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ABB DSSB146 DC/DC Converter  

1. Key Parameters

• Product Model: DSSB146
• Product Series: ABB AC500 Series Industrial High-Power Isolated DC/DC Converters (High-Capacity Voltage Conversion)
• Core Function: Converts 24V/48V DC input to 12V/24V/48V DC regulated output (configurable); provides 2.5kV AC galvanic isolation between input and output; suppresses EMI/EMC interference; offers multi-layer protection (overvoltage/overcurrent/short-circuit/overtemperature); powers high-load AC500 systems (multi-module racks, distributed I/O); supports DIN rail mounting for industrial cabinet integration
• Electrical Conversion Specifications:

  Parameter	Details	Performance Metrics
  Input Characteristics	- Input Voltage Range: Dual-range (24V DC ±25%: 18V~30V; 48V DC ±25%: 36V~60V) - Input Current: Max 10A (24V input); Max 5A (48V input) - Input Protection: Reverse polarity (fuse-protected); surge protection (IEC 61000-4-5, 2kV); brownout tolerance (18V/36V min, 5s hold-up)	Wide input range adapts to unstable industrial DC mains (e.g., voltage drops from heavy loads); 2kV surge protection withstands lightning-induced spikes or VFD switching transients; reverse polarity fuses prevent irreversible damage from wiring errors
  Output Characteristics	- Output Voltage Options: 3-way configurable (12V DC ±2%, 24V DC ±2%, 48V DC ±2%) via DIP switch - Output Power: 120W (max continuous, 25℃) - Output Current: 10A (12V output); 5A (24V output); 2.5A (48V output) - Voltage Regulation: ±0.3% (line regulation); ±0.8% (load regulation) - Ripple & Noise: ≤20mVpp (20MHz bandwidth)	3-way output adapts to diverse loads (12V legacy sensors, 24V AC500 modules, 48V high-power actuators); ≤20mVpp ripple ensures stable operation of precision components (e.g., AC500 DSPB112 signal boards, 48V valve actuators); 120W power covers multi-module PLC racks (1× DSPC172 + 10× DSMB I/O modules)
  Isolation & EMI Performance	- Galvanic Isolation: 2.5kV AC (input to output, 1 minute) - Insulation Resistance: ≥200MΩ (500V DC, input-output) - EMC Compliance: EN 61000-6-2 (immunity: Level 4); EN 61000-6-3 (emission: Class B) - Noise Suppression: Dual-stage LC filter (conducted noise) + shielded toroidal transformer (radiated noise)	2.5kV AC isolation blocks ground loops in large automation networks (e.g., 48V plant mains vs. 24V PLC circuits); Level 4 EMC immunity withstands extreme noise from welding machines/VFDs; Class B emission avoids interfering with AC500 PROFINET/Modbus communication

• Mechanical & Environmental Specifications:

  Parameter	Details	Performance Metrics
  Mechanical Design	- Dimensions: 120mm (W) × 80mm (H) × 150mm (D) - Mounting Type: DIN rail mount (EN 50022, 35mm) + optional panel mount brackets - Housing Material: Aluminum alloy (heat dissipation) + flame-retardant ABS (UL 94 V0) - Weight: Approximately 650g - Indicators: 3× LED status lights (green = output normal; amber = overload; red = fault)	Aluminum housing enhances passive heat dissipation (handles 120W without fans); 3-color LEDs enable precise fault diagnosis (overload vs. critical fault); DIN rail design fits standard industrial cabinets (no custom enclosures needed)
  Environmental Ratings	- Operating Temperature Range: -30℃~+75℃ (-22℉~167℉) - Storage Temperature Range: -40℃~+85℃ (-40℉~185℉) - Humidity Tolerance: 5%~95% RH (non-condensing, 45℃) - Vibration Resistance: 10~500Hz, 1.5g acceleration (IEC 60068-2-6) - Shock Resistance: 30g (11ms half-sine, IEC 60068-2-27)	-30℃~+75℃ range suits extreme environments (arctic substations, desert solar farms); 1.5g vibration resistance withstands pump/turbine-induced shocks; humidity tolerance avoids performance issues in damp utility cabinets

• Protection & Compliance Specifications:

  Parameter	Details	Performance Metrics
  Protection Features	- Overvoltage Protection: 14.4V (12V output), 28.8V (24V output), 57.6V (48V output) (latching reset) - Overcurrent Protection: 12A (12V), 6A (24V), 3A (48V) (hiccup mode, auto-recovery) - Short-Circuit Protection: Current limiting (≤15A/7.5A/3.75A) (hiccup mode) - Over-Temperature Protection: 90℃ ±5℃ (thermal shutdown, auto-recovery when cooled to 70℃)	Latching overvoltage protection prevents damage to sensitive 12V/24V loads (e.g., legacy sensors); hiccup-mode short-circuit protection avoids converter burnout while allowing temporary faults (e.g., shorted actuator wiring) to clear; 90℃ shutdown protects against extreme cabinet heat
  Compliance Standards: CE, UL 508, CSA C22.2 No.14, IEC 61558-2-1 (power converters), IEC 60950-1 (safety), RoHS 2.0, ISO 9001

