The DOLD RK8832 and variant RK8832/100 electronic acoustic alarm buzzer series (German: Alarmgeber / English: Acoustic Signaling Device / Buzzer) is an engineered audible signaling unit researched and manufactured by E. DOLD & SÖHNE GmbH & Co. KG in Germany. In complex industrial installations and plant operations, acoustic notification is an indispensable safeguard, instantly conveying severe abnormal states—such as circuit breaker trips, phase failures, excessive thermal dissipation, or emergency stoppages—to field personnel even when control cabinets are out of direct sightline.

The defining characteristic distinguishing the RK8832 series from traditional industrial buzzers is its specialized RK-enclosure profile. Geometrically engineered to comply with the DIN 43880 standard for modular installation equipment in low-voltage distribution boards (consumer units / sub-distribution panels), it features an ultra-compact width of 17.5 mm (1 module width / 1 HP) and a standard 45 mm front cutout. This form factor allows the DOLD RK8832 to mount flush alongside standard MCBs, RCCBs, and modular contactors behind distribution panel escutcheon plates without requiring mechanical modifications or manual cutouts.

Internally, the device incorporates a high-efficiency piezoelectric transducer coupled with a solid-state electronic oscillator circuit exhibiting minimal internal heat generation. It generates a clear, authoritative acoustic tone with a sound pressure level reaching approximately 60 – 75 dB(A) at a distance of 1 meter. The acoustic spectrum is centered in the mid-high frequency band (~2.4 – 3.5 kHz), optimized for acoustic penetration through ambient machinery hum without creating high-pitched auditory strain.

The series is tailored into two distinct functional configurations:
- Standard DOLD RK8832: Emits an instant continuous or pulsing tone immediately upon supply voltage energization across its main terminals.
- Enhanced DOLD RK8832/100: Incorporates auxiliary control inputs, enabling tiered acoustic signaling to differentiate between warning notices and urgent alarms, while supporting an external push-button input for alarm acknowledgment and temporary audio muting (mute function) while maintaining visual annunciator status.

The series provides broad operational compatibility with two primary industrial power supplies: AC/DC 24V (ideal for SELV/PELV safety circuits, PLCs, and 24V control buses) and direct mains AC 230V 50/60Hz. Encased in self-extinguishing industrial thermoplastic designed for 35mm DIN-rail snapping, and rated for continuous 100% ED duty without thermal fatigue, the DOLD RK8832 is an essential acoustic warning asset for modular sub-distribution switchboards, electrical substations, HVAC chillers, pumping stations, and automated industrial plants worldwide.

• Manufacturer: DOLD (E. DOLD & SÖHNE GmbH & Co. KG)
• Country of Origin: Germany
• Product Category: Electronic Acoustic Signaling Device / Buzzer (Alarmgeber)
• Product Series: RK8832
• Covered Product Part Numbers:
  - DOLD RK8832 AC/DC 24V (Standard model, 24V supply)
  - DOLD RK8832 AC 230V 50/60Hz (Standard model, 230V mains)
  - DOLD RK8832/100 AC/DC 24V (Extended function / muting model, 24V supply)
  - DOLD RK8832/100 AC 230V 50/60Hz (Extended function / muting model, 230V mains)
• Nominal Voltage Ratings:
  - AC/DC 24V: Tolerance range 0.85 ... 1.15 UN
  - AC 230V: Frequency 50 / 60 Hz, tolerance range 0.85 ... 1.15 UN
• Power Consumption: Ultra-low, approx. 0.5 VA - 1.5 VA
• Acoustic Sound Pressure Level: Approx. 60 - 75 dB(A) at 1 meter distance
• Acoustic Frequency Spectrum: ~2.4 kHz – 3.5 kHz optimized for high ambient noise environments
• Tone Pattern: Continuous tone (Dauerton) or pulsing/intermittent tone (Intervallton) based on connection
• Duty Cycle: 100% ED (Continuous operation without thermal degradation)
• Enclosure Specification: Standard RK housing conforming to DIN 43880 for consumer units / distribution boards
• Enclosure Dimensions (W x H x D): 17.5 x 89 x 58 mm (1 module width / 1 TE)
• Mounting Profile: Snap-on mounting for standard 35 mm DIN-rail (IEC/EN 60715)
• Terminal Architecture: Vibration-proof box clamp screw terminals accepting solid or stranded ferruled wires
• Protection Degree: Enclosure IP40, Terminals IP20 (according to IEC/EN 60529)
• Ambient Operating Temperature: -20°C to +60°C
• Compliant Standards: DIN 43880, IEC/EN 60947-1, IEC/EN 61000-6-2, IEC/EN 61000-6-4, CE
• Typical Applications: Low-voltage distribution boards, modular consumer panels, PLC enclosures, HVAC chillers, pumping stations, ATS panels