RESIDUAL CURRENT MONITORING MODULE
The AXM-IO4 expands Acuvim II, Acuvim L, and Acuvim 3 series meters with residual current monitoring and temperature inputs. It supports multi-type residual current sensors, including type B and F to detect leakage current across a range of electrical loads. Temperature sensors, including RTD PT100 and PT1000 for equipment monitoring.
- Two independent RCM channels with a measurement range from 0-30 mA AC and 0-20 mA DC or 4-20 mA DC.
- Two temperature inputs using PT100, PT1000, and KTY83, and KTY84 sensor types.
- RCM accuracy Class 1 IEC 61557-1 (I ≥ 0.5 mA)
- RTD accuracy up to ±1.5% FS temperature range
- Supports type A, type AC, type F, and type B for residual current monitoring applications with 1µA resolution and 8kHz sampling.
- Compliant to IEC 61000-4-2/3/4/5/6/8/11 standard for electromagnetic compatibility
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AXM-IO4 Overview
Residual Current Monitoring Inputs
RCM is used for early detection of abnormal residual currents associated with insulation aging in wires to avoid short circuit conditions. It supports compatible external residual current sensors for AC and DC monitoring, including Type A, Type F, and Type B applications, depending on select sensor configuration.
Temperature Monitoring Inputs
The RTD temperature sensor allows the monitoring of switchboards, transformers, motors, cable terminations, and other critical equipment. Two-wire temperature inputs support platinum-based PT100, PT1000, and silicon-based KTY83, KTY84 sensors.
AXM I/O Models
AXM-IO4 Product Map
AXM-IO4 Application
Predictive Maintenance and Safety Monitoring
The AXM-IO4 integrates with the Acuvim meter for electrical safety and thermal monitoring in industrial applications. The module connects to residual current and temperature sensors for continuous monitoring of distribution panels, solar systems, EV chargers, and HVAC equipment. Data can be tracked through continuous logging for condition monitoring, predictive maintenance, and system analysis.
AXM-IO4 FAQ
What are the benefits of residual current monitoring?
RCM detect insulation degradation, wiring faults, and current leakage before it becomes a safety hazard leading to unexpected downtime. Continuous monitoring supports predictive maintenance and improves electrical system reliability.
Can the AXM-IO4 generate alarms?
Yes. Residual current and temperature thresholds can be monitored through the connected Acuvim II, Acuvim L, and Acuvim 3 power meter when user-defined limits are exceeded. This helps operators identify developing issues before they become critical.
Does the AXM-IO4 replace a dedicated residual current monitor?
The AXM-IO4 integrates residual current and temperature monitoring within the Accuenergy metering platform, eliminating the need for separate monitoring devices and consolidating measurements, alarms, communications, and data logging into a single system.
What is the difference between residual current monitoring and ground fault protection?
RCM continuously measures leakage current and provides early warning when insulation degradation or leakage begins to develop.
Ground Fault Protection (GFP) is a protective function designed to disconnect power when leakage reaches a predefined trip level.
The AXM-IO4 is intended for continuous monitoring and predictive maintenance, helping identify issues before protective devices operate.
How to choose the correct residual current sensor?
The appropriate sensor depends on the application and the type of leakage current.
- Type AC – Pure AC residual currents
- Type A – AC and pulsating DC residual currents
- Type F – Variable-frequency drives and inverter applications
- Type B – Smooth DC and mixed-frequency leakage currents, commonly used in EV charging, renewable energy, UPS systems, and industrial power electronics
Selecting the correct sensor ensures accurate measurement and compliance with applicable electrical standards.
How is the AXM-IO4 configured?
The AXM-IO4 is configured through the connected Acuvim II, Acuvim L, and Acuvim 3 power meter using its display, web interface, or configuration software.
Does the AXM-IO4 require a separate power supply?
No. The AXM-IO4 is powered through the compatible Acuvim meter, simplifying installation and reducing wiring requirements.
How many AXM-IO modules can be attached to a meter simultaneously?
A maximum of three AXM-IO modules can be attached to a single meter. For the AXM-IO4, only one module can be installed per meter, while up to two of the same AXM-IO1, AXM-IO2, or AXM-IO3 modules can be installed.