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ABB 1SDA038312R1 Undervoltage Release Device  

1. Key Parameters

• Order Code/Part Number: 1SDA038312R1 (unique identifier for procurement and documentation)
• Core Function: Automatic tripping of circuit breakers when control voltage falls below the rated threshold; maintains breaker closure only when voltage is within safe range
• Rated Control Voltage (Uₙ): 220V DC (standard); Optional 110V DC / 230V AC variants available for compatibility with global control systems
• Voltage Thresholds:
  • Pickup Voltage (Vₚ): 85%~110% of Uₙ (voltage required to engage and hold the release, enabling breaker closure)
  • Dropout Voltage (Vd): 35%~70% of Uₙ (voltage below which the release triggers breaker tripping)
• Power Consumption: ≤15VA (at rated DC voltage; ≤20VA for AC variants)
• Actuation Time: ≤100ms (from voltage drop below Vd to breaker tripping signal output)
• Isolation Level: 2.5kVrms (control circuit to breaker power circuit; terminals to housing)
• Protection Features: Overvoltage protection (up to 120% of Uₙ), 2kV ESD protection (IEC 61000-4-2), short-circuit protection (integrated current-limiting resistor)
• Mounting Method: Panel mounting (via threaded studs) or modular mounting (compatible with ABB Tmax XT series breaker enclosures); no DIN rail adapter required
• Operating Temperature Range: -20℃~+60℃ (-4℉~140℉)
• Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
• Protection Class: IP40 (when installed in a compatible switchgear cabinet); Complies with IEC 60947-1 (low-voltage switchgear safety), IEC 61000-6-2 (EMC immunity)

2. Product Features

• Reliable Undervoltage Protection: Precisely defined pickup (85%~110% Uₙ) and dropout (35%~70% Uₙ) voltages ensure the circuit breaker trips only under unsafe low-voltage conditions—avoiding false tripping from minor voltage fluctuations while preventing equipment damage from sustained undervoltage.
• Fast Actuation: ≤100ms response time enables rapid breaker tripping once voltage drops below the threshold, minimizing exposure of downstream equipment (e.g., motors, pumps) to harmful low-voltage operation.
• Wide Voltage Compatibility: Standard 220V DC rating with optional 110V DC/230V AC variants, supporting integration into diverse global power systems without additional voltage converters.
• Robust Isolation: 2.5kVrms galvanic isolation between the control circuit and breaker power circuit eliminates ground loops and cross-interference, ensuring stable operation in noisy industrial electrical environments.
• Seamless Breaker Integration: Optimized mechanical and electrical design for ABB Tmax XT series circuit breakers—direct mounting and preconfigured electrical connections reduce installation complexity and ensure reliable interlocking with the breaker’s tripping mechanism.
• Intuitive Status Feedback: Built-in LED indicator (green for "voltage normal/ready," red for "undervoltage/tripped") provides real-time visual status, enabling quick troubleshooting of control voltage issues.
• Industrial Durability: Flame-retardant thermoplastic housing (UL94 V-0) and corrosion-resistant metal components (zinc-plated steel) withstand dust, vibration, and humidity—ensuring long service life in industrial plants, substations, and commercial buildings.

3. Application Fields

• Industrial Power Distribution: Protects motors, compressors, and heavy machinery in manufacturing plants, steel mills, and cement facilities—preventing motor stall (and subsequent overheating) caused by low control voltage.
• Commercial Buildings: Integrated with circuit breakers in office towers, shopping malls, and hotels to safeguard HVAC systems, elevators, and lighting networks—avoiding erratic operation of critical building infrastructure during voltage dips.
• Data Centers & Critical Infrastructure: Ensures UPS (Uninterruptible Power Supply) systems and server racks are disconnected from unstable low-voltage grids—preventing data loss or hardware damage from unreliable power.
• Water & Wastewater Treatment: Protects pump motors and valve actuators in treatment plants—avoiding pump cavitation or valve jamming caused by low-voltage-induced torque loss.
• Renewable Energy Facilities: Used in solar farms and wind power plants to trip circuit breakers for inverter systems or auxiliary equipment—preventing damage from voltage fluctuations in off-grid or grid-tied renewable setups.

4. Precautions

• Control Voltage Matching: Strictly match the device’s rated control voltage (e.g., 220V DC) to the system’s control circuit voltage—using an incorrect voltage will damage the UVR coil or render protection ineffective.
• Wiring Safety: Use copper conductors of recommended gauge (minimum 1.5mm² for DC; 2.5mm² for AC) for control wiring; ensure tight terminal connections to avoid voltage drops that could cause false tripping.
• EMI Mitigation: Route control cables separately from high-voltage power cables (minimum 50cm spacing) and use shielded twisted-pair cables—ground the shield at a single point to reduce electromagnetic interference that may disrupt voltage sensing.
• Interlock Verification: When installing with circuit breakers, confirm mechanical interlocks are in place to prevent manual breaker closure while the UVR is in "undervoltage" state—this avoids bypassing safety protection.
• Environmental Limits: Do not operate outside the -20℃~+60℃ temperature range or in humidity exceeding 90% RH (non-condensing); use a climate-controlled switchgear cabinet in harsh environments (e.g., coastal areas with salt spray).
• Regular Testing: Periodically simulate undervoltage conditions (via a test circuit) to verify UVR functionality; inspect electrical connections for corrosion and clean the LED indicator to ensure unobstructed status visibility

The structure and details of the product：

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