The DOLD RN 5883.12 Series Type B Residual Current Monitor (German: Differenzstromwächter Typ B / English: Type B Residual Current Monitor - RCM) is a premier intelligent electrical protection instrument belonging to the prestigious VARIMETER RCM family, researched and manufactured by E. DOLD & SÖHNE GmbH & Co. KG in Germany. In modern industrial automation architectures with high densities of power electronic switching converters—such as variable frequency drives (VFDs), servo positioning controllers, solar photovoltaic (PV) central inverters, DC fast EV chargers, and uninterruptible power supply (UPS) systems—ground fault leakage currents deviate significantly from standard 50Hz sinusoidal AC waves. Ground insulation degradation within these switching stages predominantly induces smooth DC residual currents, pulsating direct currents, and high-frequency AC components reaching frequencies up to 100 kHz.

Conventional Type A and Type AC residual current protective devices are fundamentally blind to smooth DC residual currents; moreover, continuous DC leakage saturates the magnetic cores of Type A sensing transformers, blinding them and rendering them completely incapable of tripping during dangerous secondary ground faults. The DOLD RN 5883.12 series is engineered to eliminate these hazards in strict compliance with international safety standards IEC/EN 62020 and IEC 60947-2 Annex M. Paired with external DOLD Type B measuring current transformers (ND 5016, ND 5017, ND 5019), it provides all-current sensitive (allstromsensitiv) residual surveillance across pure AC, pulsating DC, and smooth DC leakage currents, ensuring non-disruptive, continuous system availability without nuisance plant blackouts.

This comprehensive entry consolidates ten specialized models within the DOLD RN 5883.12 series:
1. Wide-Range General Residual Current Monitoring Models (10 - 3000 mA, Adjustable Time Delay Tv = 0 - 10s):
- RN5883.12/001/61 AC/DC24-80V & ACDC80-230V: Standard configuration featuring an infinitely adjustable response threshold from 10mA up to 3000mA, paired with an adjustable release time delay Tv = 0 - 10s to suppress capacitive charging transients during motor spin-up.
- RN5883.12/004 AC/DC24-80V: Dedicated variant with specialized auxiliary telemetry outputs, powered by an AC/DC 24-80V low-voltage auxiliary supply.
- RN5883.12/010/61 AC/DC24-80V & ACDC80-230V: Features an integrated fault latching memory (Fehlerspeicher) that sustains alarm contact lockout until authorized personnel initiate a manual on-site reset.
- RN5883.12/011/61 AC/DC24-80V & AC/DC80-230V: Advanced variant supporting selectable Auto-Reset and Manual-Reset modes, ensuring optimal continuity for unmanned remote substations.
- RN5883.12/014 AC/DC80-230V: Optimized high-frequency filter circuitry model operating on standard AC/DC 80-230V auxiliary mains.

2. Dedicated Fire Protection (Brandschutz) Models (Standard 300 mA):
- RN5883.12/800/61 AC/DC80-230V Tv=0s: Purpose-built to meet VdS fire prevention guidelines and DIN VDE 0100-482 for high-risk combustible environments (sawmills, paper storage, textile manufacturing). Features a fixed 300mA trip limit with instantaneous disconnection (Tv = 0s) and an integrated 50% AC prewarning threshold (Vorwarnung at 150mA) to eliminate thermal arc ignition risks.
- RN5883.12/802/61 AC/DC80-230V Tv=0S: Enhanced fire safety variant featuring specialized frequency conditioning and independent prewarning signaling paths with instantaneous response (Tv = 0s).

The unit features the ".12" contact architecture comprising 2 independent changeover contacts (2 C/O) with high switching capacity, allowing segregated prewarning and main isolation trip circuits. Packaged in a compact 52.5 mm wide RN enclosure for 35mm DIN-rails, it features a front multi-LED bar-graph displaying live residual current percentages alongside integrated Test and Reset buttons. The DOLD RN 5883.12 is an essential predictive asset for datacenters, solar farms, EV charging infrastructures, and Industry 4.0 smart automated facilities worldwide.

• Manufacturer: DOLD (E. DOLD & SÖHNE GmbH & Co. KG)
• Country of Origin: Germany
• Product Series: VARIMETER RCM - RN 5883
• Contact Code: .12 (2 Changeover contacts - 2 C/O contacts)
• Measuring Classification: Type B Residual Current Monitor (All-current sensitive: AC, pulsating DC, smooth DC up to 100 kHz)
• Covered Product Part Numbers:
  - RN5883.12/001/61 AC/DC24-80V 0-10S (Measuring range: 10-3000mA)
  - RN5883.12/001/61 ACDC80-230V 0-10S (Measuring range: 10-3000mA)
  - RN5883.12/004 AC/DC24-80V 0-10S (Measuring range: 10-3000mA)
  - RN5883.12/010/61 AC/DC24-80V 0-10S (Measuring range: 10-3000mA, latching memory)
  - RN5883.12/010/61 ACDC80-230V 0-10S (Measuring range: 10-3000mA, latching memory)
  - RN5883.12/011/61 AC/DC24-80V 0-10S (Measuring range: 10-3000mA, selectable Auto/Manual Reset)
  - RN5883.12/011/61 AC/DC80-230V 0-10S (Measuring range: 10-3000mA, selectable Auto/Manual Reset)
  - RN5883.12/014 AC/DC80-230V 0-10S (Measuring range: 10-3000mA)
  - RN5883.12/800/61 AC/DC80-230V Tv=0s (Fire protection: fixed 300mA, prewarning at 50% = 150mA)
  - RN5883.12/802/61 AC/DC80-230V Tv=0S (Fire protection: fixed 300mA, prewarning at 50% = 150mA)
• Measuring Residual Current Ranges:
  - Standard models: 10 ... 3000 mA (0.01 A to 3 A adjustable via rotary potentiometer)
  - Fire protection models (/800 & /802): Fixed 300 mA (Prewarning trigger at 50% = 150 mA)
• Auxiliary Operating Supply Voltage (UH):
  - Low-voltage range: AC/DC 24 ... 80 V
  - High-voltage range: AC/DC 80 ... 230 V
• Auxiliary Supply Frequency: 50 / 60 Hz or DC
• External Current Transformer Interface: Operates with DOLD Type B measuring current transformers ND 5016, ND 5017, ND 5019
• Response Time Delay (Tv):
  - Standard models: Infinitely adjustable from 0 to 10 seconds (Tv = 0 ... 10s)
  - Fire protection models (/800, /802): Instantaneous (Tv = 0s)
• Output Contact Arrangement: 2 Changeover contacts (2 C/O - 2 x 1 Wechsler)
• Contact Breaking Capacity: AC-15: 3A / AC 230V; DC-13: 2A / DC 24V (according to IEC/EN 60947-5-1)
• Visual Diagnostics & Controls: Front multi-LED residual current bar graph, error LEDs, Test and Reset pushbuttons
• Enclosure Dimensions (W x H x D): 52.5 x 90 x 71 mm (Standard RN housing)
• Mounting Profile: Quick snap-on mounting on standard 35 mm DIN-rail (IEC/EN 60715)
• Wiring Terminals: Vibration-proof box clamp screw terminals
• Protection Rating: Housing IP40, Terminals IP20 (according to IEC/EN 60529)
• Ambient Operating Temperature: -20°C to +60°C
• Compliant Safety Standards: IEC/EN 62020, IEC 60947-2 Annex M, DIN VDE 0100-482, VdS 2033, CE
• Common Industrial Deployments: Variable speed drives, EV charging infrastructure, solar PV systems, BESS battery rooms, chemical plants, and woodworking factories