The RCM470YM2 is a Type A residual current monitor from Bender, designed for earthed systems (TN and TT systems). It measures residual current non‑invasively via an external measuring current transformer. When an earth fault is detected, the device triggers an alarm without disconnecting the power supply, effectively preventing nuisance tripping. This model features two independent alarm outputs.
Technical Specifications
· Response values: AC 30 mA (fixed) / 10…80% × IΔ² (adjustable), overall range 10 mA…10 A
· Supply voltage: AC 230 V, 50/60 Hz
· Power consumption: 3.0 VA
· Relay contacts: AC 250 V / 5 A
· Data sheet: 401005
Key Features
· Two independent alarm stages: Alarm 1 fixed at 30 mA; Alarm 2 adjustable from 10 mA to 10 A (stepless) with response delay 0…10 s
· External measuring current transformer – measurement largely unaffected by load current and system voltage
· LED bar graph shows measured value as percentage of set value (0…1000 mA / 0…10 A)
· Built‑in TEST/RESET button, supports external push‑buttons for remote operation
· Transformer connection monitoring – alarms on wire break
· Selectable fault memory (latching / non‑latching)
· Sealable transparent cover prevents unauthorised parameter changes
Typical Applications
· Residual current monitoring in earthed systems (TN/TT systems)
· Socket outlet circuits for permanently unattended equipment (air conditioning, EDP systems)
· Alarm systems, safety devices
· Cooling equipment, canteen kitchens
· Motor control systems, generators
· Off‑line single‑conductor current monitoring (PE, N conductors)
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