Voltage measuring instrument LINETRAXX® PEM353

ACfrequencyreactive power

Product overview
The LINETRAXX® PEM353 is a digital universal measuring device for recording and displaying electrical quantities of supply networks and providing them via a communication interface. It measures voltages, currents, power and energy and evaluates voltage quality (THD and individual harmonics up to the 31st order). Suitable for 2-, 3- and 4‑wire systems and TN, TT and IT topologies. Standard front-panel dimensions: 96 x 96 mm.

Main features / functions

• Comprehensive measured quantities: voltages, currents, power, energy, harmonics, unbalance, angles, THD/TDD, k‑factor, crest factor
• Power Quality Monitoring and limit value monitoring (setpoints) with alarm forwarding
• Energy and power measurement with storage, Time of Use (up to 8 tariffs)
• Configurable start page showing 4 measured quantities
• N conductor measurement and monitoring (PEM353‑N)

Measurement details

• Phase voltages UL1, UL2, UL3 and sum (V)
• Line‑to‑line voltages UL1L2, UL2L3, UL3L1 and sum (V)
• Phase currents I1, I2, I3 and sum (A); neutral current In (calculated) and I4 measured on PEM353‑N
• Residual current Ir (calculated, PEM353‑N)
• Frequency f (Hz)
• Per‑phase and total power: P (kW), Q (kvar), S (kVA)
• Displacement factor cos(φ), power factor λ, phase angles (°)
• Voltage/current unbalance (%)
• Harmonics and distortion: THD/TOHD/TEHD for U and I; individual harmonics to 31st order; TDD for I
• k‑factor and crest factor for currents

Energy meters

• Active energy accuracy class acc. IEC 62053‑22: 0.5 S
• LED pulse output for active or reactive energy
• 2 pulse outputs (PEM353‑P)
• Total and per‑phase energy: import/export, net and total for active/reactive and apparent energy
• Up to 4 additional pulse counters (e.g. gas, water)

Times of Use / Tariffs

• Up to 8 tariffs with tariff switching via digital inputs or schedule (2 schedules)
• Energy metering per tariff and peak demand per tariff

Logs and recording

• Energy meter log — 12 monthly values (total and per tariff)
• Load data: configurable sliding averages, demand forecasts, peak demand log with timestamp
• Max./min. log for 45 quantities with timestamp
• Event log (SOE) — 100 entries with 1 ms resolution
• PEM353‑N: daily (60 days) and monthly (36 months) logs; up to 5 data recorders with up to 16 channels each

Limit value monitoring / Alarms

• 9 parameterisable monitoring points (setpoints)
• Choose from 25 measured quantities for setpoints
• Alerting via display and/or digital outputs; adjustable hysteresis

Operation & usability

• Large backlit graphic display; configurable standard page with 4 values
• Display password protection and operating hours counter
• Connection fault detection (frequency, voltage/current failure, CT polarity, rotating field)

Communication and protocols

• Galvanically isolated RS‑485 interface (1,200–38,400 bit/s)
• LED for communication activity
• Supported protocols: Modbus RTU, BACnet MS/TP, DNP

Applications

• Front‑panel instrument for electrical quantity indication and replacement of analogue indicators
• Power quality monitoring and energy data collection for energy management systems
• Limit value monitoring with alarm forwarding; N conductor monitoring where required

Variants

• PEM353 | 3(N)AC 230/400 V | I1/I2/I3 = 5 A | I4 = - | 2 relay outputs | Art. No. B93100355
• PEM353‑P | 3(N)AC 230/400 V | I1/I2/I3 = 5 A | I4 = - | 2 solid‑state pulse outputs | Art. No. B93100354
• PEM353‑N | 3(N)AC 230/400 V | I1/I2/I3 = 5 A | I4 = 5 A | 2 relay outputs | Art. No. B93100353

Optional accessories (selection)

• Window‑type current transformers (CTB31, CTB41) — various primary currents (60 A … 1000 A), secondary 5 A or 1 A, multiple accuracy classes
• Split‑core current transformers (KBR18, KBR32) — various ratios and accuracies

Technical specifications

• Model name: LINETRAXX® PEM353; dimensions 96 x 96 mm (front panel)
• Supported topologies: 2/3/4‑wire, TN/TT/IT; nominal system voltage 3(N)AC 230/400 V
• Standard current inputs: 5 A (I1–I3); additional I4 = 5 A on PEM353‑N
• Energy accuracy: IEC 62053‑22 class 0.5 S; logging and recorder functions as above
• Interfaces: galvanically isolated RS‑485; Modbus RTU, BACnet MS/TP, DNP