Description

The CCC PSMU-350-3 is a high-accuracy, multifunctional three-phase power and energy monitoring unit developed by Control Concepts Corporation (CCC) for industrial, commercial, and infrastructure applications requiring comprehensive electrical parameter measurement and power quality insight. As a core component in modern energy management and building automation systems, the CCC PSMU-350-3 continuously measures over 50 electrical parameters—including phase voltage, line current, active/reactive/apparent power, power factor, frequency, harmonic distortion (up to 51st order), and cumulative kWh/kVArh—with Class 0.5 accuracy per IEC 62053 standards.

Designed for integration into switchgear panels, motor control centers, and substation RTUs, the CCC PSMU-350-3 supports both Modbus RTU (RS-485) and optional Modbus TCP (Ethernet) communication, enabling seamless data exchange with PLCs, HMIs, SCADA platforms, and cloud-based energy dashboards. Its compact DIN-rail form factor, wide operating voltage range, and robust EMC immunity make it suitable for harsh electrical environments. The CCC PSMU-350-3 also features configurable digital inputs/outputs for alarm signaling, demand reset, or external control, transforming raw electrical data into actionable intelligence for predictive maintenance and operational efficiency.

Technical Specifications

Main Features and Advantages

Comprehensive power quality and energy monitoring:
The PSMU-350-3 goes beyond basic metering by providing real-time analysis of voltage sags/swells, current unbalance, and harmonic distortion—key indicators of equipment stress or grid instability. This enables early detection of issues like capacitor bank failure or transformer overload before they cause downtime.

High-accuracy, multi-parameter measurement:
With Class 0.5 accuracy across all key parameters, the PSMU-350-3 meets revenue-grade billing standards in many jurisdictions. It calculates true RMS values even under distorted waveforms, ensuring reliable energy accounting for cost allocation or sustainability reporting.

Flexible communication and system integration:
Standard RS-485 Modbus RTU allows direct connection to Rockwell, Siemens, or Schneider PLCs, while the optional Ethernet port enables IT-friendly integration into BACnet/IP or OPC UA ecosystems. All measured data is mapped to standard Modbus registers, simplifying configuration in third-party software.

Configurable alarming and control logic:
The two relay outputs on the PSMU-350-3 can be triggered by user-defined thresholds—for example, activating a cooling fan when temperature-derived current exceeds limits or sending a fault signal to a central alarm panel. Digital inputs support remote reset or tariff switching.

Compact, rugged design for industrial use:
Despite its rich feature set, the PSMU-350-3 fits in tight panel spaces thanks to its narrow 72 mm width. It complies with IEC 61000-4 EMC standards for surge, ESD, and fast transients, ensuring stable operation near VFDs, welders, or large contactors.

Application Field

The PSMU-350-3 is widely used in industrial facilities for submetering production lines, enabling granular energy cost tracking and identification of inefficient machinery. In data centers, it monitors PDU-level power consumption and power factor to optimize UPS loading and avoid utility penalties. Its harmonic analysis capability helps prevent overheating in neutral conductors caused by server SMPS loads.

In commercial buildings, the PSMU-350-3 integrates into BAS (Building Automation Systems) to provide real-time feedback for HVAC and lighting optimization. Facility managers use its demand data to implement load-shedding strategies during peak tariff periods, reducing electricity bills by 10–20%.

For renewable energy installations, such as solar farms or biogas plants, the PSMU-350-3 verifies grid compliance by monitoring voltage THD and reactive power injection. Its event logging captures transient disturbances that could affect inverter performance or trigger anti-islanding protection.

Finally, in infrastructure projects like airports, hospitals, and railways, the PSMU-350-3 ensures critical power systems remain within operational limits. Its wide voltage tolerance and robust construction make it ideal for regions with unstable grids, while its long-term data logging supports forensic analysis after outages.

Related Products

• PSMU-350-1: Single-phase version of the same platform; suitable for branch circuit monitoring

• PSMU-350-3-E: Enhanced variant with built-in Ethernet (Modbus TCP) and expanded memory for trend logging

• CT-5A-XXX: External current transformers (5 A output); required for PSMU-350-3 current sensing

• EM6400: Competitor product from Schneider; PSMU-350-3 offers better harmonic resolution at lower cost

• PSMU-200 Series: Entry-level CCC meters; PSMU-350-3 adds harmonic analysis, relays, and higher accuracy

• Gateway-Modbus-Ethernet: Protocol converter; useful if integrating PSMU-350-3 into non-Modbus networks

Installation and Maintenance

Pre-installation preparation: Mount the PSMU-350-3 on a standard 35 mm DIN rail inside a grounded enclosure rated for the installation environment. Connect phase and neutral voltage lines directly to the VT terminals, ensuring correct phasing (L1/L2/L3). For current measurement, route each phase conductor through an external 1 A or 5 A CT, connecting secondary leads to the corresponding I+ and I− terminals with proper polarity. Use shielded twisted-pair cable for RS-485 wiring, terminating with 120 Ω resistors at both ends of the bus if multiple devices are connected.

Maintenance recommendations: Verify calibration annually using a portable power quality analyzer, especially in high-accuracy billing applications. Check terminal torque every 12 months to prevent heating due to loose connections. Monitor harmonic trends via SCADA—if THD consistently exceeds 8%, investigate source equipment like VFDs or LED drivers. Keep firmware updated through CCC’s support portal to benefit from bug fixes and new features. Always back up device configuration before performing network changes or panel modifications involving the PSMU-350-3.