Product Short Description
Product Overview
Manufactured by Bender GmbH & Co. KG, Germany, the RCM475LY-13 is an industrial-grade residual current monitoring device compliant with Type B classification under IEC 60755. It continuously tracks AC, pulsating DC and smooth DC residual ground fault currents within TN and TT grounded power distribution systems. Unlike residual current circuit breakers that cut power immediately upon fault detection, this monitor delivers early pre-fault alarm signals to control systems, enabling planned maintenance before equipment damage or electric shock hazards occur.
Description
Measuring Circuit Parameters
- Residual current detection range: 6 mA – 10 A stepless continuous adjustment
- Compatible current waveform: AC sine wave, half-wave pulsating DC, full-wave smooth DC
- Supported frequency bandwidth: 0 Hz – 700 Hz
- Internal measuring current transformer inner diameter: 18 mm
- Measuring principle: Summation vector detection of all live circuit conductors excluding PE wire
Auxiliary Power Supply
- Universal input voltage range: 24 V – 240 V AC/DC wide-range compatibility
- Maximum total power consumption under full load: ≤ 8 VA
Alarm Output Relay Specifications
- Switching contact configuration: 1 set of voltage-free DPDT Form-C changeover contacts
- Rated contact voltage capacity: AC 250 V / DC 300 V
- Rated continuous carrying current: 5 A resistive load
- Breaking capacity at cosφ=0.4: 2 A AC 230 V
- Mechanical service cycle life: Minimum 12,000 switching operations
Timing & Threshold Configuration
- Alarm response delay adjustment range: 0 s – 10 s continuous stepless setting
- Fault memory modes: Latching alarm retention / Non-latching automatic reset
- Operation mode selection: Normally energized relay state / Normally de-energized relay state
Environmental & Mechanical Performance
- Rated operating ambient temperature: -25 °C ~ +70 °C
- Long-term storage temperature range: -40 °C ~ +75 °C
- Climate compliance grade: DIN IEC 60721-3-3 Class 3K5
- Vibration resistance during operation: 1 g acceleration, frequency band 10 Hz – 150 Hz
- Shock resistance during operation: 15 g peak acceleration, pulse duration 11 ms
- Transportation bump resistance: 40 g peak acceleration, pulse duration 6 ms
- Overall unit net weight: ≤ 350 g
- External overall dimensions: 99 mm Width × 91 mm Height × 45 mm Depth
Compliance & Certification Standards
- IEC 60755 Type B residual current detection classification
- EN 61543 electromagnetic compatibility immunity standard
- EN 61000-6-4 industrial electromagnetic emission standard
- UL 61010 laboratory measurement equipment safety certification
- CE marking for European industrial electrical equipment
- UL94-V0 flame retardant housing material certification
Core Function Features
Full AC/DC Residual Current Detection Capability
The device’s Type B detection circuit accurately identifies all forms of ground fault leakage current, including low-frequency smooth DC generated by frequency converters, UPS power supplies, rectifier battery chargers and variable frequency motor drives. No external auxiliary transformers are required for mixed AC/DC load circuits.
Adjustable Anti-Nuisance Tripping Time Delay
0 to 10 seconds fully configurable alarm delay eliminates false alarm triggers caused by transient switching surges, capacitive charging currents of long cable harnesses and temporary equipment startup leakage peaks. Users calibrate delay values according to on-site load characteristics to balance fault response speed and operational stability.
Dual Configurable Fault Memory Operation Modes
- Latching mode: Alarm relay contact state remains locked after ground fault clearance; manual reset via front panel button or external reset signal is mandatory to restore normal monitoring state.
- Non-latching mode: Relay contacts automatically reset to original state once measured residual current drops below the preset response threshold, suitable for automatic circulating monitoring loops.
Independent selection of normally energized or normally de-energized relay base state enables flexible integration with PLC input modules, audible buzzers and warning beacon light circuits.
Integrated Visual Status Indication System
- Multi-segment LED bar graph: Real-time visual display of measured residual current as a percentage scale of the user-set alarm threshold (0% – 100%).
- Independent dedicated LED indicators: Power supply operation status light, ground fault alarm trigger light, extraneous stray voltage warning light.
- Sealable transparent protective front cover for all adjustment potentiometers and operation buttons, preventing unauthorized parameter tampering in public or unattended electrical control cabinets.
Built-In Test & Reset Operating Interface
Combined TEST / RESET tactile button installed on the front panel, supporting two independent functional operations:
- TEST function: Simulates artificial residual fault current to fully verify the complete measurement circuit, signal processing logic and alarm relay output without disconnecting on-site power load wiring.
- RESET function: Clears latching fault memory state and extinguishes all fault indication LEDs after fault troubleshooting completion.
External remote test and reset signal terminals are reserved on the wiring base for centralized cabinet control panel operation integration.
External Measuring Instrument Output Terminal
Galvanically isolated signal output port compatible with external analog panel meters, data acquisition transducers and secondary monitoring display units. Output signal specification: DC 0 μA – 400 μA driving current, maximum connected load impedance 12.5 kΩ, maximum allowable external measuring cable total length 10 meters without signal attenuation.
Comprehensive Built-In Self-Monitoring Circuit
Continuous background self-diagnosis runs parallel to normal residual current measurement, automatically detecting internal power supply voltage anomalies, measuring transformer open-circuit faults, front panel button circuit failures and extraneous stray voltage intrusion into the internal measuring circuit. All abnormal self-check results trigger dedicated warning LED indication without interrupting primary ground fault monitoring functionality.
Reviews
There are no reviews yet.