DET-SB

Short-circuit detector for ground-level and underground networks

Fault passage detection for ground-level and underground networks, with signaling suited to vaults and cabinets.

  • Ground-level and underground
  • Fault passage detection
  • Remote signaling
Hardware Short-circuit detector for ground-level and underground networks — DET-SB

In ground-level and underground networks, locating the faulted section usually means walking vault by vault until the fault turns up. This detector installs at the cable termination and signals locally — via LEDs — and remotely — via relay and Modbus — both phase-to-phase short circuits and ground faults, narrowing the search to the exact section.

  • Short circuit and ground fault in a single device

    Detects and signals both fault types independently, with no need to install two separate devices.

  • Autonomous for years

    Long-life lithium battery with up to 10 years of autonomy, plus an optional supercapacitor backup.

  • Now with remote Modbus reading

    We added an RS-485 Modbus RTU port to read per-phase currents, fault status and recorded peaks in real time, going beyond the relay contact alone.

  • Built for the outdoors

    IP54 UV-stabilized polycarbonate enclosure, suitable for outdoor installation in vaults and cabinets.

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01Technical specifications

Technical specifications

  • Fault detection

    • Short-circuit (phase-to-phase) and ground-fault detection in a single device
    • Non-directional, threshold-based current detection
    • Adjustable ground-fault trip level from 5 A to 220 A (up to 240 A with long iron band)
    • Configurable short-circuit trip level in 250 A steps, from 250 A to 1000 A
    • Configurable signal duration from 50 ms to 2000 ms depending on fault type
    • 5-second inrush blocking to prevent tripping on energization

  • Indication and reset

    • Independent high-visibility LEDs for short circuit and ground fault
    • Low-battery indication (below 20% capacity)
    • Automatic reset on voltage return (10-230 VAC)
    • Programmable timer reset: 2, 6, 12 or 24 hours
    • Manual reset via front button and remote reset via dry contact

  • Communication and remote signaling

    • Potential-free relay contacts, independent for short circuit and ground fault
    • Contact rating: 2 A, 125 VDC / 250 VAC, 30 W / 62.5 VA
    • RS-485 port with MODBUS RTU protocol
    • Real-time reading of per-phase currents, fault status (short circuit / ground) and recorded peak currents
    • Direct SCADA integration with no additional converters required

  • Power, environment and mechanics

    • Long-life internal lithium battery (up to 10 years), with optional backup supercapacitor
    • Optional external power: 8-48 VDC or 230 VAC
    • Idle consumption below 30 µA
    • Operating ambient temperature: -40°C to +74°C
    • UV-stabilized polycarbonate enclosure, IP54 protection rating
    • Suitable for mounting in vaults and cabinets of underground and ground-level networks

02Main applications

Main applications

  • Fault location in medium-voltage underground networks
  • Ground-level networks in distribution vaults and cabinets
  • Reducing fault-search time during crew patrols
  • SCADA integration for remote fault-passage signaling
  • Networks with isolated, resistance or solidly grounded neutral
  • Branch points and taps on underground networks

Solutions using it

Where it is deployed

03Other products

Other products

Need this unit, or a variant of it?

We adapt inputs, outputs, protocols and operating logic to the requirement. Tell us what you need to solve.

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