QUINT-PS/1AC/24DC/20 is the 3rd-generation flagship single-phase AC-to-24VDC switched-mode industrial power supply under Phoenix Contact’s QUINT POWER series. Rated output: 24 VDC / 20 A (480 W), released for mass production in 2008 with order code 2866776 as part of Phoenix Contact’s premium power portfolio. It features proprietary dual patented technologies: SFB Selective Fuse Breaking and POWER BOOST power redundancy.
A standard power source for industrial automation and critical control systems, it accepts wide-range universal AC/DC input and holds IEC, UL, CE, GS and other international approvals, with MTBF over 500,000 hours. Designed for high system fault tolerance, pre-fault warning and stable operation under harsh conditions, it is widely deployed at facilities requiring uninterrupted power supply.Housed in galvanized steel enclosure for DIN rail snap mounting, net weight 1.7 kg and IP20 protection rating, this high-power 24V DC supply is engineered exclusively for single-phase mains networks.
DOCUMENT DOWNLOAD
Phoenix QUINT-PS/1AC/24DC/20 Switching Power Supply.pdf
Phoenix QUINT-PS/1AC/24DC/20.pdf
Product Advantages
- Exclusive SFB Selective Fuse Breaking TechnologyDelivers instantaneous 120A short-circuit pulse (6× rated 20A) lasting 12ms to reliably trip downstream Type B miniature circuit breakers. Only the faulty branch is disconnected while healthy loads remain powered, eliminating full-system shutdown caused by single-point short-circuit and cutting production downtime & maintenance expenses.
- POWER BOOST Static Power ReserveSustained 26A continuous output (130% rating, 625W) below 40°C ambient. Easily handles inrush startup current of capacitive loads, servo drives and high-power contactors without extra power supply expansion.
- Full-chain Pre-fault Diagnostic AlarmReal-time monitoring of output voltage & current; equipped with DC OK / BOOST LED indicators plus dual alarm outputs (active 24VDC signal + passive relay dry contact). Pre-alarm messages are sent to PLC for predictive maintenance and unplanned outage prevention.
- Wide Grid Compatibility & Superior EMC ImmunityAC input: 85~264VAC (nominal 100~240VAC); DC input range:90~350VDC; withstands transient 300VAC overvoltage for unstable global mains. >20ms holdup time bridges brief mains dips.Full industrial EMC compliance per EN61000: 15kV air / 8kV contact ESD, 4kV surge immunity, suitable for high-interference cabinets near inverters and large motors.
- High Reliability & Wide Operating TemperatureOperating range: -25℃ ~70℃; linear power derating at 2.5%/℃ above 60°C (power derate instead of shutdown). Storage temperature: -40~85℃, ideal for outdoor and high-temperature metallurgy cabinets.＞93% efficiency at full load under 230VAC; no-load power ≤10W for low heat & energy saving. 4kVAC input-output isolation with SELV safety rating and Class I protective earth structure against electric shock.
- Flexible Capacity Expansion & MountingUp to 5 units in parallel for redundant capacity expansion or series connection for higher output voltage. Two DIN rail mounting options available: standard 125mm depth upright installation or 90° rotated compact 93mm layout to save cabinet space.
Electrical & Mechanical Specifications
1. Input Ratings
Nominal AC Input: 100~240VAC, 45~65HzWide AC Operating Range: 85~264VAC, transient withstand up to 300VACDC Alternative Input: 90~350VDC (0Hz)Nominal Input Current: ~2.3A @230VAC; ~5.1A @120VACInternal Input Fuse: 12A slow-blow fuse; recommended upstream MCB: B10A / B16AInrush Current: <20A, I²t <3.2A·sPE Leakage Current: <3.5mA
2. Output Ratings
Nominal Output: 24VDC±1%, adjustable 18~29.5VDC via trim pot (full rated power retained above 24V)Current Ratings:
- Normal: 20A full rated across -25℃~+70℃
- BOOST continuous: 26A permanent at ≤40℃
- SFB short-circuit pulse: 120A /12msRipple & Regulation: <80mVpp ripple; dynamic load regulation <2%, static regulation <1%; short-circuit clamp at 35VDC with reverse polarity protection up to 35VDC.
3. Status Indicators & Signals
DC OK (Power Good)Green LED steady-on when output ≥21.6V (0.9×24V); flashes below threshold. Active 24VDC sourcing output & isolated relay contact close accordingly.
BOOST (Overload Warning)Yellow LED lit when output >20A; off under normal load, active BOOST signal drops to low level.
