Three-pole Power Circuit Breaker Eti-Polam EB2S 250/3LA 250 A 16 kA with Thermal Adjustment

Eti-Polam EB2S 250/3LA is a three-pole power circuit breaker rated for 250 A nominal current with a 16 kA rated short-circuit breaking capacity and adjustable thermal protection. Designed for industrial and commercial electrical distribution, this breaker provides overcurrent and short-circuit protection with configurable thermal tripping to match conductor and load characteristics. The compact three-pole design fits typical motor feeders, distribution boards and switchgear requiring reliable protection and selective tripping.

Advantages

The breaker combines a high 16 kA breaking capacity with adjustable thermal protection, enabling coordination with upstream and downstream devices and protection of conductors and motors. The three-pole configuration ensures simultaneous disconnection of all phases, reducing the risk of unbalanced faults. Its adjustable thermal element allows setting of tripping thresholds to accommodate varying load profiles while the robust mechanical construction ensures long-term operational stability in demanding environments.

Suitable for

• Protection of three-phase motor feeders and starters
• Incoming and distribution circuits in commercial and industrial panels
• Short-circuit and overcurrent protection in switchboards and control panels
• Applications requiring selective coordination with thermal adjustment

Key specifications

• Poles: three-pole design for three-phase systems
• Rated current: 250 A nominal
• Breaking capacity: 16 kA (short-circuit interruption capability)
• Protection types: overcurrent and short-circuit with adjustable thermal trip
• Thermal adjustment: configurable thermal tripping range for coordination with load and conductors
• Mounting: panel/switchboard mounting compatible with standard three-pole installations

How to use

Install the breaker in the distribution board or switchgear following local electrical codes and the equipment manufacturer's installation instructions. Connect the three-phase supply and load conductors to the corresponding terminals, ensuring secure tightness and correct torque values for terminals. Set the thermal adjustment according to conductor ampacity and motor starting characteristics to achieve proper tripping coordination. Verify correct operation by performing functional tests under de-energized conditions and by testing protection settings with qualified personnel before putting the circuit into service.

Usage recommendations

Regularly inspect terminal connections for tightness and signs of overheating, and verify thermal adjustment settings after significant load changes. Use coordinated upstream and downstream protection to maintain selectivity, and schedule periodic functional testing and maintenance in accordance with applicable standards to ensure continued reliable operation.