The Circutor EC72 F III+N 500V (code M10728) is a panel-mount analog voltmeter with an integrated phase selector switch for AC voltage measurement on three-phase 4-wire systems. It measures phase-to-neutral voltages up to 500 V at Class 1.5 accuracy and fits a standard 72 x 72 mm panel cutout.

Technical specifications:

• Model: EC72 F III+N 500V
• Circutor code: M10728
• EAN: 8433059005245
• System: Three-phase 4 wire
• Measurement range: 500 V
• Accuracy class: 1.5 (1.5% FE)
• Scale: 90, pointer position P1
• Panel module size: 72 x 72 mm
• Overall dimensions (W x H x D): 72 x 72 x 49.2 mm
• Weight: 0.166 kg
• Mounting: Panel (flush)
• Front protection: IP 52
• Terminal protection: IP 00
• Working temperature: +10 to +30 C
• Storage temperature: -25 to +40 C
• Frequency range: 20 to 100 Hz
• Measurement circuit consumption: 1 to 4 VA
• Maximum continuous voltage: 1.5 x Vn continuous; 2 x Vn for 5 seconds
• Insulation voltage: 2 kV at 50 Hz for 1 minute (between mechanism and case)
• Maximum installation altitude: 2000 m
• Standards: BS 89, UNE-EN 60051, IEC 144, DIN 43780, IEC 51, UNE 21318
• Certifications: CE

Features and benefits:

• Integrated phase selector switch lets a single instrument display each phase-to-neutral voltage in a three-phase 4-wire network, removing the need for three separate meters.
• IP 52 front protection resists dust ingress and light water splashes, making it suitable for industrial control panel environments.
• Class 1.5 accuracy with compliance to IEC 51, UNE-EN 60051, and DIN 43780 ensures reliable, standards-verified voltage readings.
• Frequency operating range of 20 to 100 Hz accommodates both fixed-frequency mains supplies and variable-frequency drive output circuits.
• Standard 72 x 72 mm flush-mount format drops directly into conventional switchboard and control panel cutouts without adapters.

Applications:

• Phase voltage monitoring in industrial switchboards and motor control centres on three-phase 4-wire low-voltage networks.
• Power distribution panels in commercial and industrial buildings where individual phase voltages must be verified at a single instrument.
• Electrical test benches and laboratory panels requiring a CE-certified, panel-mount AC voltmeter meeting international standards.
• Control cabinets serving machinery powered by variable-frequency drives operating across a broad 20 to 100 Hz frequency range.

Also known as: Circutor EC72 F III+N 500V, EC72 F III+N 500V M10728, Circutor M10728, three-phase panel voltmeter with phase switch, 500 V analog voltmeter.