Microprocessor based overload relay - 3RB (Class 20E) - 3RB3016-2PB0

Product Description

Siemens 3RB3016-2PB0 Electronic Overload Relay – Class 20E Motor Protection for Heavy Starting Loads

The Siemens 3RB3016-2PB0 Electronic Overload Relay is a high-performance microprocessor-based motor protection device from the trusted SIRIUS 3RB3 series, engineered to provide reliable protection against overload, phase failure, and phase imbalance in three-phase motors. Designed for industrial automation and motor control applications, this advanced electronic overload relay offers precise inverse-time delayed protection while helping extend motor life and reduce maintenance costs. The relay features a 1A to 4A adjustable current range, Class 20E tripping characteristic, and compact Size S00 construction, making it ideal for motors with heavy starting requirements.

Unlike conventional thermal overload relays that use bimetallic elements, the 3RB3016-2PB0 utilizes electronic current sensing and microprocessor-controlled evaluation. This intelligent protection technology continuously monitors motor current and thermal conditions, delivering highly accurate overload protection and improved repeatability. By detecting abnormal operating conditions before excessive heat can damage motor windings, the relay helps improve equipment reliability and minimize unexpected downtime.

A key advantage of the Siemens 3RB3016-2PB0 is its Class 20E tripping characteristic, specifically designed for motors that experience extended acceleration times or heavy starting loads. Applications such as conveyors, mixers, compressors, pumps, crushers, and material handling equipment often require longer startup periods. The Class 20E protection characteristic allows motors to start normally while still providing dependable protection against sustained overload conditions.

The relay provides an adjustable current setting range of 1A to 4A, making it suitable for protecting smaller industrial motors and specialized machinery. Siemens electronic overload relays provide inverse-time delayed protection that closely matches motor thermal characteristics, ensuring accurate protection while minimizing nuisance tripping during startup conditions.

Integrated phase failure and phase imbalance protection continuously monitor all three motor phases. If a phase is lost or significant imbalance occurs, the relay automatically disconnects the motor before overheating and winding damage can occur. This proactive protection significantly increases motor reliability and helps reduce costly equipment failures.

The 3RB3016-2PB0 is designed for direct mounting onto compatible Siemens 3RT2015 to 3RT2018 Size S00 contactors, creating a compact and efficient motor starter assembly. Durable screw-type terminals for both the main and auxiliary circuits ensure secure electrical connections and long-term reliability in industrial environments.

For monitoring and control purposes, the relay includes 1 Normally Open (1NO) and 1 Normally Closed (1NC) auxiliary contacts. These contacts can be used for overload trip indication, PLC interfacing, alarm signaling, remote diagnostics, and control circuit interruption. This functionality improves system visibility while simplifying control panel wiring.

The relay supports both manual and automatic reset functions, allowing users to select the most suitable reset method for their application. Automatic reset helps reduce downtime in automated systems, while manual reset provides additional safety where operator verification is required before restarting equipment.

Built according to IEC 60947-4-1 standards, the Siemens 3RB3016-2PB0 Electronic Overload Relay offers dependable performance across demanding industrial environments. Its compact design, advanced protection features, and Siemens reliability make it ideal for manufacturing plants, HVAC systems, water treatment facilities, packaging machinery, food processing equipment, and industrial automation projects.