It combines magnetic and electronic trip technology, with a magnetic tripping range of 150...350 A to handle inrush without nuisance trips on starting. Breaking capacity hits 50 kA Icu at 220...240 V AC, tapering to 10 kA Icu at 500 V AC — enough for most low-voltage distribution fault levels downstream of a transformer. The motor power table shows it handles 5.5 kW at 400...415 V and up to 18.5 kW at 660...690 V, so match your motor nameplate to the voltage row.
The GV4LE25B6 is a 3-pole unit in a grey (RAL 7016) enclosure, 155 mm high, 81 mm wide, 116 mm deep. Connection pitch is 27 mm without spreaders, 35 mm with — plan your busbar or lug-ring terminal layout accordingly. Tightening torque is 9 N·m for cable 16...95 mm², 5 N·m for 1.5...10 mm². IK07 impact resistance handles accidental tool drops during commissioning. Operating position is any position, and it's rated for altitudes up to 5000 m — useful for installations in high-altitude plants where air density affects cooling and arc extinction.
Standards compliance covers EN/IEC 60947-4-1 (motor starters) and EN/IEC 60947-2 (circuit breakers), plus suitability for isolation per IEC 60947-1. Climatic withstand conforms to IACS for marine environments. Fire resistance at 960 °C per IEC 60695-2-11.
Durability and thermal management
Mechanical durability is 40,000 cycles; electrical durability for AC-3 at 440 V is 40,000 cycles at half rated current (In/2) and 20,000 cycles at full In. Maximum operating rate is 25 cycles per hour — fine for intermittent motor starting, not for high-speed jogging. Power dissipation is 6.1 W per pole, so at 25 A continuous you're looking at about 18.3 W total heat to vent from the enclosure. Vibration resistance covers ±1 mm at 2...13.2 Hz and 0.7 gn at 13.2...100 Hz per IEC 60068-2-6; shock rating is 15 gn for 11 ms. Ambient operating temperature isn't listed in this spec set, but the continuous duty rating per IEC 60947-4-1 implies standard 40 °C ambient with derating above.