Phoenix Contact 2902991 UNO-PS/1AC/24DC/30W – 24 V DC, 1.25 A Power Supply
The Phoenix Contact 2902991 (UNO-PS/1AC/24DC/30W) is an ultra-compact, single-phase, primary-switched DIN rail power supply from the Phoenix Contact UNO POWER range. It delivers 24 V DC at 1.25 A (30 W) in a housing only 22.5 mm wide, the narrowest in the UNO range, designed for small control boxes and installation distribution boards. With no-load losses under 0.3 W, very long mains buffering and NEC Class 2 approval, it is a simple and reliable 24 V supply for small loads.
What the Part Number Means
- 2902991 – Phoenix Contact order number
- UNO-PS – UNO POWER power supply
- 1AC – Single-phase AC input
- 24DC – 24 V DC output
- 30W – 30 W output power (1.25 A at 24 V)
Key Features
- Ultra-compact: only 22.5 mm wide, 90 mm high and 84 mm deep
- Low losses: no-load power consumption under 0.3 W
- Very long mains buffering at 230 V AC: over 115 ms
- NEC Class 2: UL 1310 approval for limited-energy circuits
- Short-circuit proof: HICCUP output characteristic
- High reliability: MTBF over 1,158,000 hours at 40 °C
Key Specifications (Phoenix Contact 2902991 Datasheet)
Input
- Nominal input voltage: 100–240 V AC
- Input voltage range: 85–264 V AC, 50–60 Hz
- Input current: typ. 0.8 A at 100 V AC / typ. 0.4 A at 240 V AC
- Inrush current: <30 A (typical)
- Mains buffering: >25 ms at 120 V AC / >115 ms at 230 V AC
- Internal input fuse: 2 A, slow-blow
- Recommended circuit breaker: 6–16 A (characteristic B, C, D or K)
Output
- Nominal output voltage: 24 V DC
- Nominal output current: 1.25 A (-25 °C to +55 °C)
- Output power: 30 W
- Efficiency: typ. 88% at 230 V AC / typ. 87% at 120 V AC
- Residual ripple: <60 mVpp
- Overvoltage protection: ≤35 V DC
- Control deviation: <1% (static load 10–90%) / <2% (dynamic)
- Short-circuit proof (HICCUP characteristic)
- No-load power consumption: <0.3 W
- Parallel connection for redundancy or higher capacity, and series connection, both possible
Signalling
- Status LED
General Data
- Connection: screw connection (M3), 0.2–2.5 mm² (AWG 24–14)
- Mounting: DIN rail NS 35, horizontal; 0 mm clearance left and right, 30 mm top and bottom
- Housing: polycarbonate, UL 94 V0
- Degree of protection: IP20
- Protection class: II (in closed control cabinet)
- MTBF (IEC 61709, SN 29500): >1,158,000 h at 40 °C
- Ambient temperature (operation): -25 °C to +70 °C, derating 2.5%/K above +55 °C
- Start-up: type-tested at -40 °C
- Storage temperature: -40 °C to +85 °C
- Dimensions (W × H × D): 22.5 × 90 × 84 mm
- Weight: approx. 147 g
Approvals and Standards
- UL 508, UL 60950-1, UL 1310 (NEC Class 2)
- Class I, Division 2, Groups A–D, T4 (hazardous locations)
- CSA C22.2 No. 213
- IECEE CB Scheme, EAC
- SEMI F47
- IEC 62368-1 (SELV), EN 60204-1 (PELV), EN 61558-2-16
- EN 55011 Class B (emissions)
Typical Applications
- 24 V DC supply in small control boxes and distribution boards
- Relays, sensors, small displays and signal circuits
- Building automation and HVAC controls
- Direct replacement of 2902991 units in existing installations
Buy the Phoenix Contact 2902991 from Atlantech Drives
Atlantech Drives supplies the Phoenix Contact 2902991 UNO-PS/1AC/24DC/30W with fast worldwide shipping and a 12-month warranty. Our experienced sales team can also quote other UNO, TRIO and QUINT power supplies. Request a quote today for price and availability.
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Manufacturer website: Phoenix Contact
