Product Short Description
ABB CMA121
DC Power Supply Module – Comprehensive Datasheet
DC Power Supply Module – Comprehensive Datasheet
Technical Specifications
Manufacturer: ABB
Part Number: CMA121
Type: DIN-rail DC power supply
Input Voltage Range: 100 – 240 V AC, 50/60 Hz
Output Voltage: 24 V DC
Output Current: 12.5 A continuous
Output Power: 300 W
Ripple & Noise: < 100 mV p-p
Line/Load Regulation: ±1 % from no load to full load
Efficiency: > 90 % @ 230 V AC, 75 % load
Hold-up Time: ≥ 20 ms @ 24 V DC, 12.5 A
Manufacturer: ABB
Part Number: CMA121
Type: DIN-rail DC power supply
Input Voltage Range: 100 – 240 V AC, 50/60 Hz
Output Voltage: 24 V DC
Output Current: 12.5 A continuous
Output Power: 300 W
Ripple & Noise: < 100 mV p-p
Line/Load Regulation: ±1 % from no load to full load
Efficiency: > 90 % @ 230 V AC, 75 % load
Hold-up Time: ≥ 20 ms @ 24 V DC, 12.5 A
Description
Protection Functions
• Overload: 105 – 150 % auto-recovery
• Short-circuit: Continuous, auto-recovery
• Overvoltage: 28 – 33 V DC, shutdown
Isolation: 3 kV AC input-to-output, 500 V DC output-to-ground
Operating Temperature: –25 °C to +70 °C
Storage Temperature: –40 °C to +85 °C
Relative Humidity: 5 % – 95 % non-condensing
Protection Class: IP20
Dimensions: 124 mm W × 124 mm H × 102 mm D
Weight: 0.9 kg
Approvals: CE, UL 508, IEC 60950-1, SEMI F47
• Overload: 105 – 150 % auto-recovery
• Short-circuit: Continuous, auto-recovery
• Overvoltage: 28 – 33 V DC, shutdown
Isolation: 3 kV AC input-to-output, 500 V DC output-to-ground
Operating Temperature: –25 °C to +70 °C
Storage Temperature: –40 °C to +85 °C
Relative Humidity: 5 % – 95 % non-condensing
Protection Class: IP20
Dimensions: 124 mm W × 124 mm H × 102 mm D
Weight: 0.9 kg
Approvals: CE, UL 508, IEC 60950-1, SEMI F47
Functional Highlights
Compact switch-mode design with active power factor correction
Wide-range universal AC input eliminates need for tap selection
Convection cooling – no fan, silent operation
Front-panel LED indicators for DC OK, overload, and fault states
Parallel sharing capability allows N+1 redundancy or higher current
DIN-rail mountable with direct grounding via metal base plate
Remote sense terminals compensate for up to 0.5 V cable drop
Compact switch-mode design with active power factor correction
Wide-range universal AC input eliminates need for tap selection
Convection cooling – no fan, silent operation
Front-panel LED indicators for DC OK, overload, and fault states
Parallel sharing capability allows N+1 redundancy or higher current
DIN-rail mountable with direct grounding via metal base plate
Remote sense terminals compensate for up to 0.5 V cable drop
Application Scenarios
Process automation – powering 24 V DC fieldbus power rails and I/O modules in petrochemical plants
Machine building – supplying PLC, HMI, sensors, actuators on packaging lines
Energy & utilities – redundant DC bus for SCADA RTUs and protection relays in substations
Transportation – stable DC feed for signaling interlocking and track-side control cabinets
Building automation – 24 V DC distribution for HVAC controllers, access control, and fire safety systems
Process automation – powering 24 V DC fieldbus power rails and I/O modules in petrochemical plants
Machine building – supplying PLC, HMI, sensors, actuators on packaging lines
Energy & utilities – redundant DC bus for SCADA RTUs and protection relays in substations
Transportation – stable DC feed for signaling interlocking and track-side control cabinets
Building automation – 24 V DC distribution for HVAC controllers, access control, and fire safety systems
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