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ABB 1SDA066325R1 Shunt Release Accessory 

1. Key Parameters

• Product Model: 1SDA066325R1
• Product Type: Shunt Release Accessory (electromagnetic actuation for circuit breaker remote opening)
• Core Function: Remotely opens low-voltage circuit breakers via an external DC control signal; supports automated fault response and remote maintenance operations
• Electrical Specifications:
  • Rated Control Voltage (Uc): 24V DC (standard; optimized for low-voltage control circuits)
  • Rated Control Current (Ic): 1.8A (at 24V DC, 25℃)
  • Pick-Up Voltage: ≤75% of Uc (≤18V DC; ensures reliable activation even with minor voltage drops)
  • Drop-Out Voltage: ≥10% of Uc (≥2.4V DC; prevents unintended deactivation)
  • Dielectric Strength: 2kVrms (between control circuit and ground; 1-minute test duration per IEC standards)
  • Insulation Resistance: ≥100MΩ (at 500V DC, 25℃; ensures electrical isolation)
  • Electrical Life: ≥10,000 operation cycles (continuous rated voltage application)
• Mechanical Specifications:
  • Actuation Principle: Electromagnetic solenoid (generates linear force to trip circuit breaker latch)
  • Response Time: ≤50ms (from signal input to breaker opening; critical for fault isolation)
  • Mechanical Life: ≥50,000 operation cycles (combines electrical actuation and manual reset durability)
  • Mounting: Direct attachment to ABB circuit breakers (compatible with Tmax T2-T6, MDmax M2-M6 models); uses factory-provided mounting brackets and fasteners
  • Dimensions (W×H×D): 45mm × 60mm × 35mm (compact profile to fit within switchgear enclosures)
  • Weight: Approximately 150g
  • Material:
    • Housing: Flame-retardant polyamide 6.6 (UL94 V-0; resistant to industrial oils, dust, and mild chemicals)
    • Solenoid Core: Galvanized steel (corrosion resistance, high magnetic permeability)
    • Terminals: Copper alloy (tinned; low contact resistance, anti-oxidation)
• Environmental Ratings:
  • Operating Temperature Range: -25℃~+70℃ (-13℉~158℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: ≤95% RH (non-condensing, 40℃; no moisture-induced electrical faults)
  • Vibration Resistance: 10~500Hz, 2g acceleration (IEC 60068-2-6; no mechanical displacement or solenoid failure)
  • Shock Resistance: 30g acceleration (11ms duration, IEC 60068-2-27; maintains structural integrity post-impact)
• Compliance Standards: IEC 60947-2 (low-voltage circuit breakers), IEC 60947-5-1 (control circuit accessories), UL 508 (industrial control safety), CE (EU safety & EMC directives), RoHS (restriction of hazardous substances)

2. Key Features

• Fast Remote Circuit Isolation: ≤50ms response time enables near-instantaneous opening of circuit breakers when triggered by protective relays (e.g., overcurrent relays) or SCADA systems—minimizing damage to equipment and reducing downtime during electrical faults.
• Low-Voltage DC Compatibility: 24V DC rated control voltage aligns with standard industrial control circuits (common in PLC/DCS systems), eliminating the need for voltage converters and simplifying integration with automation infrastructure.
• Seamless ABB Breaker Integration: Designed exclusively for ABB Tmax/MDmax circuit breakers, with pre-matched mounting points and actuation interfaces—no custom modifications required, reducing installation time and error risk.
• Robust Electromagnetic Design: High-permeability solenoid core ensures consistent actuation force even at voltage fluctuations (down to 75% of Uc), while copper-alloy terminals maintain low contact resistance for reliable signal transmission.
• Flame-Retardant & Chemical-Resistant Housing: UL94 V-0 rated polyamide housing resists ignition, industrial oils, and mild corrosives—suitable for harsh environments like manufacturing plants, oil refineries, and data centers.
• Dual-Life Durability: ≥10,000 electrical cycles and ≥50,000 mechanical cycles ensure long service life, reducing maintenance frequency and replacement costs for 24/7 power distribution systems.
• Safety-Certified Operation: Complies with global low-voltage safety standards (IEC 60947, UL 508) and features reinforced insulation (2kVrms) to prevent electrical shock—protecting personnel during installation and maintenance.

3. Application Fields

• Industrial Power Distribution: Integrated with ABB Tmax circuit breakers in manufacturing facilities (automotive, electronics, food processing) to remotely isolate faulty motor circuits, production lines, or auxiliary equipment—minimizing unplanned downtime.
• Commercial Building Infrastructure: Used in MDmax switchgear for shopping malls, hospitals, and office towers to remotely open breakers for HVAC systems, lighting, or tenant power circuits—enabling scheduled maintenance without on-site manual intervention.
• Data Center Power Systems: Paired with ABB circuit breakers in UPS and server rack power distribution units (PDUs) to rapidly isolate short-circuited racks—protecting critical IT equipment from voltage surges and preventing widespread power loss.
• Renewable Energy Installations: Deployed in solar/wind farm inverter stations to remotely trip breakers connected to faulty inverters or grid links—ensuring safe maintenance and avoiding damage to renewable energy infrastructure.
• Utility Low-Voltage Substations: Integrated into utility switchgear to remotely control residential/commercial feeder circuits—enabling fast fault isolation during power outages and accelerating restoration times.
• Marine & Offshore Power: Used in shipboard switchgear (e.g., cargo vessels, offshore platforms) to remotely open breakers for navigation systems, propulsion auxiliaries, or living quarters—withstanding salt spray and vibration for reliable marine operation.

4. Precautions

• Circuit Breaker Compatibility: Use exclusively with ABB Tmax (T2-T6) and MDmax (M2-M6) circuit breakers. Installation on non-ABB or incompatible breaker models will cause actuation failure or damage to both the accessory and breaker.
• Control Voltage Matching: Ensure the external control circuit provides exactly 24V DC (rated Uc). Overvoltage (>30V DC) 烧毁 the solenoid; undervoltage (<18V DC) prevents reliable actuation.
• Wiring Guidelines: Use copper conductors (0.75mm²~1.5mm²) for control circuit connections. Tighten terminal screws to 0.5~0.7N·m to avoid loose connections (which cause voltage drops or overheating). Keep control wiring separate from high-power cables (≥20cm spacing) to minimize EMI interference.
• Mounting Alignment: Follow ABB’s installation manual to align the shunt release with the breaker’s trip latch. Misalignment increases actuation force, shortens mechanical life, or prevents the breaker from opening fully.
• Environmental Protection: Install in enclosed, climate-controlled switchgear cabinets. Avoid exposure to direct moisture, salt spray (marine environments require IP65-rated enclosures), or temperatures beyond -25℃~+70℃.
• Maintenance Checks: Inspect quarterly:
  • Test remote actuation with a 24V DC signal to verify response time (<100ms) and breaker opening.
  • Check terminals for corrosion or loose connections—clean with a dry cloth and retighten if necessary.
  • Verify insulation resistance (≥50MΩ with a megohmmeter) to ensure no electrical leakage.
• Replacement Criteria: Replace the accessory if:
  • Actuation response time exceeds 100ms.
  • Solenoid emits abnormal noise during activation.
  • Control circuit current exceeds 2.5A (indicates solenoid degradation)
• 

The structure and details of the product：

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