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ABB DSSR121 Power Supply Unit 

1. Key Parameters

• Product Model: DSSR121
• Product Series: ABB AC500 Series Industrial Mid-to-High Power Supply Units (150W Redundant Distribution)
• Core Function: Converts 100V~240V AC mains to regulated 24V DC (or 48V DC optional) for AC500 PLCs and large-scale automation components; supports parallel operation for N+1 redundancy; provides comprehensive protection (overload/overvoltage/short-circuit/over-temperature/overpower); enables remote monitoring via optional interface; delivers low-ripple output for sensitive analog devices; supports DIN rail mounting for industrial cabinets
• Electrical Specifications:

  Parameter	Details	Performance Metrics
  Input Characteristics	- Input Voltage Range: 100V~240V AC (50Hz/60Hz, auto-adaptive) - Input Current: Max 1.5A (100V AC); Max 0.75A (240V AC) - Input Protection: Surge protection (IEC 61000-4-5, 2.5kV); Brownout tolerance (75V AC~100V AC, 5s hold-up) - Power Factor Correction (PFC): Active PFC (PF ≥0.95 at full load)	Auto-adaptive input works with global mains (no manual switching), ideal for multi-region industrial projects; 2.5kV surge protection withstands severe transients (lightning, VFD switching); active PFC minimizes harmonic distortion, complying with strict industrial power standards (EN 61000-3-2 Class A)
  Output Characteristics	- Output Voltage: 24V DC ±1.5% (regulated; optional 48V DC ±1.5% variant) - Output Current: Max 6.25A (24V DC model); Max 3.125A (48V DC model) - Output Power: 150W (24V DC × 6.25A; 48V DC × 3.125A) - Voltage Regulation: ±0.5% (line regulation); ±0.8% (load regulation) - Ripple & Noise: ≤40mVpp (20MHz bandwidth)	150W output powers large AC500 systems (1× DSPC172 processor + 10× DSMB I/O modules + 12× sensors/actuators); ≤40mVpp ripple ensures precision operation of analog sensors (e.g., 4-20mA pressure/temperature transmitters); tight regulation avoids PLC logic errors or signal drift in critical processes

• Mechanical & Environmental Specifications:

  Parameter	Details	Performance Metrics
  Mechanical Design	- Dimensions: 100mm (W) × 120mm (H) × 140mm (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 panel - Weight: Approximately 750g - Indicators: 1× AC input LED (green = active); 1× DC output LED (green = normal, red = fault); 1× redundancy LED (blue = parallel mode active); 1× overload LED (yellow = overload)	Aluminum alloy housing enhances passive heat dissipation for 150W output; 4-color LEDs enable precise status diagnosis (e.g., blue = redundancy active, yellow = overload); tool-less mounting simplifies installation in dense 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, 1.2g acceleration (IEC 60068-2-6) - Shock Resistance: 25g (11ms half-sine, IEC 60068-2-27) - EMC Compliance: EN 61000-6-2 (immunity: Level 4); EN 61000-6-3 (emission: Class B)	-30℃~+70℃ range suits extreme industrial environments (arctic substations, desert factories); condensing humidity tolerance eliminates dehumidifiers in damp areas (e.g., water treatment plants); 1.2g vibration resistance withstands pump/turbine-induced shocks

• Protection & Compliance Specifications:

  Parameter	Details	Performance Metrics
  Protection Features	- Overload Protection: 110%~160% load (hiccup mode, auto-recovery) - Overvoltage Protection: 28.8V DC ±3% (24V model); 57.6V DC ±3% (48V model) (latching, manual reset) - Short-Circuit Protection: Current limiting (≤7.5A for 24V; ≤3.75A for 48V) (hiccup mode) - Over-Temperature Protection: 85℃ ±5℃ (thermal shutdown, auto-recovery at 70℃) - Overpower Protection: 165W (10% overload cutoff, latching)	Multi-layer protection covers all critical faults (e.g., shorted actuators, voltage spikes); latching overpower/overvoltage protection prevents repeated damage to expensive PLC hardware; hiccup mode auto-recovers from temporary issues (e.g., sensor inrush current)
  Redundancy & Monitoring	- Parallel Operation: Supports up to 4 units in parallel (N+1 redundancy) - Current Sharing: ±5% current balance between parallel units - Optional Interface: RS-485 Modbus RTU (for remote monitoring of voltage, current, temperature, fault status)	N+1 redundancy ensures 99.999% power availability (critical for continuous processes); current sharing prevents overload of individual units; Modbus RTU enables predictive maintenance via SCADA/HMI
  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

