It carries 55 A at 415 V in that duty — meaning it handles resistive heating, lighting, or other non-inductive loads up to that current. For motor or inductive loads you would need an AC-3 rated contactor; this one is sized for the simpler thermal load profile.
Standards and environmental limits
The protective treatment (TH) meets pollution degree 3 per IEC 60068, so it tolerates moderate industrial atmospheres — think panel air with some dust and humidity, not clean-room conditions. Operates between -5 °C and +55 °C ambient, stores from -60 °C to +80 °C. Altitude limit is 3000 m — fine for most sites; above that derating applies.
Physical fit
Dimensions: 93 mm deep, 56 mm wide, 64 mm tall. The 56 mm width leaves room alongside other devices in a multi-row enclosure.