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PR122/P-LSI，1250A

The ABB PR122/P‑LSIG 1250 A is a low‑voltage air circuit breaker (ACB) from ABB’s Emax series, designed for use in industrial and commercial electrical distribution systems. It is rated for a continuous current of 1250 A and features the PR122/P‑LSIG electronic protection trip unit, which offers adjustable long‑time (overload), short‑time, instantaneous, and earth‑fault protection.

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Technical Parameters Parameter Specification Product Name ABB PR122/P‑LSIG 1250 A Air Circuit Breaker Protection Trip Unit PR122/P‑LSIG (electronic) Rated Current (Iₙ) 1250 A Rated Operational Voltage (Uₑ) Up to 690 V AC Rated Uninterrupted Current (Iᵤ) 1250 A Number of Poles 3‑pole (standard configuration) Rated Insulation Voltage (Uᵢ) 1000 V AC Rated Impulse Withstand Voltage (Uₚₘₚ) 12 kV Short‑Circuit Breaking Capacity (Icu) Approx. 65 kA at 400–415 V AC Short‑Time Withstand Current (Icw) ~55 kA for 1 s Overload Release Setting Range 500–1250 A Short‑Time Delay Setting 750 A Instantaneous Release Range 1875–18750 A Protection Functions Adjustable overload (L), short‑time (S), instantaneous (I), and earth‑fault (G) Auxiliary Contacts Yes (typically 4 change‑over) Mounting Types Fixed frame or withdrawable moving part (model dependent) Control & Indicators Breaker position and trip indication Standards Compliance IEC low‑voltage circuit breaker standards Typical Use Protection and switching in industrial/commercial power distribution