Stucke Elektronik SYMAP®M motor protection

SYMAP® M (Motor Protection) is a dedicated digital protection relay from Stucke Elektronik designed specifically for the protection, control, and monitoring of high-stakes electric motors.

1 It is widely used for large asynchronous (induction) and synchronous motors in industrial and marine environments.

1. Product Description

SYMAP® M is a multifunctional, microprocessor-based relay that provides comprehensive protection against mechanical and electrical stress.

2 Unlike standard motor starters, SYMAP® M monitors complex thermal images of the motor, protects against stalled rotors, and manages frequent starting cycles. 

It integrates protection, measurement, and control (including star-delta or autotransformer starting logic) into a single, rugged unit.3

2. Technical Parameter Table

3. Related Models

The SYMAP® M series includes variants based on motor size and voltage:

SYMAP® M (Standard): Focused on current-based protection for LV/MV motors.

SYMAP® M-V: Adds voltage and frequency monitoring for sensitive motor applications.

SYMAP® M-Diff: Includes Motor Differential Protection (87M) for high-voltage motors to detect internal phase-to-phase faults.

SYMAP® M-Compact: A space-saving version for integration into smaller Motor Control Centers (MCC).

4. Application Cases

Marine Propulsion & Thrusters: Protecting the massive electric motors used for ship maneuvering and main propulsion.

Heavy Industry Pumps & Fans: Used in water treatment plants, cooling towers, and mine ventilation systems.

Compressors: Protection for large-scale industrial air or gas compressors in the Oil & Gas sector.

Conveyor Systems: Managing the high-torque start-up phase and overload protection for mining conveyors.

5. Product Advantages and Features

Advanced Thermal Modeling: Calculates the motor's "Thermal Image" in real-time to prevent overheating while allowing maximum operational flexibility.

Comprehensive Start-up Monitoring: Specifically monitors the number of starts and the time between starts to prevent insulation degradation.

Integrated Control: Can replace external timing relays and small PLCs by managing the entire starting sequence (e.g., controlling the main, star, and delta contactors).

Fault Diagnostics: Records the "Trip Profile," allowing technicians to see exactly what the current and voltage were at the millisecond of the fault.

Safety & Redundancy: Built with the Stucke 3-CPU architecture for fail-safe operation in critical environments.4

6. Other Models in the Same Series

SYMAP® is a modular platform covering the entire power distribution board:5

SYMAP® G: Generator Protection.

SYMAP® EC / ECG: Engine Control and integrated Generator Protection.

SYMAP® F: Feeder Protection for distribution lines.

SYMAP® BC: Bus-tie Control for managing busbar segments.

SYMAP® T: Transformer Protection.