Two alarm output types:① Active 24VDC signal (short-circuit withstand ≤1A);② Isolated passive relay contact (≤30V AC/DC, 1A rating). Multiple supplies’ alarm signals can be wired in series for common alarm terminal.
4. Mechanical Dimension & Termination
Standard Mount: W90 × H130 × D125 mm90° Rotated Compact Mount: W122 × H130 × D93 mmScrew Terminal: Accept solid wire 0.2~6mm² / stranded wire 0.2~4mm²; tightening torque:0.5~0.6Nm, stripping length:7mmMounting: Snap-on DIN rail per EN60715; optional accessories:QUINT-PS-ADAPTERS7/1 (S7-300 rail adapter, PN:2938196), UWA182/52 wall-mount bracket (PN:2938235)
Application Fields
Heavy Industry AutomationPower supply for PLC/DCS systems, inverter control circuits and sensor arrays in metallurgical & chemical production lines; SFB technology prevents full-line shutdown triggered by single-point short circuit.
Rail Transit & Tunnel ElectromechanicsControl cabinets for tunnel blowers and subway turnstiles; wide input range adapts fluctuating mains, and >20ms hold-up time maintains continuous supply during brief mains dropouts.
New Energy SectorPV combiner cabinets and BESS control enclosures; wide ambient tolerance of -25℃~70℃ fits outdoor cabinet temperature variation.
Intelligent Machinery & Machine ToolsCNC machine tools, injection molding machines and robot control cabinets; BOOST power margin covers high inrush startup current of servo drives.
Building & Municipal ProjectsCentralized power for fire control panels, pump station PLC and access control security systems.
Redundant Power Architecture100% redundant power system configured with ≥2 units plus QUINT-DIODE/40 (PN:2938963) anti-reverse feed diodes, deployed for SIS safety instrumented systems and critical server DC feeding.
FAQ
Q1: DC OK green LED flashes after power-up, what’s the issue?A: Flashing DC OK indicates output below 21.6V (0.9×rated). Three typical causes:① Short-circuit or heavy overload on downstream loads; disconnect all loads for no-load test – normal no-load confirms field wiring fault;② Input AC below 85VAC due to low mains voltage;③ Internal power supply failure; return to factory for repair if flashing persists under no load.
Q2: BOOST yellow lamp stays on, is long-term continuous operation allowed?A: Continuous 20~26A permitted below 40℃ ambient; only temporary operation above 40℃. Output derates progressively with rising temperature under permanent heavy load. Upgrade power supply or split loads as recommended.
Q3: Can two QUINT units of different ratings run in parallel?A: Not recommended. Only identical QUINT-PS/1AC/24DC/20 of same batch can be paralleled. Dissimilar output impedance between mismatched ratings (e.g.10A+20A) causes uneven current sharing, leading to overheating and burnout of lower-rated unit.
Q4: B10A or B16A MCB for upstream protection?A: B10A for standard loads; B16A for high-inrush capacitive/motor loads. Both Type B breakers are officially approved per datasheet.
Q5: Full 20A output permissible at 65℃ ambient?A: Output derates 2.5% per ℃ above 60℃; total 12.5% derating at 65℃ → max permissible output = 17.5A. Full 20A forbidden; reduce load or improve cabinet cooling.
Q6: Will reversed 30VDC damage the unit?A: Unit withstands reverse voltage up to 35VDC; 30VDC causes no damage. Reverse over 35VDC breaks internal protection circuit and destroys the supply.
Q7: Is special circuit breaker required for SFB function?A: No, standard Type B miniature circuit breakers suffice. SFB’s 6×rated short pulse is engineered to match standard B-curve tripping characteristics without custom fuses.
Q8: Can two 380V phases (L1/L2) connect directly to input terminals?A: Prohibited! Measured 380V exceeds maximum 264VAC input limit. Use single phase + neutral (220V) from three-phase mains only.
Q9: Definition of MTBF＞500,000h & warranty term?A: 500,000hrs ≈57 years theoretical service life calculated per IEC61709. Standard Phoenix Contact factory warranty: 5 years; typical field service life exceeds 10 years under regular industrial conditions.
Q10: Standby no-load power consumption for long-term energization?A: Max no-load loss:10W; daily power consumption ~0.24kWh. Low standby draw allows permanent powered without shutdown.
Q11: Accessory for wall mounting without DIN rail?A: Original wall bracket UWA182/52 (Order No.2938235) for cabinet wall installation.
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