The Westermo MD-52-DC is an RS-232 isolator that delivers galvanic isolation and surge protection for serial communication links in industrial environments. It safeguards connected devices from voltage spikes, ground loops, and electrical noise while maintaining transparent, plug-and-play operation. The unit combines optocoupler-based data isolation with transformer-isolated power delivery, achieving 1500 V rms isolation voltage and 440 V breakthrough protection. Rated for asynchronous data transmission at 115,200 kbit/s, the MD-52-DC supports dual RS-232 interfaces (DCE female and DTE male) plus two detachable screw terminals. Its compact DIN-rail form factor, integral mounting clip, and wide operating temperature range (–25°C to 70°C) suit harsh industrial deployments. The device has passed EMC, vibration, and shock testing to industrial standards, with UK Network Rail and EU conformity documentation available.
Technical Specifications
• Isolation: Full galvanic isolation via optocouplers (data) and transformer (power); 1500 V rms isolation voltage
• Data Rate: Up to 115,200 kbit/s asynchronous
• Surge Protection: Breakthrough voltage 440 V at 230 V AC / 220 V at 115 V AC
• Input Voltage: 12–36 V DC
• Power Consumption: Max 1 W (MD-52-DC model)
• Operating Temperature: –25°C to 70°C
• Humidity: 0–95% RH, non-condensing
• Physical: 55 × 100 × 128 mm; 0.4 kg; DIN-rail mountable
– Key Features
• Transparent communication—no protocol modification required
• Plug-and-play installation with no configuration steps
• Dual RS-232 interfaces: 9-pin D-sub (female/male) and screw terminal blocks
• Industrial EMC, shock, and vibration certifications
• Compact design with integral DIN-rail clip for space-constrained installations
– Typical Applications
• Serial communication protection in railways and transit systems
• Ground loop elimination in multi-device industrial networks
• Voltage spike suppression for sensitive automation equipment
• Noise immunity in electrically harsh factory environments
– Compatibility & Integration
The MD-52-DC complies with EIA RS-232-C, CCITT V.24, and V.28 serial standards. It accepts 9-pin and 5-pin terminal block configurations. Note: This product is no longer manufactured and may have limited support and parts availability.
