Siemens 3RR2143-3AA30 Analog Current Monitoring Relay | 24V AC/DC

The Siemens 3RR2143-3AA30 is an analog monitoring relay designed for direct mounting onto Siemens 3RT2 contactors of size S2. It offers basic adjustment for apparent current monitoring within a range of 8 to 80 Amperes, operating on 50 to 60 Hz frequencies with a 24V AC/DC supply. The relay features one change-over (CO) contact and provides monitoring for current overshoot and undershoot, phase failure, and cable break, with or without a fault buffer. It includes adjustable ON delay (0-60s) and noise pulse suppression (0-30s), with a switching hysteresis of 6%. The connection system is spring-type.

This monitoring relay is essential for protecting electrical equipment and ensuring operational integrity by detecting abnormal current conditions. It is widely used in motor control applications, pump systems, conveyor belts, and other industrial machinery where precise current monitoring is critical for preventing damage and downtime.

Stanlo Automation, a veteran-owned surplus distributor, is your trusted source for industrial automation components. We stock parts like the Siemens 3RR2143-3AA30, ensuring you can quickly source the necessary equipment to maintain your systems efficiently and cost-effectively.