The RCM410R-24 is a single‑channel residual current monitor from Bender, designed for earthed systems (TN and TT systems). It continuously monitors residual currents (earth fault currents) in AC systems and triggers an alarm when a preset threshold is reached, without disconnecting the power supply. It is suitable for predictive maintenance and electrical safety monitoring in critical infrastructure. This version is powered by a DC 24 V supply and is a Type A residual current monitor (sensitive to AC and pulsating DC currents), complying with IEC 62020‑1.
Technical Specifications
· Rated residual operating current (IΔn): 10 mA … 30 A (42…70 Hz)
· Measuring range: Peak 2 mA … 70 A; RMS 2 mA … 50 A
· Pre‑warning value (AL1): Adjustable from 50…100 % of IΔn
· Response time: ≤ 250 ms at IΔn; ≤ 100 ms at 5 × IΔn
· Adjustable time delays: Start‑up delay (0…999 s), response delay (0…10 s), release delay (0…999 s)
· Measuring principle: True RMS
· Frequency range: 42…70 Hz
· Supply voltage (Uₛ): DC 24 V (–30 % / +25 %)
· Power consumption: ≤ 2 W
· Alarm output: One alarm relay (changeover contact), configurable N.O./N.C. and fault memory
· Communication interface: RS‑485, Modbus RTU protocol
· Configuration: Potentiometers on device + NFC (Bender Connect App)
· Operating temperature: –25 °C … +55 °C
· Width: 18 mm
· Protection class: Housing IP30, terminals IP20
· Standards compliance: IEC 62020‑1
· Order number: B74602000
Key Features
· Type A residual current monitoring (sensitive to AC and pulsating DC)
· True RMS measurement for harmonic‑rich systems
· Two‑stage alarm: pre‑warning (AL1) and main alarm (IΔn)
· LED bar graph for real‑time residual current display
· Adjustable time delays to prevent nuisance tripping
· RS‑485 / Modbus RTU communication
· NFC smartphone configuration (Bender Connect App)
· Continuous transformer connection monitoring
· Compact design (18 mm width)
Typical Applications
· Residual current monitoring in TN/TT systems
· Stray current monitoring
· Central earthing point (CEP) monitoring
· Off‑line current monitoring of single conductors (PE, N‑PE, etc.)
· Earth fault pre‑warning in UPS systems, data centres, hospitals and other critical facilities
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