The DOLD EH 5861 Series Analog Indicating Instrument (German: Anzeigeinstrument / English: Panel Indicating Meter) is a specialized electrical measurement instrument engineered and manufactured by E. DOLD & SÖHNE GmbH & Co. KG in Germany. In ungrounded IT electrical power distributions—where continuous operational reliability is strictly non-negotiable, such as in hospital operating theatres, offshore oil platforms, naval marine vessels, large-scale utility solar photovoltaic fields, and chemical processing complexes—continuous surveillance of insulation resistance between active phase conductors and earth ground is essential to avert catastrophic second-fault ground short circuits and electrical plant fires.

The DOLD EH 5861 indicating unit is specifically designed to interface externally with the analog telemetry output ports of DOLD Insulation Monitors mounted internally on DIN rails. Functioning as a high-visibility human-machine interface on the switchboard exterior, it enables plant engineers and safety technicians to continuously track the live insulation degradation status (calibrated in kΩ or MΩ) of the power network without having to open the enclosure doors. This eliminates the operational risks associated with opening high-voltage switchgear doors during live runtime.

Boasting a standardized DIN 96 x 96 mm bezel format, the EH 5861 features an expansive angular deflection scale with non-linear logarithmic markings. This geometry offers superior resolution across low insulation resistance domains (critical for preemptive fault warning) while accommodating broad high-resistance spans (denoting optimal network health). Its core incorporates a high-sensitivity moving-coil movement equipped with magnetic damping, providing smooth pointer deflection, high vibration immunity, and instantaneous dynamic response to fluctuations in grid ground leakage.

The EH 5861 series is standardized into three distinct variants, each tailored to specific DOLD insulation monitor families:
- DOLD EH 5861/002 (Part Number: 0030616): Optimized for legacy and classic DOLD insulation monitors including AG 5870, AI 5873, delivering reliable field replacements and retrofits.
- DOLD EH 5861/004 (Part Number: 0030618): Calibrated specifically for industrial process insulation monitors including UH 5892 and AN 5873 in industrial drive and control grids.
- DOLD EH 5861/005 (Part Number: 0067516): Advanced generation variant with impedance and scale matching designed for the cutting-edge VARIMETER IMD LK 5896 intelligent insulation monitor series deployed in high-capacitance photovoltaic and inverter networks.

The front bezel is sealed with scratch-resistant optical glass and achieves an IP52 enclosure protection rating when installed with standard sealing gaskets. Supplied with robust rear clamp brackets, it ensures rapid, secure, and vibration-proof panel cutout installation in heavy-duty industrial operating environments.

• Manufacturer: DOLD (E. DOLD & SÖHNE GmbH & Co. KG)
• Country of Origin: Germany
• Product Category: Analog Panel Indicating Instrument (Anzeigeinstrument)
• Product Series: EH 5861
• Covered Models in this entry:
  - DOLD EH5861/002 (Part Number: 0030616) - Paired with AG 5870, AI 5873
  - DOLD EH5861/004 (Part Number: 0030618) - Paired with UH 5892, AN 5873
  - DOLD EH5861/005 (Part Number: 0067516) - Paired with LK 5896 (VARIMETER IMD)
• Primary Function: Continuous visual indication of actual insulation resistance to ground in ungrounded IT systems
• Movement Type: High-precision moving-coil movement with magnetic damping
• Scale Display: Non-linear logarithmic scale (kΩ / MΩ) with intuitive multi-color warning zones
• Input Signal: Receives analog current/voltage signal from DOLD insulation monitor output
• Dimensions (Width x Height x Depth): 96 x 96 x 52 mm (Standard DIN 43700 / DIN EN 60051)
• Panel Cutout Dimensions: 92 x 92 mm (+0.8 mm)
• Pointer Deflection Angle: Approx. 90°
• Accuracy Class: Class 1.5 according to standard analog measuring instruments
• Mounting Type: Flush panel door mounting with heavy-duty screw clamp brackets
• Wiring Termination: Screw clamp terminals on the rear housing
• Protection Degree: Front side IP52 (with sealing gasket), rear terminal blocks IP00 / IP20
• Operating Ambient Temperature: -20°C to +60°C
• Compliant Standards: DIN EN 60051, IEC/EN 61557-8, DIN 43700, CE
• Typical Applications: Medical isolated power panels, marine vessels, PV solar farms, mining substations, IT distribution switchboards