• 150W High-Capacity & Redundancy: 150W output + parallel N+1 redundancy (up to 4 units)—powers large AC500 systems (e.g., 1× DSPC172 + 10× DSMB modules) and supports mission-critical processes (e.g., chemical batch production) where power interruption causes costly downtime; current sharing (±5% balance) ensures even load distribution across parallel units, extending service life.
• Ultra-Precise Low-Ripple Output: ≤40mVpp ripple + ±0.5% line/±0.8% load regulation—delivers stable power to sensitive analog devices (e.g., 4-20mA pressure transmitters, precision encoders) and AC500 signal processing modules (e.g., DSPB112); eliminates data drift or false triggers in high-precision applications (e.g., semiconductor wafer handling, robotic assembly with ±0.02mm accuracy).
• Global Compatibility & Active PFC: 100V~240V AC auto-adaptive input + PF ≥0.95—works with global mains voltages and minimizes harmonic distortion, complying with strict industrial power quality standards (e.g., EN 61000-3-2 Class A); ideal for factory floors with shared power grids, avoiding interference with other equipment.
• Industrial-Grade Durability: Aluminum alloy housing + -30℃~+70℃ operating range—withstands extreme temperatures (arctic cold, desert heat) and harsh conditions (dust, moisture, vibration) that damage low-grade supplies; condensing humidity tolerance (up to 50℃) eliminates dehumidifiers in damp environments (e.g., water treatment plants, coastal substations).
• Remote Monitoring & Predictive Maintenance: Optional RS-485 Modbus RTU interface—enables remote tracking of input voltage, output current, temperature, and fault status via SCADA or ABB HMI (e.g., CP600); supports predictive alerts (e.g., rising temperature, declining efficiency) to schedule maintenance before unexpected shutdowns.
• Comprehensive Fault Resilience: Overload/overvoltage/short-circuit/over-temperature/overpower protection—covers all common industrial faults (e.g., shorted actuator wiring, grid transients); latching protection for critical faults requires manual reset, ensuring safe operation; 25g shock resistance survives accidental impacts during cabinet maintenance.
• Seamless AC500 Integration: Regulated 24V/48V output optimized for AC500 PLCs and high-density I/O modules (e.g., DSMB340 analog I/O, DSRF182 I/O frames); standard terminal blocks accept 14AWG~10AWG wires for high-current connections; auto-detected by ABB Automation Builder for simplified system configuration.

3. Application Fields

• Manufacturing Automation: Large-Scale Lines:
  • Automotive Assembly Plants: Powers AC500 Premium PLCs (DSPC172) for robotic welding lines—24V 6.25A output supplies 1× PLC + 8× DSMB178 digital I/O modules (robot position sensors) + 4× DSMB340 analog I/O modules (welding current feedback); parallel redundancy (2 units) ensures no downtime during power supply maintenance; low ripple ensures consistent weld quality (±1% current accuracy).
  • Electronics Semiconductor Fabs: Supplies 24V DC to AC500 systems for wafer etching equipment—150W output powers 1× PLC + 6× precision temperature sensors + 3× pressure transmitters; ≤40mVpp ripple avoids etching defects (e.g., uneven wafer coating); active PFC complies with fab power quality standards, preventing interference with sensitive lithography machines.
• Process Control: Main System Power:
  • Chemical Complexes: Powers AC500 DCS main racks for reactor control—24V output supplies 1× DSPC172 processor + 10× DSMB I/O modules + 2× DSMX SIL 3 safety modules; N+1 redundancy (2 units) ensures 99.999% availability for continuous batch processes; -30℃~+70℃ range suits unconditioned control rooms near reactors.
  • Oil Refineries: Provides 48V DC to AC500 PLCs for pipeline main pump control—150W output powers 1× PLC + 4× flow sensors + 2× high-torque valve actuators; aluminum housing resists oil mist and dust; vibration resistance (1.2g) withstands pump-induced shocks, ensuring uninterrupted oil flow.
• Energy & Utilities: Primary Controls:
  • EHV Substations (500kV+): Powers AC500 PLCs for primary switchgear control—24V output supplies 1× DSPC172 + 6× DSMB I/O modules (breaker status sensors) + 2× communication modules (IEC 61850); parallel redundancy (2 units) ensures no power interruption for substation safety systems; -30℃ operating range suits outdoor substation cabinets.
  • Solar PV Plants (1GW+): Supplies 24V DC to AC500 PLCs for inverter cluster control—150W output powers 1× PLC + 8× current sensors (string output) + 4× voltage sensors (DC bus); optional Modbus RTU enables remote monitoring via plant SCADA; passive cooling avoids fan clogging from desert dust.
• Water & Wastewater: Large Treatment Plants:
  • Municipal Water Plants: Powers AC500 PLCs for multi-stage filtration control—24V output supplies 1× PLC + 10× pressure sensors (filter clogging) + 6× solenoid valves (backwash cycles); condensing humidity tolerance eliminates dehumidifiers in damp pump stations; over-temperature protection withstands summer cabinet heat, ensuring continuous water treatment.

The structure and details of the product：

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