SYMAP-BC (commonly written as SYMAP-BCG) is a multifunctional digital relay protection and control unit under StuckeGROUP in Germany. It is designed for medium and low voltage distribution systems and integrates protection, measurement and control, communication, and programmable logic. It is widely used in shipbuilding, industrial, and power scenarios.

1、 Basic Information
Model: SYMAP-BC (Standard Model SYMAP-BCG)
Brand: StuckeGROUP (Germany)
Type: Microcomputer comprehensive protection and measurement device
Applicable voltage: low voltage, medium voltage (≤ 35kV)
Core architecture: Three processor redundancy (ensuring high reliability)
Protection level: Front panel IP40
Installation method: panel type (embedded switch cabinet)
2、 Core protection function (full coverage)
Can activate all protections simultaneously, with no functional limitations:
Feedline/Line: Three section overcurrent, quick break, zero sequence overcurrent, overload, low voltage, reclosing
Electric motor: locked rotor, startup timeout, imbalance/phase loss, grounding, overheating
Transformer: overcurrent, quick break, gas (non electric), temperature, differential (optional)
Generator: overcurrent, overvoltage, undervoltage, overclocking, low-frequency, demagnetization, reverse power
Other: Ground fault, voltage imbalance, frequency monitoring, fault recording (5 groups)
3、 Hardware and Interface
Processor: 3 x high-performance microprocessors (interlock check)
Display: 5.7-inch LCD with buttons and LED status indicators
Measurement: 3-phase voltage/current, power, frequency, harmonics (5th order), energy metering
Switching quantity: Multiple DI (input), DO (output, can control circuit breaker)
Communication interface:
RS232 (programming/frontend)
RS422/485（Modbus RTU）
CANbus (Interlocking/Control)
Ethernet (PROFIBUS DP, IEC 60870-5-103, IEC 61850)
Fiber optic interface (optional)
4、 Key characteristics
Built in PLC: small programmable logic, customizable interlocking and control logic, no need for additional PLC
Circuit breaker management: Control up to 5 circuit breakers with status monitoring, life statistics, and anti trip locking
Fault waveform recording: 5 sets of fault waveforms for easy post analysis
Wide temperature operation: -5 ℃~+70 ℃, suitable for harsh industrial environments
Ship certification: certified by DNV, LR, ABS and other classification societies, applicable to marine engineering/ship power distribution
5、 Typical application scenarios
Ship power system: Main distribution board, generator, engine room feeder protection
Industrial power distribution: Low voltage switchgear and motor control center (MCC) in factories
Power facilities: small power stations, distributed energy, plant power systems
Oil and Gas/Chemical Industry: Key Equipment Protection and Interlocking in Process Control
6、 Technical parameters (simplified)
Working power supply: 12-36VDC or 100-240VAC, 50/60Hz
Accuracy: Current/voltage ± 0.2%, power ± 0.5%
Size: Approximately 144 × 192 × 55mm (panel opening 138 × 186mm)
Weight: Approximately 3.2kg
7、 Model description (naming convention)
SYMAP‑BCG‑XX‑XXX‑XXX
BCG: Basic Type (abbreviated as BC)
XX: Voltage level (such as 400V, 690V, 10kV)
XXX: Protected objects (G=generator, M=motor, F=feeder, T=transformer)
XXX: Communication/Expansion Options