Residual current monitoring system LINETRAXX® RCMS150

alarmModbusRS-485

Overview
The six-channel LINETRAXX® RCMS150 residual current monitors are AC/DC sensitive (type B) devices for measuring AC and DC fault (residual) currents in earthed power supplies. They measure residual currents up to IΔ = 500 mA in the frequency range DC…2 kHz and are suitable for monitoring final circuits with up to 32 A load current and a monitored-circuit voltage of 300 V. Each channel provides two separately adjustable response thresholds to distinguish prewarning and alarm. Measured values and alarm states can be transferred and parameters configured via RS-485.

Key capabilities

• Continuous residual current monitoring as an alternative to periodic insulation testing
• AC/DC sensitive measured-value acquisition (Type B) with 6 channels (K1…K6)
• Pure DC fault evaluation supported
• Compact design for confined installation spaces
• RS-485 interface with Modbus RTU or BMS protocol for data transfer and visualization
• Configuration and measured-value/alarm transfer via RS-485

Features

• Monitoring range for residual current IΔ up to 500 mA; frequency range DC…2 kHz
• Each channel provides 2 measuring channels: 1 × RMS and 1 × DC
• Two independently adjustable thresholds per channel (prewarning + alarm)
• Continuous self-monitoring and fully shielded measuring current transformers to reduce magnetic interference
• DIN-rail or screw mounting for standard distribution panels
• Compatible with Bender gateways (e.g. COM465IP, CP9…)

Interfaces & Variants

• RCMS150: RS-485 interface with BMS protocol. Address range 2…90 (device). Up to 89 devices on one bus.
• RCMS150-01: RS-485 interface with Modbus RTU. Address range 1…99 via potentiometers on device; 1…247 via bus. Up to 247 devices on one bus.

Applications

• Continuous measurement and monitoring of AC and DC fault currents up to IΔ = 500 mA (DC 0…2 kHz)
• Monitoring final circuits rated up to 300 V and load currents up to 32 A
• Suitable for installations with limited space and for integration into building or plant monitoring systems
• Operation permitted up to 2000 m above mean sea level

Variants
RCMS150 | DC 24 V | BMS | B94053025
RCMS150-01 | DC 24 V | Modbus RTU | B94053026
RCMS150-W-01 | DC 24 V | Modbus RTU | B94053026W

Optional accessories
Mounting clip for DIN rail mounting — B91080110
Condition Monitor with integrated gateway (COM465IP / CP907-I variants) — B95061065 / B95061031 / B95061032
RS-485 repeater DI-1DL — B95012047
Residual current monitoring system* (RCMS460/RCMS490 variants) — B94053001 / B94053002 / B94053005 / B94053006
*In this case no condition monitor/gateway is necessary; suitable for measured-value and alarm indication only, not for parameter setting.

Technical specifications

• Type: AC/DC sensitive residual current monitor (Type B), LINETRAXX® RCMS150 series
• Channels: 6 (K1…K6), each with 2 measuring channels (1 × RMS, 1 × DC)
• Measuring range IΔ: up to 500 mA; frequency range DC…2 kHz
• Monitored circuit rated voltage: 300 V; max. load current per monitored circuit: 32 A
• Supply voltage: DC 24 V
• Interfaces: RS-485 (BMS or Modbus RTU depending on variant)
• Adjustable: 2 response thresholds per channel (prewarning + alarm)
• Addressing: RCMS150: 2…90 (up to 89 devices on bus); RCMS150-01: 1…99 via potentiometers / 1…247 via bus (up to 247 devices)
• Mounting: DIN-rail or screw mounting
• Continuous self-test and fully shielded measuring current transformers
• Operating altitude: up to 2000 m above mean sea level