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ABB 1SDA038607R1 Auxiliary Switch  

1. Key Parameters

• Product Model: 1SDA038607R1
• Order Code: 1SDA038607R1
• Product Series: ABB 1SDA Series Auxiliary Switches (for High-Current Circuit Breakers)
• Core Function: Transmits mechanical status signals of main circuit breakers via auxiliary contacts; provides "NO" (Normally Open) and "NC" (Normally Closed) contacts for remote monitoring and interlocking; ensures synchronous operation with main breaker mechanisms
• Electrical Specifications:

  Parameter	Details	Performance Metrics
  Contact Configuration	4 contacts (2NO + 2NC; configurable via terminal blocks)	Independent contact sets for versatile signaling
  Rated Insulation Voltage (Ui)	690V AC	Suitable for medium-voltage auxiliary circuits
  Rated Operational Voltage (Ue)	250V AC (control circuits); 30V DC (electronic circuits)	Compatible with standard industrial control voltages
  Rated Operational Current (Ie)	10A AC (resistive load); 2A AC (inductive load, cosφ=0.4)	Supports high-current auxiliary devices (e.g., signal lamps, relays)
  Making Capacity	100A (peak, AC 250V); 20A (peak, DC 30V)	Withstands inrush current during contact closure
  Breaking Capacity	5A (AC 250V, cosφ=0.7); 0.5A (DC 30V, L/R=40ms)	Reliable breaking of inductive/capacitive loads
  Electrical Life	100,000 operations (at rated load)	Ensures long-term reliability in frequent-operation scenarios

• Mechanical Specifications:
  • Housing Material: Glass-fiber reinforced polyamide (UL94 V-0); high-temperature resistance
  • Dimensions (W×H×D): 65mm × 80mm × 45mm (compact design for breaker accessory compartments)
  • Mounting: Direct mechanical linkage to ABB SACE Tmax T7/T8 and EMAX2 breakers; secured via M4 screws (torque: 1.5 N·m)
  • Weight: Approximately 180g
  • Mechanical Linkage: Synchronized with main breaker toggle; operates within 2ms of breaker position change
  • Mechanical Life: 1,000,000 operations (no-load) | Withstands frequent breaker cycling in industrial applications |
• Environmental Ratings:
  • Operating Temperature Range: -25℃~+70℃ (-13℉~158℉)
  • Storage Temperature Range: -40℃~+85℃ (-40℉~185℉)
  • Humidity Tolerance: ≤95% RH (non-condensing, 40℃; suitable for damp switchgear environments)
  • Vibration Resistance: 10~500Hz, 1.5g acceleration (IEC 60068-2-6; no contact bounce or linkage failure)
  • Shock Resistance: 20g acceleration (11ms duration, IEC 60068-2-27; maintains contact alignment)
• Compliance Standards: IEC 60947-5-1 (low-voltage switchgear), EN 61000-6-2 (EMC immunity), UL 508 (industrial control equipment), CE, RoHS

2. Key Features

• High-Current Breaker Compatibility: Exclusively designed for ABB SACE Tmax T7/T8 (up to 1600A) and EMAX2 (up to 6300A) circuit breakers—mechanical linkage and mounting dimensions perfectly match breaker accessory compartments, ensuring synchronous operation (±2ms) with main contacts.
• Versatile Contact Configuration: 2NO + 2NC contact sets provide flexible signaling options (e.g., "breaker ON" via NO, "breaker OFF" via NC) for SCADA systems, HMI panels, or interlock circuits—eliminates the need for additional auxiliary switches in complex control setups.
• Industrial-Grade Electrical Performance: 10A rated current (resistive) supports direct connection to high-power auxiliary devices (e.g., 250V AC signal lamps, heavy-duty relays) without external contactors—simplifies control circuit design.
• Long Mechanical & Electrical Life: 1,000,000 mechanical operations (no-load) and 100,000 electrical operations (rated load) ensure durability in high-cycle applications (e.g., renewable energy inverter protection, frequent-load industrial circuits).
• Flame-Retardant Housing: UL94 V-0 glass-fiber reinforced polyamide housing resists combustion during internal arcing (e.g., from contact bounce)—enhances safety in switchgear cabinets with multiple electrical components.
• Precise Synchronization: Mechanical linkage operates within 2ms of main breaker position changes, ensuring accurate status signaling for time-sensitive applications (e.g., emergency shutdown interlocks, power transfer systems).

