Motor protection circuit breaker with overload relay function
The 3RV2131-4KA10: Breaking capacity is rated at 30 kA at 400 V, which means it can safely interrupt a fault current of up to 30,000 amperes at that voltage without welding its contacts or cascading failure upstream. Any mounting position is permitted. The enclosure dimensions are 149 mm deep, 75 mm wide, and 140 mm high — a standard SIRIUS frame that fits alongside other 3RV2 components in a motor control center.
Clearance and spacing requirements
At 400 V, the required clearance is 160 mm — this is the arc-flash boundary for safe operation, not the physical gap to the next device. At 240 V no clearance is required. Terminals accept 2x (1 to 35 mm²) or 1x (1 to 50 mm²) solid or stranded copper. Strip length per standard practice — the datasheet specifies the range.
Environmental and operating limits
Storage and transport range extends from -50 to +80 °C. The rated voltage range is 20 to 690 V. Maximum switching frequency under AC-3 duty is 15 operations per hour. The part is rated for 22 kW at 230 V and 25 hp at 220/230 V, per the listed power ratings.