2. Core Features

• High Power Density & Flexible Voltage Configuration: 120W output in a compact DIN rail form + 3-way configurable output (12V/24V/48V)—powers large AC500 systems (e.g., 1× DSPC172 processor + 10× DSMB I/O modules) or high-current loads (48V 2.5A valve actuators); eliminates the need for multiple low-power converters, reducing cabinet space by 60% and inventory complexity.
• 2.5kV AC Galvanic Isolation: Industry-leading input-output isolation—blocks ground loops in large automation networks (e.g., 48V plant-wide DC mains vs. 24V PLC circuits), eliminating analog signal drift (e.g., pH/temperature sensor errors) and digital communication drops (PROFINET/Modbus); 200MΩ insulation resistance ensures long-term isolation reliability.
• Ultra-High Efficiency & Low Ripple: 94% peak conversion efficiency (50%~75% load) + ≤20mVpp output ripple—minimizes energy waste (low heat generation) for 24/7 operation (e.g., $80~$120/year in energy savings per unit); low ripple ensures precision performance of AC500 DSPB signal modules and high-sensitivity sensors (e.g., 12V laser profilometers).
• Extreme EMC Immunity & Suppression: Dual-stage LC filter + shielded toroidal transformer—complies with EN 61000-6-2 Level 4 immunity (withstands harsh industrial noise) and EN 61000-6-3 Class B emission (avoids interfering with PLC communication); ideal for installation near high-noise equipment (VFDs, welding machines, high-voltage switchgear).
• Industrial-Grade Thermal Management: Aluminum alloy housing + passive heat dissipation—no internal fans (eliminates 30% of typical converter failure points); handles 120W continuous output at 75℃ without overheating; 90℃ thermal shutdown prevents damage in hot cabinets (e.g., near industrial ovens or substation transformers).
• Comprehensive Fault Resilience: Multi-layer protection (overvoltage/overcurrent/short-circuit/overtemperature)—covers all common industrial faults (input voltage spikes, shorted loads, extreme temperatures); latching overvoltage protection requires manual reset to avoid repeated load damage, while hiccup-mode overcurrent protection auto-recovers from temporary issues (e.g., momentary actuator overloads).
• Seamless AC500 Integration: Plug-and-play DIN rail mounting + standard terminal blocks—installs in <10 minutes (no programming/calibration); compatible with all AC500 series PLCs, DSRF I/O frames, and ABB power supplies (DSSA165/DSSA200); terminal blocks accept 10AWG (5.3mm²) cables for high-current connections.

3. Application Fields

• Manufacturing Automation: High-Load PLC Power:
  • Automotive Mega-Plants: Converts 48V DC factory mains to 24V DC for AC500 multi-module racks (1× DSPC172 + 10× DSMB I/O modules)—120W output powers the entire rack; 2.5kV isolation prevents ground loops between welding zones and PLC circuits; low ripple ensures robotic position encoder accuracy (±0.02mm).
  • Electronics Semiconductor Fabs: Adapts 24V DC cleanroom power to 12V DC for legacy wafer inspection sensors and 48V DC for high-power vacuum pumps—3-way output eliminates separate converters; EMC suppression avoids interfering with sensitive fab equipment (e.g., wafer steppers); aluminum housing resists cleanroom chemicals (isopropyl alcohol).
• Process Control: Hazardous Area High-Power Backup:
  • Chemical Complexes: Converts 48V DC DCS power to 24V DC for AC500 reactor control racks (1× DSPC157 + 8× DSMX safety modules)—2.5kV isolation prevents ground loops with process sensors (e.g., corrosive chemical level transmitters); over-temperature protection withstands heat from reactor proximity; 120W output powers emergency shutdown valves.
  • Oil Refineries: Converts 24V DC substation power to 48V DC for pipeline pump controllers—-30℃~+75℃ range suits outdoor substation cabinets; vibration resistance (1.5g) withstands pump-induced shocks; short-circuit protection avoids damage from rodent-chewed wiring in remote pump stations.
• Energy & Utilities: Substation/Renewable Power:
  • EHV Substations (500kV+): Converts 48V DC battery power to 24V DC for AC500 auxiliary control systems (switchgear, cooling fans)—2.5kV isolation blocks ground loops between substation battery banks and PLCs; Level 4 EMC immunity resists noise from high-voltage switchgear; 90℃ thermal shutdown protects against summer cabinet heat.
  • Solar PV Plants (1GW+): Adapts 48V DC inverter power to 24V DC for AC500 DSRF182 I/O frames (8× DSRF180A remote I/O modules)—120W output powers the entire frame; wide input range (36V~60V) handles variable inverter output during cloudy conditions; passive cooling avoids fan clogging from desert dust.
• Infrastructure: Heavy-Duty Automation:
  • Metro Rail Systems: Converts 48V DC rail power to 24V DC for AC500 station automation racks (HVAC, lighting, security)—120W output powers 5× DSMB I/O modules + 2× DSPB communication boards; 1.5g vibration resistance withstands train-induced shocks; EMC suppression avoids interference with rail signaling systems.
  • Mining Operations: Converts 24V DC mine power to 48V DC for underground crusher control systems—-30℃ operating range suits cold mine shafts; aluminum housing resists coal dust and moisture; short-circuit protection avoids damage from water ingress in damp mines.

The structure and details of the product：

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