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ABB DSSR122 DC Input Power Supply Unit 

1. Key Parameters

• Product Model: DSSR122
• Product Series: ABB AC500 Series Industrial DC-Input Power Supply Units (DC-to-DC Conversion)
• Core Function: Converts 24V/48V DC input (unregulated) to regulated 24V DC (or 12V DC optional) for AC500 PLCs and automation components; provides 2kV AC galvanic isolation between input and output; delivers low-ripple output for sensitive sensors; includes comprehensive protection (overload/overvoltage/short-circuit/over-temperature); supports DIN rail mounting for industrial cabinets
• Electrical Specifications:

  Parameter	Details	Performance Metrics
  Input Characteristics	- Input Voltage Range: Dual-range DC (24V DC ±30%: 16.8V~31.2V; 48V DC ±30%: 33.6V~62.4V) - Input Current: Max 8.3A (24V input); Max 4.2A (48V input) - Input Protection: Reverse polarity (diode + fuse protected); Surge protection (IEC 61000-4-5, 2kV); Brownout tolerance (16.8V/33.6V min, 8s hold-up)	Wide DC input range adapts to fluctuating sources (e.g., battery discharge, solar panel output); 2kV surge protection withstands transients from DC mains or load switching; reverse polarity protection avoids damage from incorrect wiring
  Output Characteristics	- Output Voltage: 24V DC ±2% (regulated; optional 12V DC ±2% variant) - Output Current: Max 4.2A (24V DC model); Max 8.4A (12V DC model) - Output Power: 100W (24V DC × 4.2A; 12V DC × 8.4A) - Voltage Regulation: ±0.6% (line regulation); ±1.0% (load regulation) - Ripple & Noise: ≤50mVpp (20MHz bandwidth)	100W output powers medium AC500 systems (1× DSPC155 + 6× DSMB I/O modules + 8× sensors); ≤50mVpp ripple ensures stable operation of analog devices (e.g., 4-20mA pressure transmitters); tight regulation avoids PLC logic errors from input fluctuations
  Isolation Performance	- Galvanic Isolation: 2kV AC (input to output, 1 minute) - Insulation Resistance: ≥200MΩ (500V DC, input-output) - EMC Compliance: EN 61000-6-2 (immunity: Level 3); EN 61000-6-3 (emission: Class B)	2kV isolation blocks ground loops between primary DC sources (e.g., battery banks) and secondary PLC circuits; reduces noise coupling, critical for analog signal integrity in remote monitoring systems

• Mechanical & Environmental Specifications:

  Parameter	Details	Performance Metrics
  Mechanical Design	- Dimensions: 90mm (W) × 110mm (H) × 135mm (D) - Mounting Type: DIN rail mount (EN 50022, 35mm, tool-less snap-on) - Housing Material: Flame-retardant aluminum alloy (heat dissipation) + UL 94 V0 plastic - Weight: Approximately 600g - Indicators: 1× DC input LED (green = active); 1× DC output LED (green = normal, red = fault); 1× isolation status LED (blue = isolation intact)	Aluminum housing enhances heat dissipation for 100W DC-to-DC conversion; 3-color LEDs enable quick diagnosis (e.g., blue = isolation normal, red = output fault); tool-less mounting simplifies installation in DC cabinet layouts
  Environmental Ratings	- Operating Temperature Range: -30℃~+70℃ (-22℉~158℉) - Storage Temperature Range: -40℃~+85℃ (-40℉~185℉) - Humidity Tolerance: 5%~95% RH (non-condensing/condensing, up to 50℃) - Vibration Resistance: 10~500Hz, 1g acceleration (IEC 60068-2-6) - Shock Resistance: 20g (11ms half-sine, IEC 60068-2-27)	-30℃~+70℃ range suits extreme DC-powered environments (arctic telecom towers, desert solar installations); condensing humidity tolerance eliminates dehumidifiers in damp battery rooms; 1g vibration resistance withstands vehicle/equipment-induced motion

• Protection & Compliance Specifications:

  Parameter	Details	Performance Metrics
  Protection Features	- Overload Protection: 110%~150% load (hiccup mode, auto-recovery) - Overvoltage Protection: 29V DC ±5% (24V model); 15V DC ±5% (12V model) (latching, manual reset) - Short-Circuit Protection: Current limiting (≤5A for 24V; ≤10A for 12V) (hiccup mode) - Over-Temperature Protection: 80℃ ±5℃ (thermal shutdown, auto-recovery at 65℃) - Isolation Monitoring: Continuously checks insulation resistance (alerts via LED if <100MΩ)	Multi-layer protection covers DC-specific faults (e.g., battery overcharge, shorted sensor wiring); isolation monitoring prevents unsafe operation if insulation degrades; latching overvoltage protection avoids damage to sensitive PLC modules
  Compliance Standards: CE, UL 508, CSA C22.2 No.14, IEC 61558-2-1 (power supplies), IEC 61000-6-2 (EMC), RoHS 2.0, ISO 9001

