Relé vigilante de tensión
Analogue instruments

Voltage monitoring relay

The voltage monitoring relay is a device designed to monitor and supervise the correct connection of measuring panels in electrical installations, particularly in substations and transformer substations. Its main function is to guarantee system stability by detecting critical problems such as current and voltage unbalance, overvoltage and undervoltage. This equipment is key in installations that require continuous monitoring to prevent damage and ensure the continuity of the electrical service.

The voltage monitoring relay is a device designed to monitor and supervise the correct connection of measuring panels in electrical installations, particularly in substations and transformer substations. Its main function is to guarantee system stability by detecting critical problems such as current and voltage unbalance, overvoltage and undervoltage. This equipment is key in installations that require continuous monitoring to prevent damage and ensure the continuity of the electrical service.

  • RVIA (3-phase 3-wire): Dimensions 150x70x112 mm, weight 1.20 kg.
  • RVIB


    BASIC DATA PROTECTION INFORMATION: Data controller: SOCIEDAD ANÓNIMA DE CONSTRUCCIONES INDUSTRIALES Purpose of processing: To manage the queries made and to send newsletters, commercial communications and promotions. Legitimisation of the processing: Legitimate interest and consent of the data subject. Retention of data: Data will be kept for as long as there is a mutual interest or for the time necessary to comply with legal obligations. Recipients: Service providers or collaborators. Rights: Right to withdraw consent at any time. Right of access, rectification, portability and deletion of your data and the right to limit or oppose its processing. Contact details for exercising your rights: info@saci.es Additional information: You can consult additional information in our Privacy Policy.

    Technical specifications
    Technical specifications

    Technical details

    • Description
    • Technical characteristics
    • Technical data

    SACI's voltage monitoring relays offer a reliable and accurate solution for monitoring three-phase installations in both three-wire (RVIA) and four-wire (RVIB) networks. Thanks to their advanced detection capability, these relays help identify and prevent fault conditions before they affect network operation, which is essential in environments where electrical stability is critical.

    Our watchdog relay models are available in two configurations to suit different needs:

    • RVIA (3-phase 3-wire): Dimensions 150x70x112 mm, weight 1.20 kg.
    • RVIB (Three-phase 4-wire): Dimensions 150x70x112 mm, weight 1.20 kg.

    SACI's voltage monitoring relays are designed to ensure efficient and accurate monitoring in demanding environments:

    • Margin of detection:
      • Imbalance 0 to 20 % of Vn.
      • Undervoltage 80 to 100 % of Vn.
      • Imbalance 0 to 20 % of In.
      •  Overvoltage 120 % of Vn.
    • Class: 1
    • Output characteristics: 250 V, 3 A, 300 VA.
    • Consumption: 0.48 VA per phase

    Related products