Description

Schneider Electric VD23 EMS58421 – Medium‑Voltage Voltage Detection Relay

2. Product Overview

The VD23 EMS58421 is an Easergy series compact voltage detection relay designed for 3‑36 kV medium‑voltage switchgear systems. It monitors phase‑to‑phase and phase‑to‑neutral voltage presence or absence, delivering local LED status indication and relay output signals for fault passage indication and grid supervision. With configurable voltage thresholds and adjustable time‑delay parameters, this unit adapts to diverse MV network conditions. It is panel‑mounted inside RM6, SM6 and other medium‑voltage cubicles, solving the requirement for reliable local voltage status detection for distribution automation and safety interlock logicSchneider ….

3. Technical Specifications

• Brand: Schneider Electric
• Model: VD23 EMS58421
• Warranty: One Year
• Condition: 100% New & Original
• Rated MV Voltage: 3‑36 kV, 50/60 Hz
• Auxiliary Supply: 24‑48 VDC external supply
• Threshold Setting: 40‑90% Un for voltage presence; 10‑30% Un for voltage absence
• Time Delay: Configurable activation & release delay
• Indicators: LED for voltage presence / voltage absence
• Dimensions: 96 (W) × 48 (H) × 100 (D) mm
• Weight: 0.244 kg
• Operating Temp: -40 °C ~ +60 °C
• IP Rating: Front IP40, rear IP30
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4. Application Scenarios

• Medium‑Voltage Distribution Cubicles: Voltage supervision inside RM6 / SM6 switchgear for urban and industrial power distribution networks.
• Grid Fault Passage Indication: Detect loss‑of‑voltage events to support fault‑location logic on overhead and cable MV feeders.
• Industrial Substation MV Panels: Voltage‑based interlock signal generation for safety and automation logic inside factory main substations.