PULS CPS20.121 DIN Rail Power Supply, 12V 30A 360W, 100-240VAC, Class I Div 2, Dimension C-Series

The PULS CPS20.121 is a 12V DC, 30A, 360W DIN rail power supply from the PULS DIMENSION C-Series. It accepts a 100-240V AC wide-range input with active power factor correction, reaches up to 92.6% efficiency, and fits a 65mm-wide footprint on a 35mm DIN rail. Output is adjustable from 12 to 15V DC (27A, 405W at 15V), and the unit delivers full rated power from -25°C to +60°C with no fan required.

A typical 120A peak current for 15ms (about four times nominal) trips downstream fuses and circuit breakers quickly on a faulted branch, protecting adjacent 12V circuits from voltage loss. Hazardous location approvals (Class I, Division 2 and ATEX/IECEx Zone 2), marine approvals, and a DC-OK relay contact make the CPS20.121 a strong fit for demanding 12V control and instrumentation panels.

Key Features

• 12V DC, 30A, 360W output, adjustable 12-15V DC via front potentiometer (factory set to 12.0V)
• 100-240V AC wide-range input with active PFC (power factor 0.99 at 120V AC)
• Up to 92.6% efficiency with excellent partial load efficiency (91.6% average at 230V AC)
• 120A peak for 15ms for fast fuse and breaker tripping on faulty output branches
• Safe Hiccup^PLUS overload mode with automatic restart once the overload clears
• Active inrush current limitation, 13A peak maximum
• Full power from -25°C to +60°C, operational to +70°C with derating
• DC-OK relay contact and green DC-OK LED for remote output monitoring
• Single Use / Parallel Use jumper for load sharing and redundant configurations
• Only 65mm wide to save panel space
• Class I Div 2, ATEX, IECEx, DNV and ABS approvals
• 3-year PULS warranty

Specifications

Applications

The CPS20.121 powers 12V DC loads in industrial control, process control, and measurement equipment, including 12V solenoid valves, contactors, and pneumatic modules whose pick-up coils draw several times their steady-state current. Its peak current reserve and large internal output capacitance (5,600µF) keep 12V branches stable while a faulted branch breaker trips, which matters in panels where PLC ride-through is limited to roughly 10ms.

The unit is also approved for charging 12V lead-acid and maintenance-free batteries when the output is set precisely to the battery's end-of-charge voltage, with a 40A or 50A breaker or blocking diode between supply and battery. With Class I Div 2, ATEX/IECEx Zone 2, DNV, and ABS approvals, it suits oil and gas skids, marine and offshore panels, and hazardous-location instrumentation (Zone 2 installations require an IP54 enclosure meeting EN 60079-0).

Parallel and Redundant Operation

Move the front jumper to "Parallel Use" to share load between multiple CPS20.121 units for higher output power or N+1 redundancy. For true redundancy that isolates a failed unit, PULS recommends pairing the CPS20.121 with a YR80.242 dual-input redundancy module (preferred) or YR40.245 single-channel redundancy modules, and monitoring each supply through its DC-OK relay contact.

Compatible Accessories

• ZM2.WALL: Wall mounting bracket for flat-surface mounting without a DIN rail
• ZM13.SIDE: Side mounting bracket, with or without DIN rail
• YR80.242: Redundancy module, 2 x 40A inputs, 80A output
• YR40.245: Redundancy module, 40A single channel with plug connector output

Installation Notes

• Mount with input terminals on the bottom; other orientations require output current derating.
• Minimum clearances: 40mm top, 20mm bottom, 5mm left and right (15mm next to a heat source).
• Class of Protection I: a PE (protective earth) connection is required.
• If external input protection is used, choose a breaker of at least 10A, B- or C-characteristic, to avoid nuisance tripping.