-2-DC
• Brand: Eaton
• Warranty: One Year
• Input Voltage: Up to 250 V DC per pole
• Operating Temperature: -25°C to +55°C (typical operating range)
• Storage Temperature: -40°C to +75°C
• Response Time: Instantaneous magnetic trip at 5–10 × rated current (C-curve)
• Protection Class: IP20 terminal protection
• Accuracy Class: Thermal-magnetic tripping protection compliant with IEC standards
• Output Frequency: 0 Hz (designed for DC circuits)
• Rated Current Range: 50 A nominal current rating
• Communication Interface: None (electromechanical protective device)
• Supported Protocols: Not applicable – standalone circuit protection device
• Overload Capacity: Thermal overload protection with magnetic short-circuit trip
• Breaking Capacity: Up to 10 kA short-circuit interrupting capacity
• Number of Poles: 2-pole configuration
• Mounting Type: 35 mm DIN-rail installation (IEC/EN 60715)
• Standards Compliance: IEC/EN 60947-2
• Dimensions: Approx. 80 × 45 × 70 mm (typical for PL9 two-module design)

Product Description

Product Overview

The EATON PL9-C50-2-DC is a two-pole miniature circuit breaker designed for reliable protection of DC power distribution systems in industrial and commercial installations. This protective device belongs to the Eaton xPole PL9 series and provides combined thermal and magnetic tripping mechanisms to safeguard electrical circuits from overload and short-circuit faults.

Unlike standard AC breakers, this model is specifically engineered for DC applications where arc extinction is more challenging. The device incorporates specialized arc-quenching technology that ensures safe interruption of fault currents even when no natural current zero crossing exists in the circuit. This capability is essential for maintaining system safety and preventing damage to equipment or wiring.

The breaker is rated at 50 A with a C-curve tripping characteristic, making it suitable for circuits with moderate inrush currents such as control transformers, DC motors, and power supply systems. With a high breaking capacity of up to 10 kA, it provides robust protection in demanding industrial environments.

Its compact two-module design allows efficient installation in DIN-rail distribution panels, enabling high-density cabinet layouts commonly used in automation control panels, renewable energy systems, and telecommunications power infrastructure.

Key Functions

Overcurrent and Short-Circuit Protection

The breaker integrates a thermal release for overload protection and a magnetic trip mechanism for rapid short-circuit interruption. This dual protection prevents damage to cables, power supplies, and downstream equipment.

DC-Optimized Arc Interruption

Because DC current does not naturally cross zero, arc suppression is more complex. The device incorporates specialized arc-extinguishing chambers that safely interrupt DC fault currents and reduce fire risks.

C-Curve Tripping Characteristic

The C-curve configuration triggers instantaneous magnetic tripping when the current reaches approximately five to ten times the rated current. This characteristic is suitable for circuits with moderate inrush currents.

Compact DIN-Rail Installation

The two-pole module mounts directly onto a standard 35 mm DIN rail, allowing quick installation and easy integration into electrical distribution cabinets and automation control panels.

High Breaking Capacity

With a rated short-circuit interrupting capacity of up to 10 kA, the breaker can safely disconnect large fault currents, ensuring reliable protection for industrial DC power systems.

Application Scenarios

Photovoltaic and Renewable Energy Systems

DC circuit breakers are essential in solar PV installations where high-voltage DC power flows from solar arrays to inverters. The device protects wiring and equipment from overload and short-circuit faults.

Battery Energy Storage Systems

Energy storage installations rely on DC distribution networks between battery modules, power converters, and control systems. The breaker provides reliable isolation and circuit protection.

Industrial Automation Control Panels

Many automation cabinets use DC power supplies for PLCs, sensors, and communication equipment. The breaker safeguards these circuits and ensures stable operation of control systems.

Telecommunications Power Distribution

Telecom infrastructure often uses DC power networks for reliability. The breaker protects power distribution units and communication equipment from electrical faults.