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PR121/P-LSI

The Schneider Electric PR121/P-LSI is a low-voltage, three-pole molded case circuit breaker (MCCB) designed for high-current industrial and commercial power distribution. It provides comprehensive protection against overloads, short circuits, and instantaneous faults. The breaker is equipped with an LSI (Long‑Short‑Instantaneous) electronic protection unit, allowing adjustable protection settings for precise coordination and selectivity. It is suitable for both fixed and withdrawable installation in switchboards and distribution panels and complies with international IEC standards for low-voltage circuit protection.

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Specifications General Product Family: PR series Device Type: Molded case circuit breaker (MCCB) Model: PR121/P-LSI Poles: 3‑pole Application: Industrial power distribution protection and isolation Standards Compliance: IEC 60947-2 Control Type: Manual or handle-operated Mounting Mode: Fixed or draw‑out Suitability for Isolation: Yes Electrical Ratings Rated Current (In): 1250 A Rated Operational Voltage (Ue): Up to 690 V AC, 50/60 Hz Rated Insulation Voltage (Ui): 1000 V AC Rated Impulse Withstand Voltage (Uimp): 12 kV Breaking Capacity Class: LSI (adjustable for long-time, short-time, and instantaneous protection) Rated Ultimate Short-Circuit Breaking Capacity (Icu): 50–100 kA (depending on variant) Rated Service Short-Circuit Breaking Capacity (Ics): 100% of Icu Rated Short-Circuit Making Capacity (Icm): High peak short-circuit current capacity Trip Unit Trip Unit Type: LSI (Long‑Short‑Instantaneous) electronic protection Protection Functions: Adjustable long-time, short-time, and instantaneous trip Adjustable Range: Settings configurable to match downstream equipment and coordination requirements Mechanical & Installation Operating Mechanism: Manual ON/OFF Mounting Mode: Fixed or draw‑out Connection Orientation: Standard panel connections Mechanical Durability: High cycle life for frequent operations Environmental Network Frequency: 50/60 Hz Installation Environment: Indoor switchboards and distribution panels Pollution Degree: Suitable for industrial environments