2. Core Features

• DC-to-DC Precision Conversion: Converts unregulated 24V/48V DC input to stable 24V/12V DC output—ideal for DC-powered environments (e.g., battery-backed industrial systems, solar PV microgrids) where AC mains are unavailable; wide input range (±30%) tolerates voltage fluctuations from battery discharge or solar irradiance changes.
• 2kV Galvanic Isolation: Input-output isolation blocks ground loops between primary DC sources (e.g., 48V battery banks) and secondary PLC circuits—critical for remote sites with distributed ground potentials; 200MΩ insulation resistance ensures long-term isolation integrity, reducing noise in analog signals (e.g., temperature/pressure sensors).
• Low-Ripple Output for Sensitive Loads: ≤50mVpp ripple + tight voltage regulation (±0.6% line, ±1.0% load)—delivers stable power to AC500 signal processing modules (e.g., DSPB112) and precision sensors; eliminates data drift in critical applications (e.g., remote water level monitoring, solar inverter control).
• Industrial-Grade Durability: Aluminum alloy housing + -30℃~+70℃ operating range—withstands extreme temperatures in off-grid locations (arctic telecom towers, desert solar farms); condensing humidity tolerance avoids performance issues in damp battery rooms; 20g shock resistance survives transportation/installation impacts.
• Comprehensive DC-Specific Protection: Reverse polarity protection (critical for battery systems) + overload/short-circuit/over-temperature safeguards—covers common DC system faults (e.g., incorrect battery wiring, shorted field sensors); isolation monitoring via LED alerts maintenance teams to insulation degradation before safety risks arise.
• Seamless AC500 Integration: Regulated output optimized for AC500 PLCs and mid-density I/O modules (e.g., DSMB340 analog I/O); standard terminal blocks accept 16AWG~14AWG wires for DC connections; compatible with ABB Automation Builder for system configuration, ensuring plug-and-play deployment in DC automation networks.
• Energy Efficiency for Battery Systems: 91% peak efficiency (at 50%~75% load)—minimizes energy draw from batteries or solar arrays, extending run time in off-grid scenarios (e.g., 10% longer battery life vs. 85% efficiency alternatives); passive cooling (no fans) reduces energy consumption and failure points.

3. Application Fields

• Telecom & Remote Sites: Battery-Backed Power:
  • Cellular Base Stations: Converts 48V DC battery power to 24V DC for AC500 PLCs (site monitoring)—100W output supplies 1× PLC + 4× temperature/humidity sensors + 2× power supply status monitors; 2kV isolation prevents ground loops between battery banks and PLCs; -30℃ operating range suits remote arctic/alpine sites.
  • Off-Grid Weather Stations: Powers AC500 micro PLCs for environmental monitoring—24V output supplies 1× PLC + 6× sensors (wind speed, rainfall, air quality) + 1× satellite communication module; wide input range (16.8V~31.2V) tolerates solar battery discharge; low ripple ensures sensor data accuracy (±0.5% error).
• Renewable Energy: DC-Side Power:
  • Solar PV Microgrids (100kW~500kW): Converts 48V DC string inverter power to 24V DC for AC500 PLCs (array monitoring)—100W output powers 1× PLC + 8× current sensors (panel output) + 2× voltage sensors (DC bus); 91% efficiency reduces energy loss in solar systems; isolation blocks noise from inverter switching.
  • Small Wind Turbines (5kW~20kW): Converts 24V DC turbine generator power to 12V DC for legacy sensors + 24V DC for AC500 PLCs (turbine control)—dual-output variant eliminates separate supplies; vibration resistance (1g) withstands turbine motion; over-temperature protection avoids shutdowns in hot nacelles.
• Industrial Off-Grid Systems: DC Mains Power:
  • Remote Mining Camps: Powers AC500 PLCs for water pump control—24V output supplies 1× PLC + 3× flow sensors + 2× pump relay outputs; 2kV isolation prevents ground loops between generator DC mains and PLCs; condensing humidity tolerance suits damp mine environments.
  • Marine Automation: Converts 24V DC ship battery power to 24V DC for AC500 PLCs (cargo handling control)—100W output powers 1× PLC + 5× limit switches + 2× actuator controllers; shock resistance (20g) survives rough seas; flame-retardant housing meets marine safety standards.
• Transportation: Mobile DC Systems:
  • Railway Signaling: Converts 48V DC railway battery power to 24V DC for AC500 PLCs (signal control)—output powers 1× PLC + 4× track sensors + 2× signal light controllers; 2kV isolation prevents ground loops between train rails and signaling systems; wide input range tolerates voltage drops during train passage.
  • Electric Vehicle Charging Stations: Powers AC500 PLCs for charger control—24V output supplies 1× PLC + 3× current sensors + 1× HMI display; DC input from charger rectifiers avoids AC-to-DC conversion steps; low ripple ensures accurate current measurement (±1% error) for billing.

The structure and details of the product：

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