Technical Parameters
Parameter Specification
Product Name ABB S7S1250 PR211/P‑LI FF 4P MCCB
Product Type Low‑Voltage Molded‑Case Circuit Breaker (MCCB)
Series / Family Isomax S7
Protection Trip Unit PR211/P‑LI (electronic long‑time & instantaneous)
Rated Current (Iₙ) 1250 A
Number of Poles 4 (3 phases + neutral)
Mounting Type Fixed (Front‑Fixed – FF)
Rated Operational Voltage (Uₑ) Up to 690 V AC
Rated Insulation Voltage (Uᵢ) 1000 V AC
Rated Impulse Withstand Voltage (Uᵢₘₚ) 8–12 kV (typical for MCCBs)
Adjustable Protection Functions Overload (long‑time), Short‑circuit (instantaneous)
Trip Unit Feature LI (Long‑Time + Instantaneous protection)
Short‑Circuit Breaking Capacity High capacity suited for industrial distribution (frame dependent)
Auxiliary Contacts Optional / configurable
Control & Indicators Breaker position and trip indication
Standards Compliance IEC 60947‑2 (low‑voltage circuit breakers)
Typical Use Main feeder protection or branch circuit protection in industrial and commercial distribution systems
The ABB S7S1250 PR211/P‑LI FF 4P is a low‑voltage molded‑case circuit breaker (MCCB) designed for industrial and commercial electrical power distribution. It is built on ABB’s Isomax S7 frame, engineered to provide reliable protection and switching for three‑phase power systems with neutral (4‑pole), and a continuous rated current of 1250 A.