Circuit breaker 3-pole ETI C-25AE 6 kA Type C, 25 A

The Circuit breaker 3-pole ETI C-25AE 6 kA Type C, 25 A is a three-pole miniature circuit breaker designed for DIN-rail electrical distribution and overcurrent protection in residential and light-commercial installations. It provides a rated continuous current of 25 A and a breaking capacity of 6 kA, with a Type C tripping characteristic that balances sensitivity to overloads and tolerance for moderate inrush currents from lighting and motor loads.

Advantages

The ETI C-25AE combines compact three-pole protection with a 6 kA short-circuit breaking capability, enabling coordinated protection across three-phase circuits while occupying minimal panel space. The Type C characteristic reduces nuisance tripping on circuits with moderate start-up currents, and the stable thermal-magnetic tripping mechanism offers reliable, repeatable operation under typical load conditions.

Suitable for

• Three-phase lighting circuits in residential and commercial buildings
• Socket outlets and general-purpose three-phase distribution
• Small motors, pumps and HVAC units with moderate inrush currents
• DIN-rail distribution boards and consumer units

When it may not be suitable

This breaker may not be suitable for installations that require higher short-circuit breaking capacity than 6 kA or where selective coordination with upstream protection requires different characteristics. It is not intended for use as a main incomer in large industrial installations with very high prospective fault currents.

Key specifications

• Poles: 3 (three-pole)
• Rated current: 25 A
• Tripping characteristic: Type C (thermal-magnetic)
• Breaking capacity: 6 kA (short-circuit breaking capacity)
• Mounting: DIN-rail compatible
• Application: Overcurrent protection for three-phase circuits

How to use

Install the three-pole breaker onto a standard DIN-rail inside the distribution board, ensuring correct orientation and secure fastening. Connect the incoming three-phase supply to the line terminals and the load conductors to the load terminals, following local wiring regulations and torque recommendations for terminal screws. Use the breaker as the branch or circuit protection device for the intended load; in case of overload or short circuit the thermal-magnetic mechanism will trip and isolate the circuit. After fault clearance, reset the breaker by switching it back to the ON position.

What to consider before purchase

• Ensure the rated current of 25 A matches the load requirements and conductor sizing
• Verify that 6 kA breaking capacity is sufficient for the installation's prospective fault current
• Confirm Type C tripping is appropriate for equipment with moderate inrush currents
• Check compatibility with the existing DIN-rail distribution board and available panel space

Usage recommendations

For reliable protection, match the breaker rating to conductor size and perform coordination checks with upstream protection. Periodically inspect connections for tightness and signs of overheating, and replace the device if mechanical damage or signs of wear are observed.