The RCMS490-D-2 is a 12-channel residual current monitor designed for earthed systems (TN and TT systems) to monitor residual currents and fault currents in AC, DC and AC/DC hybrid systems. The device performs non‑invasive measurements via external measuring current transformers and provides early warning when ground faults are detected. It complies with IEC 62020 and IEC 61557‑9 standards.
Technical Specifications
· Order No.: B94053006
· Supply voltage: DC 70…276 V; AC 70…276 V, 42…460 Hz
· Measuring channels: 12 channels/device
· Measuring principle: Pulsating DC sensitive (AC sensitive or AC/DC sensitive can be achieved by selecting different current transformers)
· Response ranges:
· AC/DC sensitive (0…2000 Hz): 10 mA…10 A
· Pulsating DC sensitive (42…2000 Hz): 6 mA…20 A
· Pre-warning value: 10…100%, min. 5 mA
· Response time: at IΔ = 1 × IΔn₂ ≤ 180 ms; at IΔ = 5 × IΔn₂ ≤ 30 ms
· Alarm outputs:
· 2 common alarm relays (changeover contacts)
· 12 independent channel alarm contacts (12 × 1 N/O contact)
· Adjustable time delays: Start-up delay 0…99 s, response delay 0…999 s
· Display: Backlit graphical LC display (7-segment display)
· Communication interface: RS‑485, supports BMS protocol and Modbus RTU
· History memory: 300 data records with date and time stamp
· Data logger: 300 data records per channel
· Harmonics analysis: Supports harmonics analysis, DC component analysis, total harmonic distortion (THD) analysis
· Mounting: 35 mm DIN rail mounting
· Protection class: Internal components IP30, terminals IP20
· Standards compliance: IEC 62020, IEC 61557‑9
Key Features
· 12 independent measuring channels: Monitors 12 separate circuits per device, each channel with its own alarm contact for quick fault location
· Flexible measurement type: Each channel can be independently configured as AC sensitive, pulsating DC sensitive or AC/DC fully current sensitive by selecting the appropriate measuring current transformer
· True RMS measurement: Ensures measurement accuracy even in harmonic-rich environments
· High scalability: Up to 90 RCMS monitors can be connected via the BMS bus, expanding to 1080 measuring channels
· Fast parallel scanning: All channels are scanned in parallel for rapid response
· History memory and data logger: Built-in history memory stores 300 time-stamped event records; data logger stores 300 measurement records per channel
· Harmonics analysis: Supports harmonics analysis, DC component analysis and total harmonic distortion (THD) analysis
· Continuous CT connection monitoring: Continuously monitors external current transformer connection status; alarms immediately on wire break
· Password protection: Prevents unauthorised parameter changes
· Preset function: Supports quick commissioning with preset function
Typical Applications
· Residual current monitoring in earthed systems (TN/TT systems)
· Residual current monitoring in fire‑hazard locations – monitors leakage currents that may cause fire
· Data centres – monitoring leakage currents in server racks to prevent unexpected shutdowns
· Medical locations – monitoring electrical safety in medical facilities
· Industrial automation – leakage monitoring on production line electrical systems
· Crane and lifting technology – earth fault monitoring for equipment
· Robotic welding systems – residual current monitoring for medium-frequency welding systems
· N‑conductor overload monitoring – monitors neutral conductor overload caused by harmonics
· PE conductor and equipotential bonding conductor current monitoring
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