3. Application Fields

• High-Current Circuit Breaker Monitoring: Primary application—status signaling for large breakers:
  • Industrial Power Distribution: Integrates with ABB SACE Tmax T8 (1600A) breakers in factory main distribution boards; 2NO contacts transmit "breaker closed" signals to SCADA, while 2NC contacts trigger local alarm lamps during tripping—enables real-time power distribution monitoring.
  • Renewable Energy Inverters: Connects to EMAX2 (4000A) breakers in solar PV farm AC combiner boxes; NO contacts signal "inverter online" to grid management systems, ensuring efficient power generation monitoring and grid synchronization.
• Control System Interlocking: Enables safety and operational interlocks:
  • Motor Control Centers (MCCs): Provides interlock signals for 1000kW+ motor circuits; NC contacts prevent breaker closure if auxiliary cooling systems fail, protecting motors from overheating—integral to ABB MCC solutions.
  • Generator Switchgear: Links to Tmax T7 (800A) breakers in diesel generator distribution systems; NO contacts allow generator startup only when the main breaker is open, preventing backfeeding to the grid—critical for backup power safety.
• Critical Infrastructure Protection: Supports reliable status monitoring:
  • Data Center UPS Systems: Monitors EMAX2 breakers in UPS output circuits; NC contacts trigger battery backup activation if the main breaker trips, ensuring uninterrupted power to servers—minimizes downtime.
  • Water Treatment Pump Stations: Transmits status of Tmax T8 breakers (controlling 150kW pumps) to PLC systems; NO contacts confirm pump power availability, while NC contacts alert operators to tripped breakers—ensures continuous water supply.

4. Precautions

• Breaker Compatibility: Use exclusively with ABB SACE Tmax T7/T8 and EMAX2 circuit breakers. Never install on non-ABB breakers or incompatible ABB models (e.g., Tmax T5/T6)—mechanical linkage mismatch will cause asynchronous operation, leading to incorrect status signals.
• Electrical Safety:
  • Power Disconnection: Disconnect the main breaker and auxiliary circuits before installing or wiring—live auxiliary contacts (250V AC) pose shock risks, especially when accessing breaker accessory compartments.
  • Contact Loading: Do not exceed 10A resistive/2A inductive load per contact—overloading causes contact welding, resulting in stuck signals (e.g., false "breaker closed" indication). Use external relays for loads exceeding rated current.
• Mechanical Installation:
  • Linkage Alignment: Ensure the auxiliary switch linkage is properly aligned with the main breaker mechanism during installation—misalignment causes delayed operation (>2ms) or contact bounce, leading to erratic signaling. Refer to ABB breaker accessory installation guides.
  • Torque Specification: Tighten mounting screws to exactly 1.5 N·m—under-tightening causes vibration-induced misalignment, while over-tightening cracks the housing, compromising structural integrity.
• Wiring & Contact Handling:
  • Terminal Connections: Use 0.5mm²~2.5mm² (20AWG~14AWG) copper wire for terminal connections; torque terminal screws to 0.8 N·m—loose connections cause voltage drops and intermittent signals, common in vibration-prone environments (e.g., generator rooms).
  • Contact Polarization: Connect "live" circuits to NO contacts and "neutral" to NC contacts to avoid arcing during breaker operation—reverse wiring accelerates contact wear, reducing electrical life by up to 50%.
• Environmental & Maintenance Care:
  • Temperature Limits: Avoid operating above +70℃ or below -25℃—high temperatures degrade contact materials, while low temperatures increase linkage friction, delaying operation beyond the 2ms threshold.
  • Dust & Moisture Protection: Install in IP54-rated switchgear cabinets in dusty/damp environments (e.g., chemical plants, coastal areas)—dust accumulation on contacts causes increased resistance, while moisture leads to corrosion and contact failure.
• Maintenance Checks:
  • Quarterly Inspection: Verify contact operation by manually toggling the breaker; use a multimeter to confirm NO/NC switching—intermittent continuity indicates contact wear or linkage misalignment, requiring cleaning or adjustment.
  • Contact Cleaning: If contacts show signs of oxidation (blackening), clean with fine emery paper (400 grit) and apply a thin layer of contact lubricant (ABB recommended)—oxidized contacts cause high resistance and signal distortion.
  • Replacement Timing: Replace after reaching 100,000 electrical operations or 1,000,000 mechanical operations—exceeding these limits increases the risk of contact failure, leading to incorrect status signals and potential safety hazards

The structure and details of the product：

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